hybridfree/eevblog-posts huggingface dataset:
Ali Express - Page 1
Forum section: electronics / beginners

author: piyumal
author_rank: Newbie
timestamp: September 27, 2021, 07:11:16 am
content: I have ordered the item and paid on Ali Express. After few days order was closed and says " We had to close this order due to account security concerns. Please place an order again later, or remove the coupon and try again".What is the meaning of this? I am new to this.And also there are button called "Extend Processing Time". Why do I need to extend the processing time? Is it compulsory to Extend the processing time by my end?Please explain clearly !!

author: retiredfeline
author_rank: Frequent Contributor
timestamp: September 27, 2021, 07:18:32 am
content: Never happened to me but they thought your credit card or Paypal account was suspect. Just try again.Sellers have to ship within a given time. If they don't the order gets cancelled. You can choose to give them more time to ship. Again, I never had to use this, they usually ship within a day or two. Maybe a few days if there is a holiday.

author: ataradov
author_rank: Super Contributor
timestamp: September 27, 2021, 07:37:53 am
content: Most likely it is one of the sellers that does not actually have the item at this time, so they came up with a bogus reason to cancel the order. Just get your money back and order the same stuff from another seller.Strange things like this happen occasionally, it is not worth your time to overthink it.

author: Jwillis
author_rank: Super Contributor
timestamp: September 27, 2021, 05:00:42 pm
content: Aliexpress bring many many sellers together . This can create a logistic nightmare in some cases . Extended processing usually means the item needs to be acquired from some warehouse or supplier first before it can be shipped . This takes time . In some cases the item hasn't been produced yet . This happened with an oscilloscope I ordered because of manufacturer backlog .

author: ledtester
author_rank: Super Contributor
timestamp: September 29, 2021, 02:17:44 am
content: Quote from: ataradov on September 27, 2021, 07:37:53 amNote that many alix vendors are just drop shippers. They don't actually carry them item - they just sell them on behalf of another vendor who does the actual shipping. That's why you see the exact same ads for an item across multiple vendors. The only thing that's different is the price and shipping options/cost.In fact, a lot of alix items have the keyword "dropshipping" in the item's title.
Aliexpress Cob Meteor Shower - Page 1
Forum section: electronics / beginners

author: gabi68
author_rank: Newbie
timestamp: January 12, 2024, 09:50:21 pm
content: Hi to all,I am waiting for 10 pcs (58mm) and 10 pcs (40mm) to be delivered. Watching to video from Aliexpress it is look like 4 for modes can be used to power on and off each device.I want to use that COB lights to build some stars (5 long ones and 5 short ones).Link to item:https://a.aliexpress.com/_ExTjtyDWhat kind of circuit should I use to cycle power in order to change the modes?Microcontroller, 555, ....Thank you

author: liaifat85
author_rank: Regular Contributor
timestamp: January 13, 2024, 06:54:39 am
content: You can use any microcontroller. You can find a similar work with source code here:This is done with ESP32.

author: gabi68
author_rank: Newbie
timestamp: January 13, 2024, 05:11:22 pm
content: Thank you for your reply, but this not what I want. I only want to cut the power automatically and repower to change to the next mode for let say 5 seconds in a loop. Any ideea?TIA

author: sleemanj
author_rank: Super Contributor
timestamp: January 13, 2024, 10:42:03 pm
content: Just use any arduino and hang a suitable mosfet or relay on pne of the pinsCode:#define LED_MOSFET_OR_RELAY_PIN 8void setup(){pinMode(LED_MOSFET_OR_RELAY_PIN, OUTPUT);}void loop(){digitalWrite(LED_MOSFET_OR_RELAY_PIN, false);delay(100);digitalWrite(LED_MOSFET_OR_RELAY_PIN, true);delay(5000);}
Aligning signals on Rigol MSO5074 - Page 1
Forum section: electronics / beginners

author: typoknig
author_rank: Regular Contributor
timestamp: February 23, 2021, 01:11:59 am
content: I have a Rigol MSO5074. It is my first "real" scope and I've mostly just muddled my way through using it for what I've needed thus far. Today I need to compare two signals that are not aligned. I have captured both of them in a wave form, but I don't see a way to offset the horizontal position which would allow me to do a detailed comparison. Dave made the video below about aligning signals using an "OR" trigger, but I don't have an "OR" trigger. Reading the manual the closest it seems I have to an "OR" trigger is the "Pattern" trigger which the manual indicates behaves as an "AND". I've tried several combos of patterns, but nothing results in aligned signals.

author: typoknig
author_rank: Regular Contributor
timestamp: February 23, 2021, 03:02:50 am
content: I was able to use capture both waves A and B then create a REF of wave A, load wave B, then turn on the REF to do the comparison. Maybe there are cleaner ways, but this got the job done.
All 4 Astron pass transistors failed in same way...did I test incorrectly? - Page 1
Forum section: electronics / beginners

author: K5_489
author_rank: Regular Contributor
timestamp: September 29, 2024, 05:15:44 am
content: I've had an Astron VM-35M with no output sitting in my "projects to learn troubleshooting the magic parts on" pile for years, and finally started digging in to said pile tonight. I've read that the pass transistors are a common fail point on these supplies, and since they're easy to get to and remove, I started there.I pulled the four NPN 2N3771 TO-3 transistors from the back panel, and went through the checks, using my multimeter set to diode mode. Positive lead to the first point, negative to the second. So base to emitter would be positive on base, negative on emitter. All 4 tested exactly the same, with voltages differing by only a few hundredths one way or the other -Base to Emitter - 0.481Base to Collector - 0.477Emitter to Base - 2.845, with voltage slowly creeping upEmitter to Collector - 2.466, with voltage slowly creeping downCollector to Base - OLCollector to Emitter - OLMy checklist says the E-B & E-C test should show OL as well, so they appear to be bad. Is this a case of since they're all in parallel, when one goes it tends to overload the other 3, and they just domino fail? Or did I test these in an incorrect manner?

