hybridfree/eevblog-posts huggingface dataset:
Reciprocity theorem, not working - Page 1
Forum section: electronics / beginners

author: nForce
author_rank: Frequent Contributor
timestamp: December 31, 2015, 11:06:09 pm
content: I have build this circuit in LT spice:I have measured the current Ia, it is 0.453 mA.Then I have change the voltage source and the branch where I had earlier measured the current. And it is 1 mA.How? It is a bilateral circuit. Thank you for your help.

author: IanB
author_rank: Super Contributor
timestamp: December 31, 2015, 11:16:36 pm
content: I am not understanding your question.In the circuit as shown you have total loop resistance of 11/3 kilohms. The inductor L1 is not relevant with DC and can be ignored.The supply voltage is 5 V DC. Therefore the total loop current is 3/11 x 5 = 1.364 mA.The current through R4 is 1/3 of the total, so 1/3 x 3/11 x 5 = 5/11 = 0.456 mA. This is what you have in the simulation.Now, what are you changing in the circuit for the next part? I am not clear on that.

author: nForce
author_rank: Frequent Contributor
timestamp: December 31, 2015, 11:23:18 pm
content: Yes what you said is correct.I have switched the R4 with V1 (voltage source).

author: IanB
author_rank: Super Contributor
timestamp: December 31, 2015, 11:57:57 pm
content: Quote from: nForce on December 31, 2015, 11:23:18 pmOK, if we do that then the total loop resistance is now 5 k in parallel with 1 k, which gives 5/6 k. That makes the total loop current 6 mA. This current will split so that 5/6 of it flows through R3, and 1/6 of it will flow through R1, R2 and R4. So the current through the R1 branch will be 1 mA.

author: nForce
author_rank: Frequent Contributor
timestamp: January 01, 2016, 12:03:00 am
content: Yes I know it's 1 mA. But why the theory isn't consistent with the practical circuit.https://electronicspani.com/reciprocity-theorem/

author: IanB
author_rank: Super Contributor
timestamp: January 01, 2016, 12:04:42 am
content: If you want the reciprocity theorem to work, you must just move the voltage source and the current measurement. You must not move the resistor R4 because that changes the topology of the circuit.

author: IanB
author_rank: Super Contributor
timestamp: January 01, 2016, 12:09:05 am
content: Suppose you put V1 where Ia was measured, then the old V1 becomes a short circuit.Now R1 and R2 are in parallel with R3 giving 3/4 kilohms, and this is in series with R4 giving a total loop resistance of 11/4 kilohms.The total loop current is therefore 5 x 4/11 = 20/11 mA.If we measure the current through R1 (where V1 used to be), then it will be split 1/4 through this branch and 3/4 through R3.Therefore the current through R1 is 1/4 x 20/11 = 5/11 mA, the same answer as previously.

author: nForce
author_rank: Frequent Contributor
timestamp: January 01, 2016, 03:05:16 pm
content: I get it now, thank you.
Recognise This Connector - Page 1
Forum section: electronics / beginners

author: veryevil
author_rank: Unknown
timestamp: May 03, 2014, 09:35:45 pm
content: Hey, I'm looking for the real name / a proper UK supplier for these connectors. Do you recognise them?http://www.connector-terminal.com/5102-5104-(2.5mm-pitch)-series-wire-to-wire-connectors-termainal-cable-connector-wire-crimp-terminals.html

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 03, 2014, 10:45:59 pm
content: http://www.jst.com/

author: veryevil
author_rank: Unknown
timestamp: May 03, 2014, 11:06:38 pm
content: Looking but not finding. any more specific?

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 03, 2014, 11:13:47 pm
content: There are many 2.5mm pitch connectors on that website. They want you to select an application (wire-to-board, card-edge, board-to-board, etc.) and then you can view all the 2.5mm pitch products. Invest a bit more time looking around. And there are other websites that help in connector identification. Particularly if you have the pin-pitch measured properly.

author: fluxcapacitor
author_rank: Frequent Contributor
timestamp: May 03, 2014, 11:27:51 pm
content: they are like pc fan connectors Have a look on ebay at 3 pin and 4 pin .http://www.ebay.co.uk/sch/i.html?_nkw=3+pin+fan+connector

author: JoeO
author_rank: Frequent Contributor
timestamp: May 04, 2014, 02:03:40 am
content: adafruit.com has then already made up into cables, 2,3,4,5 and 6 pins

author: electrolux
author_rank: Regular Contributor
timestamp: May 04, 2014, 03:13:26 pm
content: Chck this one outhttp://www.ttiinc.com/object/me-bishop-20101026.html
Recomandation for Philips PM9353 power supply - Page 1
Forum section: electronics / beginners

author: Ghitza
author_rank: Contributor
timestamp: April 17, 2020, 01:28:32 am
content: Hello guys,I've just bought a Philips PM9353 FET Probe.Some accessories are missing but that's OK I consider for 38,50€ that I've paid for the probe.The owner has sold it without power supply. By what I saw it is supplied with +24Vdc/ 32mA and -24Vdc/ 40mA.What recommandations you have in this case and some diagram schematics please.Is it better to use an linear power supply instead of a SMPS in this case?Most probably the voltage should be stabilised or not?Also I saw the small power supply cable from the probe is shielded.Do I need to do the same for the power supply's cable?I'm ultra beginer in this filed that's why I ask you this.And please accept my apologies for my bad english also.Thank you very much!

