hybridfree/eevblog-posts huggingface dataset:
Need Help yihua 862BD+  2in1 solder iron will not heat up  - Page 1
Forum section: electronics / beginners

author: RespawnRestricted
author_rank: Newbie
timestamp: August 10, 2019, 03:01:18 pm
content: |OI need some help. I just bought a yihua 862BD+ 2in1 station and the solder iron was working fine for about half a hour . I set it down and went to use it again within 30sec and now the iron will not heat up no matter what way I change the temp. It seems like it's in some kind of sleep mode. We're the temp usually is now just says 30 and their is a . In lower right it seems to count up but no matter how long I let it sit I can not get it to work again. It must be a setting issue I hope but I for the life of me can't figure this out no matter wat combination of buttons I press.And yes I know it's prob just something completely easy that I'm missing lol. Please help thank you

author: RespawnRestricted
author_rank: Newbie
timestamp: August 10, 2019, 06:01:00 pm
content: To break it down simple. it seems to be stuck in a sleep mode or something and u dk how to get to out to start ramping up the solder iron .. does anyone with this type of solder iron know how to fix it

author: electricMN
author_rank: Regular Contributor
timestamp: August 10, 2019, 07:44:56 pm
content: Did you try cycling the power to the unit to see if it would exit the mode it's stuck in?

author: RespawnRestricted
author_rank: Newbie
timestamp: August 10, 2019, 08:04:06 pm
content: Ya turned it on and off a bunch left it unplugged for hours changed fuse in back all that and still stuck in sleep mode thing

author: RespawnRestricted
author_rank: Newbie
timestamp: August 10, 2019, 08:44:38 pm
content: I just said screw it and am gonna return it was gonna get one of knock offs that uses the t12 style tip. Does anyone have any suggestions on what one to get ??. Has to be on Amazon bc I got a credit

author: bc888
author_rank: Regular Contributor
timestamp: August 12, 2019, 10:21:51 pm
content: Well, they say "buy once, cry once" and suggest the highly regarded Pace ADS200.https://www.amazon.com/PACE-ADS200-AccuDrive-Soldering-Tip-Heater/dp/B07DX7DGRL/ref=sr_1_2?keywords=pace+200+soldering&qid=1565648371&s=gateway&sr=8-2You do a search on Eevblog and you'll see that it's well loved. The "buy once, cry once" in this instance comes in at $247.99

author: electricMN
author_rank: Regular Contributor
timestamp: August 12, 2019, 11:17:12 pm
content: Did you take the cover off to see if the wiring to the soldering iron connector has a loose wire? Or if the connector for the cable harness from the PC board to the soldering iron connector is well attached to the connector on the PC board?I have the 862D+ and it works quite nicely for me. I made some mods to the incoming AC power wiring because of the neutral wire being fused instead of the hot wire. This is a well known problem with these soldering stations.
Ironless linear motor - how to lower the voltage - Page 1
Forum section: electronics / beginners

author: cmcraeslo
author_rank: Regular Contributor
timestamp: November 15, 2018, 07:35:18 am
content: Hello.I have ironless linear motor (magnets on the side and 3 coils that slide between the magnet tracks) that has 1/m/s at 30V with peak force of 200N. What I want to do is to make the same power and velocity at 12V. Let's assume that I have a driver and a 12V source that is capable of 100A. How would I size the coils? How many turns, what diameter, topology to use? Is there a calculator on the internet that would give me rough numbers to start with?

author: spec
author_rank: Frequent Contributor
timestamp: November 15, 2018, 08:45:34 am
content: + cmcraesloI assume that you are talking about DC and not AC power. Also, can you post the maximum current that the LM consumes.The force is calculated by I * number of turns, where I is the current flowing through the coils.Rather than reduce the number of turns and use heaver gauge wire, which would be problematic, why not use a switch mode power supply to convert 12V to 30V.

author: cmcraeslo
author_rank: Regular Contributor
timestamp: November 15, 2018, 08:53:45 am
content: Yes, I'm talking about DC power.I don't want to add complexity and cost to the product. I also want the product to be as efficient as possible. I guess by lifting the voltage, I also add a lot of possible points of failure to it. Not to mention boosting the voltage with those amps...You mentioned this would be problematic? Why's that?

author: spec
author_rank: Frequent Contributor
timestamp: November 15, 2018, 11:34:41 pm
content: Quote from: cmcraeslo on November 15, 2018, 08:53:45 amOK, thanksQuote from: cmcraeslo on November 15, 2018, 08:53:45 amFair points!Can you give a figure for the amps as requested.Quote from: cmcraeslo on November 15, 2018, 08:53:45 amI know very little about linear motors on the practical side, but in general winding motors, especially high power types, is a specialist business and is best done by a company with the expertise, especially as the motor seems to be high power
Irrigation timer not working properly - Page 1
Forum section: electronics / beginners

author: Godzilla
author_rank: Contributor
timestamp: May 20, 2021, 11:06:03 am
content: Hello guys, I have this irrigation timer that is not working properly when I set the run time above 10mins, for example if I set it to run for 90 minutes every 24hrs it will just close itself after 29/30mins. It uses a pic microcontroller but I can't understand the circuit exactly, I think that it uses internal timers to count the time based on the selectors, but what can make it count in the wrong way when I set an high run time?

author: Zero999
author_rank: Super Contributor
timestamp: May 20, 2021, 12:47:30 pm
content: It's highly unlikely the microcontroller is faulty, otherwise it wouldn't work at all.The switches are the most likely parts to fail. Firstly try contact cleaner, to remove any grease.