author: madires
author_rank: Super Contributor
timestamp: September 29, 2024, 11:55:39 am
content: No, checking the pn junctions in diode mode and looking for shorts is the standard method. But be aware that some BJTs have a base-emitter resistor and/or a flyback diode integrated (there are more special types). And yes, paralleled BJTs often fail together. Happens also in audio amps, for example.
All pass filter simulation question - Page 1
Forum section: electronics / beginners

author: lokajaudio
author_rank: Newbie
timestamp: June 12, 2021, 12:42:15 pm
content: Hello all, i am currently simulating this circuit is LTspicehere is link:https://www.rfwireless-world.com/Terminology/All-Pass-Filter-basics-and-types.htmlhere is simulation, can someone guess or explain, why there is such a big peak at resonant frequency (all pass filter has flat gain response)? is it because of quality factor of filter (Q) ?Thanks!

author: Benta
author_rank: Super Contributor
timestamp: June 12, 2021, 05:33:44 pm
content: Because of R3 and R4. What on earth are they doing in your filter?

author: lokajaudio
author_rank: Newbie
timestamp: June 12, 2021, 07:17:49 pm
content: So + of the amp should be grounded right?..

author: Benta
author_rank: Super Contributor
timestamp: June 12, 2021, 07:33:25 pm
content: Yup. Just remove R3. You can choose R4=R2 to balance DC bias/offset for the amp.
ALL PCB design softwares. - Page 1
Forum section: electronics / beginners

author: Munyua44
author_rank: Contributor
timestamp: January 17, 2022, 05:05:41 am
content: am interested in having a collection of all the PCB design software. Please! I need your input to make this successful.Thanks!

author: tautech
author_rank: Super Contributor
timestamp: January 17, 2022, 08:16:59 am
content: We have a special board for this stuff, you should go looking there:https://www.eevblog.com/forum/eda/

author: magic
author_rank: Super Contributor
timestamp: January 17, 2022, 09:52:03 am
content: Take a look at this threadhttps://www.eevblog.com/forum/eda/pcbeda-software-list/msg3936949/#msg3936949

author: rpiloverbd
author_rank: Regular Contributor
timestamp: January 18, 2022, 01:12:32 pm
content: Here is a list of 10 best PCB designing tools:https://www.theengineeringprojects.com/2021/02/10-must-have-tools-for-pcb-designing.html

author: cgroen
author_rank: Unknown
timestamp: January 18, 2022, 01:47:47 pm
content: Quote from: magic on January 17, 2022, 09:52:03 am
all vacuum tube phaser/phase shift circuit. - Page 1
Forum section: electronics / beginners

author: Deactivated-1
author_rank: Frequent Contributor
timestamp: June 06, 2020, 01:52:14 am
content: so I want to make a tube phaser that works more like a wah pedal. it doesn't oscillate is just stays on 'one setting'here's a circuit from a musicman rg150 I believe, I really like the phaser circuit in the setting that bypasses the oscillator.[ Attachment Invalid Or Does Not Exist ]I understand about 0 about solid state electronics, that's half the reason why I want to convert it to a tube circuit, or to be specific design a tube circuit that 'sounds' similar.maybe using like a tube vibrato circuit and mix it in with the raw circuit would lead to similar results?afaik when the phaser oscillator is bypassed, the opto's are just getting a constant voltage, and by changing the 'depth' control it changes the tone basically.

author: Benta
author_rank: Super Contributor
timestamp: June 06, 2020, 04:47:21 pm
content: Do you mean tremolo? Vibrato is changing the pitch rythmically (only possible if your finger is doing it directly on the string), tremolo is changing the volume/frequency response.

author: Benta
author_rank: Super Contributor
timestamp: June 06, 2020, 05:23:39 pm
content: Interesting.When I was younger and a rock guitarist, I used Marshall, Ampeg, Acoustic, HH amps and none of them had that function. They did have tremolo, though (and some even Reverb with an ingenious spring module).But I'll not rule out that vibrato pedals exist, just never used them myself (not necessary on the guitar).

author: Benta
author_rank: Super Contributor
timestamp: June 06, 2020, 05:44:03 pm
content: Quote from: ELS122 on June 06, 2020, 05:26:38 pmCan you link to one of those magnavox videos? I'm interested in listening to the effect.

author: Benta
author_rank: Super Contributor
timestamp: June 06, 2020, 06:53:28 pm
content: Thanks for the videos. It makes more sense now.Yes, it's a vibrato function, albeit an extremely shallow one. It's a phase-shift modulation of appr. +/- 60 degrees, which the ear perceives as a very small rythmic pitch shift.It only works with low-frequency modulation, a permanent pitch shift (as the guy in your last video postulates) is not possible.As I said, a very shallow pitch vibrato, working directly on the guitar string is much more effective.Completely oversold IMO, but if you like that kind of thing, go ahead.
ALLelectroNIX - Page 1
Forum section: electronics / beginners