author: Vovk_Z
author_rank: Super Contributor
timestamp: April 18, 2020, 03:30:01 pm
content: Linear regulated power supply will be better of cause.
Recomendations for learning Verilog - Page 1
Forum section: electronics / beginners

author: pieroc91
author_rank: Contributor
timestamp: September 07, 2018, 04:16:56 pm
content: Hi everybody.I'm learning verilog by the hard way. i got an altera cyclone iv based board and trying to convert it in the missing storage and control unit of the very first digital reflex camera.right now i got to talk to the camera by sending commands and it responds well but at the moment of implementing it on a push button it made me realize that i need to learn more before i can start to code something serious.what you guys recommend me to start reading/testing to learn verilog?Thanks everybody!

author: Mattjd
author_rank: Regular Contributor
timestamp: September 07, 2018, 04:54:36 pm
content: Quote from: pieroc91 on September 07, 2018, 04:16:56 pmObviously, you need to first learn digital logic, but I am assuming you know this. After that I'd look at altera's recommended coding styles.https://people.ece.cornell.edu/land/courses/ece5760/DE1_SOC/HDL_style_qts_qii51007.pdfTeaches you how to describe basic elements that best work with their synthesizerAfter that,or I should say before that even, look at thishttps://www.fpga4fun.com/There's also an Altera pdf somewhere that tells you how to implement floating point operations, but I can't seem to find it today.

author: pieroc91
author_rank: Contributor
timestamp: September 07, 2018, 05:50:54 pm
content: Thanks for your answer Mattjd, i'll give them a read

author: pieroc91
author_rank: Contributor
timestamp: October 31, 2018, 02:03:17 pm
content: By the way, i found this PDF, really good for startershttp://d1.amobbs.com/bbs_upload782111/files_33/ourdev_585395BQ8J9A.pdf
recommend 74 logic family parts - Page 1
Forum section: electronics / beginners

author: nour
author_rank: Frequent Contributor
timestamp: February 28, 2016, 07:27:19 am
content: as every one knows, they are cheap and available everywhere, I have some gates and flip flopsIt would be nice if someone has long experience in digital electronics would recommend us list from the 74 family that he used over the years that he might think they are useful to have

author: jwm_
author_rank: Frequent Contributor
timestamp: February 28, 2016, 08:52:16 am
content: Don't forget to stock up on cd4000 logic as well, not many families can be run on anything from button cells to car batteries without regulation nowadays.

author: tggzzz
author_rank: Super Contributor
timestamp: February 28, 2016, 09:23:05 am
content: Quote from: nour on February 28, 2016, 07:27:19 amIn my experience that will not be helpful. Nowadays, in most parts of the world, you can order the components you need and have them delivered remarkably quickly and cheaply. =For many reasons, the best technique is to work out what you want do, work out how you want to do it, then simulate the circuit either by hand or by using a "proper" simulator. And then buyallthe components including PSU, decoupling components, and circuit board (preferably not a springleaf breadboard).

author: MrSlack
author_rank: Frequent Contributor
timestamp: February 28, 2016, 09:31:55 am
content: Quote from: jwm_ on February 28, 2016, 08:52:16 amThis. I don't really use 74-series anymore as 90% of what I do is sub-1MHz. Stock items for me are 4001, 4011, 4013, 4017, 4023, 4026, 4040, 4046, 4049, 4060, 40106, 4518 and some CMOS 555's. Oh and Don Lancaster's CMOS Cookbook. Amazing what you can do with that selection of ICs - it's an entire branch of electronics on it's own.
Recommend a book/pdf for circuit analysis - Page 1
Forum section: electronics / beginners

author: bladerunner
author_rank: Newbie
timestamp: June 17, 2022, 08:21:50 am
content: hello,Could anyone link me to a book or online pdf that teaches analog circuit analysis starting from the most basic resistor circuits and continuing to very complex circuits. Importantly, I would like a set of problems and labs to be included so that I can follow and implement each one. It would be a good way for me to practice my skills. Having the solutions included would also be nice.There are just soo many books that teach electronics, but I want a lab focused book with tons of projects. It's more fun for me to learn by doing than simply reading.Eager to hear your suggestions.thanks

author: bd139
author_rank: Super Contributor
timestamp: June 17, 2022, 01:56:51 pm
content: If it's theory and questions you want, it's Foundations of Analog and Digital Electronic Circuits by Anant, Agarwal ; Jeffrey, Lang. It's on library genesis if you are averse to paying for a copy.If you want to actuallydosomething, the following is appropriate:http://learningtheartofelectronics.comI would suggest mixing the two in equal parts.

author: rstofer
author_rank: Super Contributor
timestamp: June 18, 2022, 03:23:49 pm
content: Dave did a comparison of textbooks:

author: tepalia02
author_rank: Regular Contributor
timestamp: June 21, 2022, 08:21:45 am
content: Hi, for analog electronic circuits you can study Operational Amplifiers and Linear Integrated Circuits by Coughlin & Driscoll.

author: Terry Bites
author_rank: Super Contributor
timestamp: June 21, 2022, 01:04:38 pm
content: John Bird's book Electrical Circuit Theory and Technology is very popular. It covers just about everything. Here's a link to a free copyhttps://nvhrbiblio.nl/biblio/boek/Bird%20-%20Electrical%20circuit%20theory%20and%20technology,%205e.pdfOn line courses, eg.www.tutorialspoint.com/network_theory/index.htmpdf versionwww.tutorialspoint.com/network_theory/network_theory_tutorial.pdfSearch for "electrical network theory"
Recommend a DIY micro-computer kit? - Page 1
Forum section: electronics / beginners

author: rain1
author_rank: Newbie
timestamp: July 25, 2016, 10:48:55 pm
content: would anyone be able to recommend a kit I could get which has a PCB and components to solder in to build a computer? It could be based on ATmega or Z80 or 6502 or anything like that!Maybe something like that is too ambitious, I've soldered a few things before but nothing too complex.