author: ALLelectroNIX
author_rank: Newbie
timestamp: April 09, 2020, 11:18:55 pm
content: Hello y'all!!My name is Steffen, beter known as ALLelectroNIXI'm 24 years old, live in Belgium with my parents & I graduated last year in energytechnology in Odisee, Gent (highschool)2 weeks ago I started my own YouTube channel where I try to spread my knowledge of electricity and electronics into the worldFirst I tried it in Dutch but I quickly realised my public will be very small if I keep speaking Dutch in my video's so I tried to speak English in my last video (I'm not an expert in English)So if anyone of you checkedout my Dutch videos & they want them translated in English for better understanding, please let me know!Newest YouTube video:https://youtu.be/Bu4HtfuvupwBecause I'm new to this, it's very hard to get some people that actually watch my stuff.So i asked Dave from the EEVblog to help me, he said that I could try that here, on his forum, so here I am!Feel free to subscribe to my channel, give me advice, feedback,compliments,...Next to my YouTube channel, I also have have a facebook and instagram account.If you are intrested, you can also follow me on those platformsYouTube channel:https://www.youtube.com/channel/UCHvwcCHvQsAX3pnIVm1hergFacebook page:https://www.facebook.com/Allelectronix-100151294988683Instagram page: instagram.com/allelectronix_/
Alligator clips for Sanwa PM300? - Page 1
Forum section: electronics / beginners

author: doftipping
author_rank: Newbie
timestamp: December 14, 2021, 07:44:24 am
content: Hi everyone,does anyone know if I can get alligator clips that connect to the original test leads? I usually just cut them off and solder alligator clips on my el cheapo meters but this is is soooo nice i'd rather not do that. I've searched the forums and general internet with no luck! This is probably an ultimate newbie question......If anyone could point me in the right direction it would be much appreciated.Thanks,Dave

author: Kean
author_rank: Unknown
timestamp: December 14, 2021, 08:18:35 am
content: If I recall correctly, the probe tips are 2mm diameter - so you can likely use some 2mm banana to croc clips.You can get cheap & cheerful ones likehttps://www.ebay.com/itm/224084882492Or more expensive & safer ones like Cal Test CT4439, or Pomona 6264B

author: Kean
author_rank: Unknown
timestamp: December 14, 2021, 08:25:58 am
content: Forgot to say, those cheap & cheerful ones are a copy of the Hirschmann MA1 series croc clips (MA1RT/MA1SW).I've used the Hirschmann ones that came part of a set, but not tried the cheap ones.And apparently Pomona 5788 are similar ones for low voltagehttps://www.pomonaelectronics.com/products/hardware/alligator-clip-2mm-banana-jack

author: MarkF
author_rank: Super Contributor
timestamp: December 14, 2021, 09:51:25 am
content: My Fluke meters all accept the standard banana plug.I just swap out the whole test lead. And use the same leads with my power supplies.I bought several different sets (for example):Elenco TL-5, Banana to Small Alligator Lead SetElenco TL-16, Banana to Large Alligator Test Lead SetElenco TL-12, Banana to Mingrabber Lead SetElenco TL-18, Banana to Banana Test Lead Set

author: Kean
author_rank: Unknown
timestamp: December 14, 2021, 10:53:39 am
content: Quote from: MarkF on December 14, 2021, 09:51:25 amThe Sanwa PM300 is a pocker multimeter with hard-wired leads, so that isn't possible.

author: electr_peter
author_rank: Unknown
timestamp: December 14, 2021, 11:22:14 am
content: There are adapters from regular multimeter leads tips to banana/alligator clips/grabbers. On the end it has a socket with springs (reverse banana) of 2mm or less - just plug meter leads in. Franky used to sell these sockets/adapters.

author: jmelson
author_rank: Super Contributor
timestamp: December 14, 2021, 11:43:18 pm
content: Quote from: Kean on December 14, 2021, 08:18:35 am2mm is essentially .080" which was a standard probe tip size in the US.Jon
Alligator clips? - Page 1
Forum section: electronics / beginners

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 12, 2024, 01:31:38 pm
content: Hi,does anybody know where to order small but good quality gator clips? In the size of the cheap-cheap clips you get 10 for 1€ from China, but in the quality e.g. of the Tektronix or even Rigol ground clips from scopes? I think I don't need to upload a picture, these scope probe clips usually have a black and slightly angular shaped flexible housing instead of the shapeless shrinking tube and grip much more reliably on thin wires.Does anybody possibly know a mouser, reichelt or digikey order code?

author: jpanhalt
author_rank: Super Contributor
timestamp: July 12, 2024, 01:55:26 pm
content: I like Mueller clips. They carry a miniature size. Digikey, Mouser, and probably most distributors carry them. You can't get 10 for $1.10, though.https://www.muellerelectric.com/products/category/clips

author: BeBuLamar
author_rank: Super Contributor
timestamp: July 12, 2024, 02:44:54 pm
content: Quote from: Phil1977 on July 12, 2024, 01:31:38 pmWhy you add the phrase "from China"? Is the Tektronix not from China? I don't know. I am pretty sure the Rigol's are from China.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 12, 2024, 03:11:55 pm
content: Quote from: BeBuLamar on July 12, 2024, 02:44:54 pmI wanted to say "delivered incl. shipping for 1€ from China" because it´s an incredible economical madness that you can get so many things so cheap today. I don't say "from China" with any meaning of bad quality.

author: TimFox
author_rank: Super Contributor
timestamp: July 12, 2024, 03:26:29 pm
content: Quote from: jpanhalt on July 12, 2024, 01:55:26 pmI second the recommendation of Mueller, who I believe invented the modern alligator clip, along with the crocodile clip (which is different, seehttps://www.muellerelectric.com/products/bu-85c ).Their miniature alligator clipshttps://www.muellerelectric.com/product_files/205/DS-BU-30.pdfare my favorite.Mouser and DigiKey have them for about $0.50 USD at quantity 100.
Allround arbitrary wavegenerator ?  - Page 1
Forum section: electronics / beginners

author: othello
author_rank: Contributor
timestamp: August 27, 2013, 04:47:01 am
content: Hi All,Can some one recommend a few options when it comes to arbitrary wavegenerators for allround use ? I know there isa huge amount available but i'm hoping for something good in terms of quality below 500 USD.Thank you !UPDATE: went with a rigol, closing this topic hereby.
Alps potentiometer chassis mount - Page 1
Forum section: electronics / beginners

author: Hextejas
author_rank: Frequent Contributor
timestamp: November 18, 2018, 11:29:40 pm
content: do I need to drill a small hole to accommodate the small stud sticking out of the pot ?thanks

author: The Soulman
author_rank: Super Contributor
timestamp: November 18, 2018, 11:42:12 pm
content: Yes, it will prevent rotation of the housing.You could try to use a stack of anti turn washers but that is a bit of a hack. (not in a positive way)
Alright to use Relay? - Page 1
Forum section: electronics / beginners

author: AlexTheGreatish
author_rank: Newbie
timestamp: August 10, 2018, 04:55:07 am
content: So I've made a circuit where I want to use generated power to turn on a lightbulb or whatever. I want to have the output turn off immediately when the input stops, but I need a battery in between the input and output to help run the controller and act as a capacitor, but it's causing the light to stay on long after the input has been turned off.I am thinking of using a relay (probably an automotive one) so that if the input switches on the output (the funky colours in the diagram), but I'm not 100% sure how relays work so I'm afraid most of the current will go into the relay if I just hook it up to the input voltage and blow it up, or lead to large losses. Any examples I've seen for relays have been a small amount of voltage (from an Arduino or something) that switches on a higher voltage so I'm not totally sure about using one in this application. If there are some more electronically inclined people here could you let me know if this is a terrible idea?

author: james_s
author_rank: Super Contributor
timestamp: August 10, 2018, 05:00:29 am
content: As far as I can tell from your drawing it will work. Relays are very simple, you power an electromagnet inside the relay and it closes (or opens) one or more sets of switch contacts. Larger relays can draw a significant amount of power to run the coil but it is normally still far less than the draw of the load. Look at the datasheet for the relay you are considering to get the coil current.

author: Brumby
author_rank: Unknown
timestamp: August 10, 2018, 05:31:04 am
content: I take it the input voltage is DC ofaround24V.In this case, just find yourself a relay with a coil specified for 24V operation that has contacts rated for the voltage and current your inverter will be delivering.The basic concept of a relay is the same for all electro-mechanical types - but the range of applications is extremely wide - and there are literally hundreds of designs that range in size from smaller than a sugar cube to ones you will have trouble picking up. An automotive one may not be appropriate to use on 120VAC. Always check the specifications and make sure all of them are appropriate for the job.This is a pretty simple setup and, from what you have described, a suitable relay will be a very simple and effective solution.
Altec lansing VS4121 modification - Page 1
Forum section: electronics / beginners

author: Jeffrey Eagan
author_rank: Contributor
timestamp: February 10, 2013, 06:41:05 am
content: Hi all. I have the aforementioned computer speakers and I want to control it without its control board, but I follow the traces back and they don't help what-so-ever. Please help as this is my first project ever.

author: FenderBender
author_rank: Super Contributor
timestamp: February 11, 2013, 12:07:45 am
content: Pictures? Schematics?You don't give us very much information so it's hard to say anything!

author: Jeffrey Eagan
author_rank: Contributor
timestamp: February 12, 2013, 03:36:57 am
content: Agh! sorry xD I'm not used to write on forums that often!Okay, lemme make this a lot simpler. The main board has a TI1036N volume/treble/bass controller. and a TDA7377 amp. I just want to make those two work without all the other bull keeping the system from even powering up. So yeah. I hope that helps!

author: FenderBender
author_rank: Super Contributor
timestamp: February 12, 2013, 04:10:01 am
content: I'm still not sure exactly what you want to do away with. What's the problem with the current configuration?

author: Jeffrey Eagan
author_rank: Contributor
timestamp: February 12, 2013, 04:39:41 am
content: The speakers require some weird pin/voltage/current combination to turn it on. The on/off switch broke and I wanna just remove the amp and volume control pic's and just make those work together.

author: Jonny
author_rank: Regular Contributor
timestamp: February 14, 2013, 07:53:35 am
content: Would it not be easier to just solder wires across the power switch connections to make it always on, or mount another switch into the case and wire it in accordingly?Cracking open the switch may be required to study it's operation and work out which connections are shorted for 'on'
alternate datsheets or better examples for 4000 series ICs like the 405x mux? - Page 1
Forum section: electronics / beginners

author: dentaku
author_rank: Frequent Contributor
timestamp: February 28, 2014, 02:08:31 am
content: Old ICs have old datasheets which means that sometimes they're ugly, hard to read and difficult to decipher for beginners.I've found the datasheet for various versions of the 4051 8-channel mux and they all differ in how useful they are. I just found the modern NXP datasheet for the NEF4051 which explains it better so I think I understand how it works now (I completely misunderstood how it worked before finding the NXP datasheet), but since I have some quite old TC4051BP and SIL4051BE ICs I'd like to use, I can't assume that all the current and voltage figures of another version applies to something manufactured in 1975.Is there somewhere with lots of info on old 4xxx series chips, kind of like the "unofficial datasheets" with better examples of how they can be used?All the examples I'm finding are about using Arduinos with the 4051 but that doesn't help me much.Mostly, I want to know what NOT to do with it so I don't blow it up by looking at examples of it's basic functions.I simply want to switch the 4051 outputs on and off in sequence using a 4029 up/down counterwhich I already have set up and working.Can I light a row of 8 LEDs with this in sequence or do I have to use transistors to switch the LEDs?This horrible FRITZed thing seems to show LEDs being lit directly connected to the 4051 but the modern NXP datasheet looks like it tells me that there shouldn't be more than 10mA going through the switches.Page 6 - section 8 - Limiting Valueshttp://www.nxp.com/documents/data_sheet/HEF4051B.pdf

author: BravoV
author_rank: Super Contributor
timestamp: February 28, 2014, 02:18:51 am
content: Quote from: dentaku on February 28, 2014, 02:08:31 amAlthough not all digital circuits, the Elektor 3xx Circuits books series do have tons of examples using logic chip series.