author: Kappes Buur
author_rank: Regular Contributor
timestamp: July 25, 2016, 11:31:53 pm
content: Build a barebone arduino

author: Simon
author_rank: Unknown
timestamp: July 26, 2016, 05:54:35 am
content: Quote from: Kappes Buur on July 25, 2016, 11:31:53 pmdear god no!

author: newbrain
author_rank: Super Contributor
timestamp: July 26, 2016, 10:48:31 am
content: Quote from: Simon on July 26, 2016, 05:54:35 amI just skimmed the video with audio off.But I will not listen to anyone who writes MHz as MGHZ.

author: bitslice
author_rank: Frequent Contributor
timestamp: July 26, 2016, 11:28:41 am
content: Have a look at the N8VEM Homebrewing projecthttp://obsolescence.wix.com/obsolescence#!n8vem-overview/csbva range of boards to go from a simple SBC to a rack system.personally I find Z80 designs easier to understand.board listinghttps://www.retrobrewcomputers.org/doku.php?id=boardinventory

author: daybyter
author_rank: Frequent Contributor
timestamp: July 26, 2016, 11:37:16 pm
content: http://uzebox.org/forums/viewtopic.php?f=7&t=1156

author: rstofer
author_rank: Super Contributor
timestamp: July 27, 2016, 12:10:07 am
content: I bought a couple of the Nuts and Volts Magazine Amiga computers for my grandson to solder:http://store.nutsvolts.com/project-kits/sku17367They're kind of interesting being based on the Parallax Propeller chip. This chip has 8 'cores' running in parallel so it's possible to do some interesting things.FWIW, the soldering is not difficult.

author: Seekonk
author_rank: Super Contributor
timestamp: July 27, 2016, 01:56:26 am
content: Why do you want to build one, just to prove you can solder? You will have enough problems. Just buy something simple like a bare bones UNO for $5 and then buy some stuff to go with it. I would never suggest the kits that supply a bunch of stuff that will never be used. Micros are like children. Each of them are different, but they are all the same. You will never figure out what to use till you find out what you don't like.

author: rain1
author_rank: Newbie
timestamp: July 28, 2016, 12:33:47 pm
content: Thanks so much for all the interesting links and advice from everyone!Quote from: Kappes Buur on July 25, 2016, 11:31:53 pmthis seems like a really good easier thing to start off doing.. I'm going to do something a bit like that! video made me realize how good an idea it is to use sockets/headers so that I can replace the parts easily.

author: Galenbo
author_rank: Super Contributor
timestamp: July 29, 2016, 09:13:24 am
content: Quote from: rain1 on July 25, 2016, 10:48:55 pmThe cheapest option I see is to take a working obsolete Windows computer, burn/cook/melt the components off, and solder them again.
recommend a oscilloscope for a old begginer - Page 1
Forum section: electronics / beginners

author: amtpdb
author_rank: Regular Contributor
timestamp: August 25, 2012, 11:03:41 pm
content: Hi:I have always been interested in electronics but had very little formal training. I used a 20mhz scope years ago in a aviation class for a short time. I want to get more involved as I get ready to retire. I have looked at ebay for scopes for some time. I have been outbid always! Most of the scopes do not come with probes, why is this and where and which probes should I look to purchase? What mhz scopes should I be trying to purchase to work on aircraft radios, car computers, and or radio control equipment. Can anyone suggest scopes that they feel would be best for a beginner and would still be useful for some time as I learn? I need the cost to be not over 300.00. Also, as I don't know a great deal about them, are there any videos to show the different things that make a scope useful? I live in Southern California, USA.Thanks for any helpful suggestions and or comments.Don

author: poptones
author_rank: Frequent Contributor
timestamp: August 26, 2012, 02:06:27 am
content: If you're in socal, you should be able to find deals within 100 miles on craigslist.

author: robrenz
author_rank: Super Contributor
timestamp: August 26, 2012, 02:37:46 am
content: w2aew has very good videos on general scope useage and more.This thread are his videoshttps://www.eevblog.com/forum/beginners/oscilloscope-training-class-(long)/msg141020/#msg141020And here is his YT channelhttps://www.youtube.com/user/w2aew/videos

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: August 26, 2012, 02:56:17 am
content: Quote from: robrenz on August 26, 2012, 02:37:46 amThis is excellent advice. As far as an entry-level scope (I'm assuming you're looking for an analogue solution), the 465b was a workhorse/staple for a long, long time and can be had at a reasonable price (sub $300).

author: Psi
author_rank: Super Contributor
timestamp: August 26, 2012, 05:56:49 am
content: If you plan to work on the output stage of radio transmitters keep an eye out for a spectrum analyzer.If your working below 1000mhz then cheap ones are easier to find.
Recommend bench power supply 6V/10A for under $200? - Page 1
Forum section: electronics / beginners

author: sofakng
author_rank: Regular Contributor
timestamp: June 05, 2021, 02:12:03 am
content: Does anybody have any suggestions on a budget PSU that can handle 6V / 10A?There are lots of cheap PSUs on Amazon but they all seem very similar. I also can't quite afford a nice Agilent or similar.EDIT: What about something like the Riden 6018?

author: Jackster
author_rank: Frequent Contributor
timestamp: June 05, 2021, 03:43:23 am
content: Can't go wrong with the RIDEN stuff unless if you need a high-quality power supply that matches the performance of Agilent or similar.It is a little noisy but overall not half bad.

author: oPossum
author_rank: Super Contributor
timestamp: June 05, 2021, 03:49:04 am
content: HP 6282AYou can get them for about $100 on eBay.