author: dentaku
author_rank: Frequent Contributor
timestamp: February 28, 2014, 04:13:15 am
content: This seems to explain the creation of datasheets quite well.http://www.analog.com/en/analog-to-digital-converters/products/raq_jbryant_caveat_emptor_issue4/resources/faq.html?display=popupI found the link in this e-book.http://www.e-bookspdf.org/view/aHR0cDovL3d3dy5hbmFsb2cuY29tL3N0YXRpYy9pbXBvcnRlZC1maWxlcy9yYXJlbHlfYXNrZWRfcXVlc3Rpb25zLzQwMDBfU2VyaWVzX0FydGljbGUucGRm/NDAwMCBTZXJpZXMgTG9naWMgQW5kIEFuYWxvZyBDaXJjdWl0cnk=
alternative for hirose HR25-7TP-8S - Page 1
Forum section: electronics / beginners

author: smile
author_rank: Regular Contributor
timestamp: April 21, 2019, 07:13:53 pm
content: Hello, this connector (male) is used on a camera, is there cheap alternative for female part on cable?https://www.tme.eu/lt/details/hr25-7tp-8s-72/kitos-pramonines-jungtys/hirose/hr25-7tp-8s-72/
alternative for NUR460 - Page 1
Forum section: electronics / beginners

author: manubali
author_rank: Contributor
timestamp: May 16, 2018, 12:43:23 am
content: Hi, i am trying to repair power supply of smart tv and i have found that diode NUR460 is shorted,but this diode has been discontinued and i have found an alternative to it which is MUR460. its characteristics looks similar to NUR460 but i want to confirm if it will work without any problem as i am fairly new with repairing power supplies.datasheets:MUR460http://www.farnell.com/datasheets/2047391.pdfNUR460http://ween-semi.com/documents/NUR460.pdf

author: Phoenix
author_rank: Frequent Contributor
timestamp: May 16, 2018, 01:44:52 am
content: The diodes look pretty similar to me - current, voltage, forward drop, reverse recovery.If this is part of an SMPS circuit there is likely plenty of other component damage than just the diode. You'll need to thoroughly check all components.

author: manubali
author_rank: Contributor
timestamp: May 16, 2018, 02:36:10 am
content: Quote from: Phoenix on May 16, 2018, 01:44:52 amyeah one of the MOSFET and fuse is also blown.i made a mistake while ordering this diode,the old one had forward voltage of 1.28 volts but the one i ordered have forward voltage of 1.05 volts.do you think that would work? shipping charges are way higher than actual components on digikey and element14

author: Phoenix
author_rank: Frequent Contributor
timestamp: May 16, 2018, 04:13:24 am
content: Quote from: manubali on May 16, 2018, 02:36:10 amYou need to read the datasheets more carefully - they are the same! But you should also go look at their curves.NUR460 4A 25degC => 1.28VMUR460 4A 25degC => 1.28VMUR460 3A 150degC => 1.05VMUR460 3A 25degC => 1.25VIn any case a minor difference should not be a problem in an SMPS. The reverse recovery is more critical and this is comparable between diodes too.
Alternative freelancing websites - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: August 27, 2020, 03:46:45 pm
content: I found upwork good website and recently got one work there also.I was wondering if there are equivalent websites also for freelancers, which are genuine also.Was reading this:https://www.websitehostingrating.com/best-upwork-alternatives/#1-toptalAnyone has personal experience for other genuine sites also?
Alternative IC - Page 1
Forum section: electronics / beginners

author: foxwizzy
author_rank: Newbie
timestamp: March 13, 2021, 05:07:02 pm
content: Hello, i am new to the forum and relatively new to electronicsI bought a cheap hot air soldering station a JCD 8898, it worked great for a month, then something short-circuited and it was deadOpened it up and found an IC exploded, managed to read the code on the IC but only place i found to order it is CN and the minimum order is about 100pzMy question is : Is there an alternative forDK125?Thank you

author: wraper
author_rank: Unknown
timestamp: March 13, 2021, 05:32:20 pm
content: Where were you looking for them? Aliexpress is full of low qty listings.https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20210313093144&SearchText=dk125

author: DrG
author_rank: Super Contributor
timestamp: March 13, 2021, 05:35:18 pm
content: Quote from: foxwizzy on March 13, 2021, 05:07:02 pmI can see from simple searches that the DK125 is widely available and for an exact replacement you may need to go through vendors from China, but you should be able to get one - no?To answer your question directly, I do not know of a replacement. After a brief search, I could only locate a datasheet with lots of Chinese and have to "guess" at too much.https://datasheetspdf.com/pdf-file/1272595/DongKeSemicondutor/DK125/1There are others here that, likely, know more.A bigger problem is figuring out what went wrong.I think that you really need to evaluate that situation before just replacing that chip. Can you post a picture of the board? Do you have a schematic by any chance?

author: foxwizzy
author_rank: Newbie
timestamp: March 13, 2021, 05:40:15 pm
content: the thing is, 0.70$ price,1.40$shipment 30-50 days delivery or4.20$for next month deliveryif i cant find an alternative il go with that....

author: foxwizzy
author_rank: Newbie
timestamp: March 13, 2021, 05:42:40 pm
content: Quote from: DrG on March 13, 2021, 05:35:18 pmi attached a Google translated version of that file,

author: wraper
author_rank: Unknown
timestamp: March 13, 2021, 05:43:06 pm
content: Quote from: foxwizzy on March 13, 2021, 05:40:15 pm$0.14 with $0.68 shipping.