author: Electro Fan
author_rank: Super Contributor
timestamp: June 06, 2021, 04:00:01 am
content: Slightly over the budget but might be worth a look:https://www.sra-solder.com/korad-ka3010d-precision-variable-adjustable-30v-10a-dc-linear-power-supply-digital-regulated-lab-grade

author: bdunham7
author_rank: Super Contributor
timestamp: June 06, 2021, 04:33:29 am
content: Power Designs 1210Shttps://www.ebay.com/itm/143656914687

author: ocset
author_rank: Super Contributor
timestamp: June 06, 2021, 11:26:14 am
content: i take it the input is mains?You could by a cheap 24Vout 100W power supply with mains input.Then shove a buck on its output with variable voltage output.To vary the output voltage of an smps, simply adjust the reference voltage into its error amplifier.Do you even need variable voltage output?Just buy any old mains to 6V power supply.........6v is an unusual voltage but many 5vout ones have a vary screw so you can adjust it to 6v.
Recommend: iron tip temp thermometer  - Page 1
Forum section: electronics / beginners

author: adiaz
author_rank: Newbie
timestamp: May 11, 2022, 01:11:47 pm
content: Hello! I have a “pre-digital” Hakko FX-888 that’s about 12+ yrs old. I’d like to get a tip temperature thermometer for it to check and calibrate the irons temps if needed but would rather not spend on something more expensive than buying a new iron.Any recommendations on trustworthy units would be greatly appreciated. Thanks in advance!

author: Doctorandus_P
author_rank: Super Contributor
timestamp: May 11, 2022, 02:24:30 pm
content: Calibrate your soldering iron by setting the knob to where your solder melts.Then you know the tip temperature from the alloy of your solder.

author: MikeK
author_rank: Super Contributor
timestamp: May 11, 2022, 02:48:38 pm
content: I have the non-D version, too. Is there a schematic available for the D? The 888 and 888D, I assume, are heating the tip the same way.

author: IanB
author_rank: Super Contributor
timestamp: May 11, 2022, 02:50:55 pm
content: Building on what was just said, the correct or best tip temperature for a soldering iron is a process question. It depends on the solder alloy, the type of flux, and the nature of the work. The temperature should be adjusted so that the soldering process proceeds as effectively as possible with the best quality results.So to calibrate an iron you should adjust the temperature to get the optimum results for a particular kind of soldering task you perform, and then remember that setting (write it down or mark it on the dial).As for measuring the actual temperature I think typical thermometers are just a thermocouple suspended on a wire bridge so you can press the iron against it. So a workable alternative is to use any regular thermocouple and simply hold it against the surface of the iron, perhaps with a blob of solder to improve heat transfer.

author: MikeK
author_rank: Super Contributor
timestamp: May 11, 2022, 02:53:36 pm
content: How about using an IR thermometer to calibrate the control knob?

author: BrokenYugo
author_rank: Super Contributor
timestamp: May 11, 2022, 03:45:15 pm
content: This is not something I would expect to drift enough to matter at all unless you're building space grade hardware or whatever. That said if you want a standalone tool for occasional use eBay is full of em, search "soldering iron thermometer", Hakko 191 and FG-100 knock offs, for $20-25 USD. I don't own one but in my experience these cheap little tools tend to do what they claim and it's really just the thermocouple fixture and a digital thermometer to read it, pretty hard to screw up.

author: jonpaul
author_rank: Super Contributor
timestamp: May 13, 2022, 10:54:35 am
content: Bonjourbest method is a thermocouple and temperature meterWe use Omega TC type K and Fluke TC meterIR probes are not accurateJon

author: tepalia02
author_rank: Regular Contributor
timestamp: May 13, 2022, 11:05:16 am
content: I think this video may give you some suggestions:
recommend me a budget milliohm dvm/dmm - Page 1
Forum section: electronics / beginners

author: Mad Professor
author_rank: Regular Contributor
timestamp: January 12, 2013, 03:42:19 pm
content: Good day all.I am starting to get back into electronics, and as such I need to start getting new test gear.I am currently out of work so trying to get new test gear on a low budget.All the DVM/DMM I have owned in the past, have the min range of 200ohm.I quite often am finding my self testing low resistance items, <20ohms.My current DVM/DMM is a UNI-T UT58C, but I really need to have the readings to a resolution.So can anyone recommend me a budget milliohm dvm/dmm that I can get hold on here in the UK.Thanks for your time.Best Regards.

author: Chipset
author_rank: Contributor
timestamp: January 12, 2013, 04:31:27 pm
content: For milliohms, unless you wanna drop some serious cash for a 5 1/2 digit handheld multimeter, you'll probably want to get yourself an older bench multimeter with 4 wire kelvin bridge measurment capability, like the HP 3478A.Check ebay, you shouldn't have any trouble finding old test gear there.

author: Mad Professor
author_rank: Regular Contributor
timestamp: January 12, 2013, 04:43:00 pm
content: When you say "serious cash" what are we talking about?

author: quarks
author_rank: Frequent Contributor
timestamp: January 12, 2013, 05:46:47 pm
content: If you also think of building a quite good solution yourself, have a look at thishttps://www.eevblog.com/forum/projects/milliohm-resistance-adapter/msg170984/#msg170984

author: M. András
author_rank: Super Contributor
timestamp: January 13, 2013, 09:50:06 pm
content: 5 1/2 digit handheld? you meant 4 1/2??? those are not that cheap but cant beat the 4 wire measurement of a bench meter

author: Lightages
author_rank: Unknown
timestamp: January 13, 2013, 11:40:28 pm
content: Maybe one cheap solution, depending on the accuracy and minimum value you want to read, the Uni-T UT61E. Being a 22,000 count meter it will read down to 10 milliohms. Granted the accuracy will be horrible down that low, but it gets you reasonable accuracy at 1ohm. ±0.5% +10 digits. It is a reasonable meter for almost any use too except higher than 250V for around $60USD. I am sure it is available in the UK or online shipped to the UK. dealextreme.com has it.Another more expensive option might be a Brymen 50,000 count meter. A Brymen BM857A can be had for around $110 EU and will again read down to 10 milliohm but with accuracy on ±0.1% +6D. It is also a much better meter in every other aspect compared to any Uni-T for build and safety.If you want REAL accuracy in the milliohm range, well be prepared to watch ebay for the random bargain in a 6.5 or more used bench meter, or spend some big money.
Recommend me a crimping jaw for 1.25T connector - Page 1
Forum section: electronics / beginners

author: sairfan1
author_rank: Frequent Contributor
timestamp: June 22, 2022, 03:50:22 pm
content: Hi, I bought lots of 1.25mm spacing connectors and reed for wire crimping into ithere are the store item referenceshttps://www.aliexpress.com/item/4000037003464.htmlhttps://www.aliexpress.com/item/4000040079038.htmlFor wire crimping I bought the jaw SN-2549 0.08-1mm2(28-18AWG)https://www.aliexpress.com/item/1005002401754690.htmlbut its smallest section is still too big for 1.25mm connector, I want to know if someone has gone through this can you please recommend me jaw model?

author: Terry Bites
author_rank: Super Contributor
timestamp: June 22, 2022, 05:21:22 pm
content: I bought an Iwiss, I a bargain and I haven't regretted it so far.Time will tell. Works fine on my JSh**t pins.iwiss.com/products/iwiss-iws-3220m-micro-connector-pin-crimping-tool/Or a Molex picoblade 63811-0000 tool. Only $2000+tax.

author: sairfan1
author_rank: Frequent Contributor
timestamp: June 27, 2022, 03:57:06 pm
content: Is there some Chinese low cost solution?there is collection of JAWs i was looking for if someone by chance had 1.25mm crimping
Recommend me Power Management IC - Page 1
Forum section: electronics / beginners

author: sairfan1
author_rank: Frequent Contributor
timestamp: October 05, 2023, 07:38:59 pm
content: I was looking at TI application notes where they mentioned an IC (without any number) for power management. Those were genaric notes for low power batrery operated devices.I understand these ICs keep track of voltage when battery gets weak that it can't provide stable current these ICs turn off the curcuit, I believe they are installed in the curcuit before LDO.I want to use such IC in my device that I'm planning to design, it will be operated at 3.3v at approx 100-150mA I wish if someone could recommend me some IC.

author: cortex_m0
author_rank: Regular Contributor
timestamp: October 05, 2023, 11:18:37 pm
content: There is a genre of undervoltage lockout chips, which you could connect to the ENABLE input of your LDO. MAX809 and MAX810, for example.There are other choices.

author: sairfan1
author_rank: Frequent Contributor
timestamp: October 06, 2023, 04:43:30 pm
content: Can someone please explain a little bit in common scenario how we can use it and what are the common chellenges

author: temperance
author_rank: Super Contributor
timestamp: October 06, 2023, 07:01:38 pm
content: MOst micro controllers do have such a circuit build in. No need to waste power in a battery operated device by using an external under voltage lockout.To answer your question about what those things do:https://www.ti.com/lit/an/slva769a/slva769a.pdf?ts=1696594649267&ref_url=https%253A%252F%252Fwww.google.com%252F
Recommend me two silicons for CRT neck board fixation and support capacitor - Page 1
Forum section: electronics / beginners

author: jeremybh1
author_rank: Contributor
timestamp: August 07, 2023, 02:48:17 am
content: Hi everyoneMy part time repair business has me look at CRT monitors and I'd like to apply silicon fixation between the tube pins and neckboard. Was usingDow Corning 738but it's priced to infinity and out of stock all the time.Needs to be mostly firm but not cement like in curing as it will need to be cut through maybe once more for the next service tech. Ideally to be stocked in Australia but I order from Digikey all the time. I would prefer a non-caulking gun product so I can store the tube in a drawer.Secondly I need to apply vibration support to capacitors in high frequency output stages, studied rationale is helps reduce cracked joints over time. Hot glue from factory is a concern for me as something like a Mac Plus doesn't have a fan, said caps are at the top of the case so the most heat. I see videos where a resin-y product is dispensed for a variety of reasons but never quite caught the best one to buy
Recommend overcurrent protection circuit - Page 1
Forum section: electronics / beginners

author: tm
author_rank: Newbie
timestamp: December 17, 2018, 06:10:32 pm
content: Hi all - I have been following EEVBLOG for a while and glad to post my first question here.I am trying to add overcurrent protection (and nice to have voltage protection) circuit to one of my design to limit them to 12V and 1.5A. I did some research on using fuse, PTC and protection circuit and wondering if I can have a guidance. I think PTC is too slow and prefer not to use one time use fuse (though, it is ok for my application).So, I am looking into find a protection IC that I can use. I find many of them and don't know which to choose from so I am wondering if there is such a jelly bean part for this?