author: foxwizzy
author_rank: Newbie
timestamp: March 13, 2021, 05:50:29 pm
content: Quote from: wraper on March 13, 2021, 05:43:06 pmok, lest say the price is not the problem, am willing to pay, but the wait time is killing me 30-50, and then i think to my self what if it comes defective or gets damaged in transit wait another 30-50, that's why i am trying to find an alternative....something more european

author: wraper
author_rank: Unknown
timestamp: March 13, 2021, 06:04:08 pm
content: It has the same pinout and switching frequency as VIPER12A. However viper requires auxiliary winding for powering IC after it starts but DK125 can work without it.So if if transformer has auxiliary winding, you can use it as replacement. If it has only one winding on primary side, then such substitute will not work.EDIT: It will not work as substitute since it has much higher VDD.
Alternative parts for Dave's PSU  - Page 1
Forum section: electronics / beginners

author: amateur_25
author_rank: Regular Contributor
timestamp: January 16, 2012, 09:02:17 pm
content: HiI can't seem to get hold of the following parts in the uk. I can only order from us distributors which incur pricey delivery costs.Prefably dip alternatives as well so I don't need a breakout.NJM14558DMAX4238ASA+Does anyone have any alternative part numbers I can try?

author: EEVblog
author_rank: Unknown
timestamp: January 16, 2012, 09:13:52 pm
content: The NMJ14558 won't work anyway, it's not a ground sensing op-amp.I should check this stuff instead of relying on memory.An LM358 will work, but with a small offset.For the MAX4258A, the 4239 or any other very low offset chopper amp.Dave.

author: amateur_25
author_rank: Regular Contributor
timestamp: January 16, 2012, 09:32:37 pm
content: MC4558 and NJM14558D.they both have 4558 in them so I can assume they're similar right? Is this a standard or can it be that they're totally different?Am asking so if I ever come accross unavilible parts instead of asking for alternative like a newbie I can help myself

author: EEVblog
author_rank: Unknown
timestamp: January 16, 2012, 09:34:35 pm
content: Quote from: amateur_25 on January 16, 2012, 09:32:37 pmThey are similar, but not identical. Always check the datasheet for the specs you are interested in.Dave.

author: amateur_25
author_rank: Regular Contributor
timestamp: January 26, 2012, 09:17:55 am
content: HiSorry for reviving an old thread. I thought I'd ordered the LM354 but it's not on the receipt. I did a quick look at similar op amps, would the TLC272IP be appropriate? According to the info rs has listed it's the same as the tlc272bcp except it has a 7mv max offset instead of 2mv.

author: EEVblog
author_rank: Unknown
timestamp: January 26, 2012, 09:23:55 am
content: Quote from: amateur_25 on January 26, 2012, 09:17:55 amYou haven't seen my latest video? I now use a TLC272.Dave.
Alternative power source - Page 1
Forum section: electronics / beginners

author: IRFP
author_rank: Contributor
timestamp: March 02, 2019, 01:42:54 pm
content: Hello everyone,I need to realize a variable voltage and frequency alternative power source.> U 230 V for a power of 200 VA max.The idea is to use a class D audio amplifier with an output transformer output.At the input of this amp, a GBF to generate the sine wave at variable frequency.Which of you have already developed a similar device?Who in diagrams with the characteristics of the transformer?Thank you for your feedback.
Alternative to FFC board to board interconnect. - Page 1
Forum section: electronics / beginners

author: Jackster
author_rank: Frequent Contributor
timestamp: June 12, 2017, 10:21:38 am
content: Hi all.So currently I am using FFC cables to connect 3 boards together. The main problem is is that these are really hard to mount onto the board as I am soldering these all myself.The room is so small on my boards that I am having to use 1mm cable which results in 0.5mm pin pitch on my circuit boards.I am getting some boards made but yields are low.What are my other options for board to board interconnect when you have very little room, not able to use hard connectors like pin headers etc?ThanksJack,

author: ManCave
author_rank: Regular Contributor
timestamp: June 12, 2017, 10:38:57 am
content: you could design the three boards with built-in interconnection to each other on a rigid-flex PCB like this:

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 12, 2017, 11:08:15 am
content: Quote from: Jackster on June 12, 2017, 10:21:38 amAre you soldering the cables or the connectors?If the former then you are doing it wrong.And how do 1mm cables result in 0.5mm pitch?

author: Jackster
author_rank: Frequent Contributor
timestamp: June 14, 2017, 07:22:16 am
content: Quote from: ManCave on June 12, 2017, 10:38:57 amWayyy above my skill level with PCB design.Looks awesome though!Quote from: mikeselectricstuff on June 12, 2017, 11:08:15 amConector. Sorry the pitch is 1mm but the pins are 0.5 from the looks of it?
Alternative to LTC4020 - Page 1
Forum section: electronics / beginners

author: jram
author_rank: Contributor
timestamp: May 21, 2018, 08:45:52 am
content: I like the feature set of this chip a lot. I'd like to implement it as a LiFePO4 battery charger for a design load of 40A, 14V. However, its expensive and in a 38 pin package for which there don't seem to be much in the way of adaptors.I've also read the odd negative comment about avoiding getting sucked down the 'Linear' path for reasons of cost. So I'm wondering about viable alternatives that members have experience of?ThanksJohn
Alternative to the Diode Transil - Page 1
Forum section: electronics / beginners

author: maher471
author_rank: Contributor
timestamp: November 08, 2022, 02:42:22 pm
content: hi,for this 220V to 110V converter, can i omit this transil diode (1.5KE68A1) or is it essential, (i do not have such this component ) , otherwise if there is an alternative (put a varistor or EPCOS Switching Spark Gap !!!)link :https://www.tehnomagazin.com/Power-supply/220V-to-110V-step-down-circuit.htmthanks in advance