author: spec
author_rank: Frequent Contributor
timestamp: December 18, 2018, 01:10:02 am
content: Hi tmOne of the simplest over-current protection devices is a resettable fuse. The data sheet for a popular range of resettable fuses is here:https://www.bourns.com/docs/Product-Datasheets/mfmsmf.pdfIf you then put a power zener diode across the voltage rail after the fuse you will have over-voltage protection too. An alternative to a power zener diode, is a low power zener diode (normal) and a power transistor.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 18, 2018, 08:30:38 pm
content: What's the power source? Load? Allowable peak current? Response time?Example, a small SMPS source probably won't deliver enough fault current to clear a fuse. But it's current limited anyway, so it doesn't matter.If you don't know the answers to these questions, then to what end are you looking? If it's protecting wiring, any fuse will do. if it's protecting transistors, an active current limiter (or voltage crowbar, as the case may be) is needed. There's an answer for everything, but finding the correct one requires more information.Tim
recommend parts for low cost numeric LCD - Page 1
Forum section: electronics / beginners

author: spacedog
author_rank: Newbie
timestamp: November 29, 2014, 02:43:11 am
content: Hi folks...I want to add a low cost, low powered, small numeric LCD to my design. I picked up some of these:http://www.mouser.com/ds/2/244/LCD-S401M16TF-81382.pdfand breadboarded one to find the input scheme to be pretty complicated. I then has difficulty finding a SPI or 12C controller for this display.can you guys recommend a user friendly, small numeric display/controller combo.

author: Paul Price
author_rank: Super Contributor
timestamp: November 29, 2014, 02:57:28 am
content: This LCD uses direct drive, must connect to a custom LCD-Driver IC, does not use I2C and requires AC for direct drive of LCD segments.Too complicated, find a LCD with a simple serial interface or find one with a parallel interface or I2C. There are plenty to choose from and they work using very low power.

author: Psi
author_rank: Super Contributor
timestamp: November 29, 2014, 03:01:00 am
content: If you want to display a analog value you might be better off using one of the many cheap analog LED meters you can buy on ebay. (They make LCD ones too.)You simply give them power and a analog signal.If you don't care about absolute accuracy you could even use a MCU pin to generate the analog value using a LC filter on a PWM signal.

author: miguelvp
author_rank: Super Contributor
timestamp: November 29, 2014, 03:12:29 am
content: Not really cheap but not pricey at $3http://www.wayengineer.com/index.php?main_page=product_info&products_id=2326I have one but haven't used it yet, but the code that is available on the link looks straight forward plus it has the schematic as well.Also it has a dot in the last digit.

author: spacedog
author_rank: Newbie
timestamp: November 29, 2014, 04:05:04 am
content: thanks for the suggestions guys.it's for a compact watch sized remote control device that can be set to a mode numbered between 0 and 128I found this one, it uses static inputs but is a little bigger.http://www.mouser.com/ds/2/244/LCD-S2X1C50TR-81244.pdflooks like I can run this from a couple of shift registers.
recommend such a program - Page 1
Forum section: electronics / beginners

author: greenJames
author_rank: Newbie
timestamp: April 29, 2013, 09:52:25 am
content: Hello I thought I would Introduce my selfI'm new to electronics and really greenI'm attempting to make a solar tracker this summer with my 12 year old son .Last year we made a CNC Router and that was fun so this year I thought I would put it to good use and make a solar tracker with it (small one to start with) and Then a bigger project after a successful project.so I've found a circuit for the project and need to cut this out with the aid of a free PCB program that will convert the drawing to DXF file format can you recommend such a program for this task.James and his son

author: Memphis
author_rank: Contributor
timestamp: April 29, 2013, 10:30:27 am
content: Free version ofCADsoft eagleis limited only in size of PCB, which can be enough for you. Also for that eagle you can downloaddxf.ulpexport script, which will export selected layers to your DXF file.
recommend Tool for testing USB  - Page 1
Forum section: electronics / beginners

author: smoothtalker
author_rank: Regular Contributor
timestamp: August 30, 2014, 01:30:42 pm
content: is there a device similar to this USB Tester? I need a device/PCB with USB A male and female connector. For e.g i would use it to test Apple USB charger. connecting the usb tester to the apple charger and then my iphone to the usb tester. With this, i could poke around the circuit without taking apart anything.Is there such a tool? Thankshttp://friedcircuits.us/50

author: Pedram
author_rank: Regular Contributor
timestamp: August 30, 2014, 02:08:19 pm
content: build your owntoo easy.

author: DanielS
author_rank: Frequent Contributor
timestamp: August 30, 2014, 02:09:16 pm
content: Sounds like all you want to do is be able to tap into USB signals. You could simply take a short $2 USB extension cable and open it somewhere in the middle to access the wires.

author: smoothtalker
author_rank: Regular Contributor
timestamp: August 30, 2014, 02:51:35 pm
content: Quote from: DanielS on August 30, 2014, 02:09:16 pmi would prefer something robust and stable and easy to work on just like the usb tester, so that i can poke around using dmm or other tools. also i don't want to add any resistance to the circuit

author: sacherjj
author_rank: Frequent Contributor
timestamp: August 30, 2014, 03:00:42 pm
content: First, there is NOTHING you can add to it that won't add a little resistance.Second, robustness is all in how you build something. If this was a one off, I would zip tie cable ends to the edges of a PCB. Solder power lines to a probe point. Include a 0.1" header that you can put a jumper on to allow the +5V through, or drop an ammeter on to measure current. Then have two points where data lines can be sampled.

author: charlespax
author_rank: Regular Contributor
timestamp: August 30, 2014, 03:03:53 pm
content: Here's abreakout board. I prefer this pin layout. It uses a full sized connector, which can be more robust.
Recommendation on EE books - Page 1
Forum section: electronics / beginners

author: dpapa1876
author_rank: Newbie
timestamp: June 16, 2016, 01:29:21 am
content: Here is my EE curriculum I would like a recommendation of books both technical and theoretical that would guide me throughout the whole course. I strongly ask for more technical books as engineering is more of a technical field.

author: retrolefty
author_rank: Super Contributor
timestamp: June 16, 2016, 01:32:07 am
content: The Art of Electronics would be my first choice.

author: Ammar
author_rank: Regular Contributor
timestamp: June 16, 2016, 02:16:33 am
content: High Voltage Engineering Fundamentals, Kuffel, Zaengl and Kuffel is a great handbook to have if you are interested in HV.

author: yashrk
author_rank: Frequent Contributor
timestamp: June 16, 2016, 05:36:21 am
content: There is never one perfect book for everyone. To find one for yourself do this -1. Find a topic that interest you but you don't understand it yet.2. Go to a library or a book shop read the decided topic from each book.3. One of those books will just click. Thus, you know which one to buy.You can do the same thing online too, most books have few chapters/ pages free to read online.And sometimes you just have to buy a whole lot of books, just because you understand one topic from one book and for another topic you have to refer another book.For eg. The concept of transistors and opamps in Art of Electronics just clicked, but for other topics, I just couldn't understand them.Hope this helps!

author: ez24
author_rank: Super Contributor
timestamp: June 16, 2016, 06:42:57 am
content: If you go through this carefullyhttps://www.eevblog.com/forum/beginners/electronics-primers-course-material-and-books/you may find some legal pdf booksif you can find two or more then it would pay to get a binder

author: juanfermed
author_rank: Regular Contributor
timestamp: June 16, 2016, 10:04:34 pm
content: Analog SEEKrets, by Leslie E. Green. This is probably not a beginners book, but a very well-written excellent book that is worth reading very thoroughly. To me is a very invaluable resource of practical engineering and scientific knowledge. It is available here at the forum for free from the author (you can make donations to him).I highly recommend you to read this book, some topics might be advance, but the knowledge-from-experience you will get is simply worth all the money in earth.

author: damn_dirty_ape
author_rank: Contributor
timestamp: June 18, 2016, 03:30:25 am
content: Theres a lot here. Is this for a traditional school / university? If it is, I'd wait until you find one of the chosen materials deficient before you go looking for additional materials. And honestly, youtube is one of the best sources for information on the lower-level stuff. If you need help in classes that are highly specialized, make friends with the grad students.

author: dpapa1876
author_rank: Newbie
timestamp: June 18, 2016, 04:23:15 am
content: Quote from: damn_dirty_ape on June 18, 2016, 03:30:25 amIt's a university of applied sciences, it's more practical oriented than theoretical university/college.
Recommendations for a general schottky diode? - Page 1
Forum section: electronics / beginners

author: Dan123456
author_rank: Regular Contributor
timestamp: November 24, 2023, 11:31:32 am
content: Hey thereWas just browsing through Digikey as need to place an order for some bits and pieces and got to looking at schottky diodes.As I don’t have any in my stock pile currently, I figured grabbing a few might not be a terrible idea?That said, I have no idea what is what here so thought I’d pick your guys brains firstFor some general ones just to have on hand, should I just grab a hand full of cheap 100V 1A ones?Sorry in advance for what is probably a dumb question! I wan’t sure if this is a 1N400X situation where just grabbing the highest voltage option is best, or if this is another inductor situation and I shouldn’t bother until I actually need it and then pick the one to suit the application type dealThanks once again for your time all

author: wraper
author_rank: Unknown
timestamp: November 24, 2023, 11:37:39 am
content: Higher voltage rating also comes with higher forward voltage.

author: Psi
author_rank: Super Contributor
timestamp: November 24, 2023, 11:39:25 am
content: Usually when you want a Schottky is either because you want either low voltage drop or a fast diode.Schottky diodes over 100V are less commonly used.If you want low voltage drop then you also need to consider the max voltage of the diode because the really low voltage drop diodes are also low voltage diodes.eg with the popular 1N5817,1N5818,1N5819 series you can see in the datasheet as the voltage drop gets lower/better the max voltage also gets lower.The 1N581x series is a good diode to have around, I normally just get the 5819 version since its more useful for a wider range of things, up to like 24V rails with some good safety margin

author: Dan123456
author_rank: Regular Contributor
timestamp: November 24, 2023, 12:02:39 pm
content: Quote from: Psi on November 24, 2023, 11:39:25 amAh perfect!Thank you so muchI was only thinking about the fast recovery side and hadn’t thought about the low voltage drop uses!Looks like the 1N5819’s are the winner’s as a general purpose Schottky thenThank you so much once again

author: Psi
author_rank: Super Contributor
timestamp: November 24, 2023, 12:06:02 pm
content: Quote from: Dan123456 on November 24, 2023, 12:02:39 pmThere's probably something newer/better, but the 1N581x is a jellybean part.You can get diodes with even lower voltage drop than the 1N5817 for really low voltage stuff, like under 5V.But yeah, everyone should have a supply of 1N5819 and 1N4007 diodes to cover schottky and normal.1N4148 is another general purpose jellybean fast diode for low current stuff.Also useful to have some higher current diodes, like 3A in both schottky and normal, if you think you might need them.
recommendations for good free pcb software routing software? - Page 1
Forum section: electronics / beginners

author: LordHexahedron
author_rank: Contributor
timestamp: March 01, 2016, 09:50:46 am
content: so I tried a few softwares - expressPCB is one, but it only supports one website and not the website I wanted (or indeed not even support for printing it out for DIY pcb)I also tried AutoTRAX DEX but it never even started, it just sat as a dead process never really doing anything at all.So now I come here, what are a few good free PCB designing software that doesn't have a lot of arbitrary limitations (board size, max traces or other silly design constraints) that supports exporting to commonly supported formats?