author: jonpaul
author_rank: Super Contributor
timestamp: November 08, 2022, 03:51:29 pm
content: No, the transi is essential.Can use similair HV ZenerEntire circuit is shaky and dangerous.Especially if the mains power supply is poor quality ( regulation, transients)suggest a simple and reliable 240v to 120v step down transformers of VA rating for the loadJon
Alternative to this SMT connector - Page 1
Forum section: electronics / beginners

author: VEGETA
author_rank: Super Contributor
timestamp: June 25, 2024, 12:37:11 am
content: Hello,I have a project which needs an SMT bottom entry receptacle, and the only one found is this one:BH015-05-C-EI have other similar 5 pin bottom entry receptacles but they are through hole, they work fine for other connectors but this particular one needs to be SMT since the bottom side of the board will touch a ground tab (part of device rf shield).since the board bottom side touches that grounded tab, it will short if the connector is through hole.I found this one linked above to be the only one which works for the purpose but it is expensive and no alternative exists... thus I need to find an alternative if possible. It has to be board to board plug in connector.thanks

author: VEGETA
author_rank: Super Contributor
timestamp: June 25, 2024, 08:20:06 am
content: I ended up contacting manufacturers in Alibaba and they can make it. I will be waiting for pricing to see if there is a merit of going Alibaba route vs getting the digikey one.

author: mariush
author_rank: Super Contributor
timestamp: June 25, 2024, 08:36:51 am
content: I don't know how you only found one surface mount bottom entry header... there's thousands of them ... seehttps://www.digikey.com/short/708d4jf1instead of inline 5 also consider 2x3 or 2x4 arrangements as they'll also be more reliable, better for surface mount contacts , less chance of bending the header and lifting pads (due to mechanical shocks or other reasons)

author: VEGETA
author_rank: Super Contributor
timestamp: June 25, 2024, 12:37:26 pm
content: Quote from: mariush on June 25, 2024, 08:36:51 amyes there are a ton of them but i need 3.96mm pitch which is rare for some reason.if you filter for 3.96mm and surface mount you find only 3 parts all of which are the same company, one of them is the part i listed.alibaba supplier was good in contact and agreed to send the samples. the unit price for my quantity is just 0.185$ which cannot be beaten. this thing is a PSU which will connect to a board, 2 amps max so there should be no wear and tear or danger of any kind.i actually once got a similar connector from another similar chinese company (CJT) for the same purpose but that one was through hole for my product (thunderpsu for dreamcst) and it was good and reliable.i also looked into lcsc as usual but found nothing. all parts are "pre-order" with prices even higher than digikey.the currently sampled part from china is exact same as the one from digikey so i will set the digikey one as alternative.
Alternative way to turn on/off video of HDMI and DP cables - Page 1
Forum section: electronics / beginners

author: Paldin
author_rank: Newbie
timestamp: December 15, 2024, 07:53:08 pm
content: I want to be able to turn on and off the video (i don't mind if other stuff like audio also turns off) of HDMI and DP cables (male to female) coming out of my PC/GPU with esp32 powered by my PC USB.For HDMI I used pin 19 and I control it with relay that controlled by ESP32. For DisplayPort I used pin 18 that is controlled by another relay.I wonder if it is safe to do and if there is alternative to two relays. My question is more about the cables side and how to control them safely and efficiently.

author: u666sa
author_rank: Frequent Contributor
timestamp: December 16, 2024, 08:05:54 pm
content: Video to monitor?Probably off top here your thread, but this is idea and solution. Let's say you got DP going to monitor and you want to turn it off. You reach behind monitor and rotate joystick to switch to some other input, like HDMI. Monitor turns off.

author: Paldin
author_rank: Newbie
timestamp: December 16, 2024, 10:43:20 pm
content: @u666sa I could also simply turn off the monitor, but it doesn't serve the purpose of my project. The HDMI and DisplayPort will be synced, so both off or both on.
Alternatives to mains 'block connector' inside equipment? - Page 1
Forum section: electronics / beginners

author: icon
author_rank: Regular Contributor
timestamp: March 18, 2015, 10:52:47 pm
content: HiI need to joint some 240V cables inside an enclosure - it's between the power switch and a transformer. For ease of assembly (and possibly disassembly!) I don't want to solder the transformer's cables directly to the switch.I'm using this type of plastic covered 'block connector' screw terminal:having cut off and screwed down a couple of 'units'.It feels a bit 'bush league', but I can't off-hand think of a better way of doing it. What is there?ThanksJohn

author: ABroodryk
author_rank: Newbie
timestamp: March 18, 2015, 11:10:06 pm
content: Have you thought of Spade connectors?

author: electr_peter
author_rank: Unknown
timestamp: March 18, 2015, 11:27:23 pm
content: Check out these Wago connectors. Cheap, reusable, easy and much better than nasty type of screw terminals in the first picture.http://global.wago.com/en/products/product-catalog/terminal-blocks-connectors/installation-connectors/compact-splicing-connectors-all-conductor-types-222-series/index.jspThere are matching boxes to contain these Wago connectors for weather proofing and connection strength.

author: amyk
author_rank: Super Contributor
timestamp: March 19, 2015, 12:04:54 am
content: Those terminals are quite standard, you'll find them used inside various appliances for mains wiring.