author: Rerouter
author_rank: Super Contributor
timestamp: March 01, 2016, 09:53:08 am
content: i would say kicad, i tried geda, didnt work for me,I will say, if you start on kicad, get the hang of the component creation tool, once you know most of that, its very robust

author: LordHexahedron
author_rank: Contributor
timestamp: March 01, 2016, 10:14:19 am
content: right, component creation tool - I'll have to remember that for more complex builds, don't think I'll need it for the first few boards I'll produceJust some simple interface boards so I can finish up a couple projects - it's kinda dodgy to just hardsolder 40 wires when I can make a small daughterboard and solder an FFC connector to it and connect the component to that, way cleaner and less error-prone (and faster, soldering an FFC connector is so much faster than soldering 40 individual wires)anyway, before I digress too much - thanks for the recommendation, I'll have a look at it and see if I can figure out the component designer tool

author: Eric_the_EE
author_rank: Contributor
timestamp: March 01, 2016, 04:24:35 pm
content: I've used each of these. They are fairly well known in the industry and the free versions are very good.http://kicad-pcb.org/http://www.cadsoftusa.com/download-eagle/freeware/http://www.orcad.com/My favorite is Kicad.

author: vitormhenrique
author_rank: Unknown
timestamp: March 01, 2016, 06:19:44 pm
content: I used freerouter when it was an online service, but now that it is offline you can run locallyhttps://github.com/freerouting/freeroutingIt worked fine for me.
Recommendations - Game Console PCB Preheater (ideally under $500?) - Page 1
Forum section: electronics / beginners

author: ParadiseBurn
author_rank: Newbie
timestamp: June 16, 2021, 04:02:54 pm
content: Hi there, new to forums and hoping for some advice. I searched for some recommended preheaters in the forum search but most of what I am seeing is a bit out of my price range. I am looking for a PCB preheater primarily for game console repair. I currently use a Quick 861D Hot Air Rework and a Weller WT2 with Tweezers and Iron and would really like a clean simple preheater, ideally under $500.I looked over a few of the recommendations on the forums (Weller WHP-3000 for example) but I am hoping there might be a more cost effective alternative. Any help is appreciated and thanks in advance!

author: soFPG
author_rank: Frequent Contributor
timestamp: June 16, 2021, 06:21:29 pm
content: I was looking for the same thing a week ago because it was quite a struggle to get large BGA chips off a board with nothing but hot air.In the end I bought one of those well known cheap chinese hot plates with temperature control (20x20cm area).

author: pyr0boy
author_rank: Newbie
timestamp: June 16, 2021, 06:38:47 pm
content: Depending on how hacky you like it, and how hot you want it, you could do what I did, add 8 100w 1ohm resistors to a aluminium plate.A couple of stand offs, or a bracket of some sort to keep it off the bench, and depending on the way you wire it, I can easily heat a board enough to melt lead solder.I have it wired as 2ohm, and with a supply of 45vdc I can heat up to 200°C within a minute or so, running at 10vdc keeps it at a constant 130°C.Generally you can get a cheap 200mm x 200mm x 5mm aluminium plate on ebay etc fairly cheaply.Although mine is 100mm x 200mm x 3mm because I already had the scrap aluminium.The other option I considered was using a 400mm square 3d printer mains rated heat pad, as they can easily maintain over 100°C, with a matching plate, that would be a cheap option for larger work.
Recommendations on reball station at a decent price?? - Page 1
Forum section: electronics / beginners

author: wadmancpu
author_rank: Contributor
timestamp: September 19, 2019, 12:31:30 am
content: Hello all, I'm looking into getting a reball station. I had one years ago and I'm finding that another one would be helpful. As most I'm on a budget so I'm looking for the biggest bang for the buck. Its been awhile but I think I had the Achi IR6500. I see its available for under $600. Any good? Other recommendations would be appreciated. Thanks!
Recommended bench power supply for beginning hobbyist - Page 1
Forum section: electronics / beginners

author: pkilcoyne
author_rank: Newbie
timestamp: August 20, 2015, 03:44:06 pm
content: Hello all,I'm a qualified electronic engineer who's worked in computer networking/ Cisco for the last 15yrs. Recently I've gotten back into electronics from a hobbyist point of view, I've bought a scope and now I'm hoping to add a bench power supply.Can anyone recommend a decent bench power supply, dual output preferably, that I might buy to suit the general hobbyist considering budget and also that I'd like to only have to buy once.Many thanks,Paul

author: Stray Electron
author_rank: Super Contributor
timestamp: August 20, 2015, 05:00:40 pm
content: You don't show where you are in the world and their are different brands in different countries so it's difficult to make a brand recommendation for you. Also it depends entirely on what you planning on working on. A guy building Tesla coils will need a different power supply with very different capabilities than someone that collects 1960s transistor radios! But my suggestion is that you look for a used HP or other major brand power supply that has documentation and parts available. That pretty well leaves out anything made in China! You can buy used HP (and others) PSUs on E-bay and Craigslist for next to nothing due to their weight and subsequent shipping costs. Find one near you and go pick it up in person and save a ton of money. I have used HP supplies that I've bought off of E-bay for as little as $10 that still work great and are nearly 50 years old! I recently bought a HP 6114APrecisionPower Supply for $10 that was made in 1976 and it's accuracy is dead on! This thing is well build enough that it will probably last forever but if it fails, parts and documentation are readily available for it.PS I also strongly recommend a power supply that has both constant voltage and constant current modes and that has adjustable current limiting! I repair a LOT of electronic items and it's nice to be able to set the current limit and not to have to worry about burning up an item that may have shorted caps or other problems in it.If you're like me and work on a wide range of equipment, you'll probably eventually find yourself with a closet full of power supplies! Mine range in size from little bitty 0 to 20 volts and 400Ma to others that output 100 amps and others that go to 2000 volts!