author: icon
author_rank: Regular Contributor
timestamp: March 19, 2015, 12:11:21 am
content: HiThanks for the replies; in the first case, I had toyed with an 'in-line' spade connector, but I didn't really like the idea of the joint flapping around inside the enclosure unsecured.Now those Wago connectors are cute. Without any scale, I assumed from the picture that they were large, but they're actually pretty small. Shame they don't have a provision to screw them down, like my 'nasty' connectors! Otherwise, they're rattling around inside the enclosure, looking for trouble.John

author: cs.dk
author_rank: Unknown
timestamp: March 19, 2015, 05:30:02 am
content: What about a DIN Rail terminalblock?http://www.newark.com/weidmuller/1020000000/terminal-block-din-rail-2-position/dp/32M7199?MER=PPSO_N_P_EverywhereElse_None

author: Monkeh
author_rank: Super Contributor
timestamp: March 19, 2015, 05:37:20 am
content: Wago 862 series:

author: Mr.B
author_rank: Unknown
timestamp: March 19, 2015, 07:08:08 am
content: IMHO your original cheap screw terminal connector is fine.I use this method, but use "bootlace ferrules" on the cables so that the stranded copper doesn't get mashed...
Alternatives to rechargeable LED "Moon Lamp" for my US friend's grandson? - Page 1
Forum section: electronics / beginners

author: nzo
author_rank: Regular Contributor
timestamp: December 07, 2017, 03:08:13 am
content: As a 3D printing project I've wanted to build a small bedside "Moon Lamp" for my US friend's 1½ yo grandson. He loves moons.Sadly the Malaysian manufacturers of the rechargeable LED light that sits inside the moon no longer make them.I wondered if there might be a suitable alternative - a circuit I could assemble (I'm hopeless at electronics design)?I'd be glad of any suggestions. I've included a pic of the pre-made board.Thank you!
Alternatives to relays for 30-40A DC load switching/fake ebay ssr - Page 1
Forum section: electronics / beginners

author: badjob
author_rank: Contributor
timestamp: July 27, 2019, 11:00:01 am
content: I made a relay with a snub diode to turn on my inverter. Unfortunately the relay draws 100ma current. I've heard of using mosfet based SSRs but the real ones are $80+. Looked at ebay but I know they are fakes, people have had serious trouble with under rating on the DC->AC parts... to the point of starting fires. The reviews for those are all over. Unfortunately not too many have used the DC to DC type. The 40A rated ones I see were supposedly 15A, no info on the 60 or 100A which could in theory be 30-40A or the same with a different label.Are there any other alternatives to switching a large current with a small one in isolation? I'm more looking for a product and not cobbling discrete components together due to packaging (I know, booo! hisss!).
Although I've had fun in EE, I feel I've been disillusioned, and SW appears fun - Page 1
Forum section: electronics / beginners

author: renzoms
author_rank: Regular Contributor
timestamp: August 25, 2021, 12:04:10 am
content: tl;dr video. software > electrical?... Although I've had fun in EE, I feel I've been disillusioned, and Software appears more fun... Post herebtw heysometimes we interact! :wave: Thanks for everything.

author: Nusa
author_rank: Super Contributor
timestamp: August 25, 2021, 05:06:46 am
content: Hardware people need to understand how software is used in their designs and be able to write test code, even if someone else writes the production version.Software people need to understand the hardware they are writing code for, and know when to point out hardware issues that should be changed.There's a lot of overlap, and being able to do both is valuable.Of course, there are many software fields that don't involve much hardware....if that's what you really want, go for it. In most cases, ability is what counts, regardless of your prior education.

author: james_s
author_rank: Super Contributor
timestamp: August 25, 2021, 05:56:04 am
content: Frankly in the vast majority of cases you can make a lot more money in software. I did some hardware work for a while, always thought it was what I wanted to do but I found out pretty quickly from actually doing it that I enjoy it a lot more when it's a hobby. Software pays my bills.
Altium Desiger pcb milling via dxf - Page 1
Forum section: electronics / beginners

author: MarkoAnte
author_rank: Regular Contributor
timestamp: July 17, 2014, 08:25:56 pm
content: Hi,I got a STEPCRAFT cnc machine and would like to mill pcb on it. The cnc is usb controlled and the included software can read plt files and some dxf files.I normally use DIPTRACE but its export is horrible. I then tried using altium designer and made a quick test circuit and it did a better job.Picture of diptrace exporthttp://shrani.si/f/1v/sl/3CItEMmr/1121.jpgPicture of altium exporthttp://shrani.si/f/3D/SH/4oFfU8gS/pcb11.jpgThe cnc cuts where there are lines. So the diptrace export would cut where the traces would be off and the coper pure would be cut off too. I tried mirroring it but I didn't get better resultants. The altum export is better as it would make a coper pure and traces but where the traces connect to the pads they would still be milled out and the right trace is supposed to be inside the coper pore but is still visible.So my question is how can I export a dxf file that will work for milling pcb. Or am I doing around this thing the wrong way?
ALTIUM DESIGNER  - Page 1
Forum section: electronics / beginners

author: sebastian henao
author_rank: Newbie
timestamp: April 18, 2024, 03:49:15 am
content: Here in this link you can see what's the problem.https://drive.google.com/file/d/1e82knod6GN3R2SawlPxKnnixfhyZafib/view?usp=sharing
ALTIUM DESIGNER  - Page 1
Forum section: electronics / beginners

author: sebastian henao
author_rank: Newbie
timestamp: April 18, 2024, 03:54:24 am
content: In this video you can see what is happening.https://drive.google.com/file/d/1e82knod6GN3R2SawlPxKnnixfhyZafib/view?usp=sharing

author: tooki
author_rank: Super Contributor
timestamp: April 18, 2024, 06:59:41 am
content: Bruh… why is this a poll?Anyway, Altium hides text once it goes below a particular size. You can set that size in the preferences, if I’m not sorely mistaken.I highly, highly recommend running Altium on 4K (UHD) displays. Being able to see detail like net names and pin numbers when zoomed out is a huge advantage they enable.

author: Psi
author_rank: Super Contributor
timestamp: April 18, 2024, 07:33:01 am
content: Yeah, that's normal, if the text gets too small Altium stops showing it.I've not played with settings to see if you can change this point, but i've never had an issue with the default.