author: amishasingh
author_rank: Contributor
timestamp: May 20, 2021, 01:35:18 pm
content: And how about the supply is it coming as required to your circuit

author: Godzilla
author_rank: Contributor
timestamp: May 20, 2021, 04:43:20 pm
content: Quote from: Zero999 on May 20, 2021, 12:47:30 pmIve cleaned all the contacts and the board, but it still doesnt work properly.Quote from: amishasingh on May 20, 2021, 01:35:18 pmThe supply comes from a two new AA batteries in series, and it seems to be present in the circuit without problems...
Is 2 diodes = 1 SCR? - Page 1
Forum section: electronics / beginners

author: ali6x944
author_rank: Frequent Contributor
timestamp: May 04, 2016, 04:53:18 pm
content: Hi everyone,I was reading about SCR recently and I saw the internal structure of an SCR and how people were able to get the same functionality with transistors so this got me wondering if that could be possible with a pair of diodes in series ?

author: Wobbegong
author_rank: Newbie
timestamp: May 04, 2016, 04:56:19 pm
content: Better to use coupled PNP/NPN transistors like they show in the wikipedia article on SCRs.

author: danadak
author_rank: Super Contributor
timestamp: May 04, 2016, 05:02:22 pm
content: No to 2 diodes in series, you need a mechanism that has V trip point andpositive feedback.http://electronics.stackexchange.com/questions/141987/how-can-i-create-an-scr-using-a-pnp-and-npnRegards, Dana.

author: ali6x944
author_rank: Frequent Contributor
timestamp: May 04, 2016, 05:16:15 pm
content: Oh what a bomber, I was realy excited when I first thought about it, but thanks for explaining I really think a two diode SCR would be a slick thing thuo

author: nogood
author_rank: Contributor
timestamp: May 04, 2016, 11:14:19 pm
content: Two diodes in series wouldn't work, you need a semi-conductor junction, not a piece of wire in between
Is 50C a normal temperature for TL074 (and other IC's) ? - Page 1
Forum section: electronics / beginners

author: K3mHtH
author_rank: Regular Contributor
timestamp: August 03, 2020, 12:33:19 am
content: Hey everyone,So I recently got my first prototype back on an audio board that I've been working on. This one is all SMT stuff and is twice as dense and complicated as the TH board I did previously.A friend had lent me his FLIR temperature camera and I thought it would be interesting to check my new board with it. The images show that every single one of my IC's are reaching around 50C within 20 minutes. Almost all of these ICs are TL07x and my ambient air is around 25C. I'm powering these chips with +/-15V DC supply.I did notice the board was getting warm to the touch, something I never noticed with the old TH board. But wasn't expecting to see temperatures that high. Looking at the datasheet for the TL074, it says that the Maximum Operating Temperature is 70C.I don't think I'm doing anything wrong with with the circuit design, it's all bog-standard op-amp stuff.. they're all feeding subsequent opamp stages that are at least 100k impedance and often more. No oscillation is showing on the scope, every gain stage has a capacitor in the feedback loop also to deter this. Every single op-amp chip is reaching the same temperature at the same time.. so I'm likely thinking this isn't a problem at all, but I did want to check before moving ahead.

author: wraper
author_rank: Unknown
timestamp: August 03, 2020, 12:41:07 am
content: Quote from: K3mHtH on August 03, 2020, 12:33:19 amIt's ambient temperature, not case temperature. @30V supply voltage 1.4 ma current per opamp gives 0.17W heat dissipation for 4 opamp IC. So 25oC above ambient temperature sounds about right.

author: David Hess
author_rank: Super Contributor
timestamp: August 03, 2020, 01:09:35 pm
content: The thermal resistance of the SO14 package is 86 C/W and the quiescent current is 1.4 (2.5) milliamps per amplifier so 168 (300) milliwatts at 30 volts. That produces a temperature rise of 14.5 (25.degrees C above ambient even before amplifier loading is considered so 50 degrees C is reasonable. Note that this means that the input bias current will be more than 4 times higher than the typical specification because of the JFET input stage.Sometimes designs use the minimum possible supply voltage for the application to lower power dissipation.
Is "star Vin" used or useful at all? - Page 1
Forum section: electronics / beginners

author: anfang
author_rank: Regular Contributor
timestamp: September 23, 2016, 09:47:50 am
content: The "star GND" configuration is used to avoid ground loops, gain RF immunity and lower resistance/inductance of the circuits.The existence of star ground makes me wonder is there is a counterpart for the input voltage. Are "star Vin" configurations used in real-world circuits? What are they useful for?

author: JPortici
author_rank: Super Contributor
timestamp: September 23, 2016, 10:17:06 am
content: Yes.For example, one voltage regulator outputs 3.3V. at the regulator output you have one line going to the digital supply and another one to the analog supply, maybe with beads/inductors as an additional filter. just as with ground linesthe idea is to confine all the noise/crap into a specific path
Is a CC DC-DC converter short circuit proof? - Page 1
Forum section: electronics / beginners

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 28, 2016, 02:58:01 pm
content: Hello!So... i have a general question, i am far from a bloody beginner but i have my problems with some things.Should a DC-DC converter with a constant current output not be short circuit proof by design?I have this cheap chinese Minghe converter and the seller says that it is not short proof.But... if it is current limited, should it not be by design short cicuit proof?This perticular unit is a Buck/Boost, is that maybe the reason for it?Greetings,Peter

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 28, 2016, 03:15:52 pm
content: If it is true constant current, yes, however in practice it may not give constant current over its whole output voltage range.e.g. a LED flyback boost driver would give CC as long as Vout>Vin, but below that, Vin would be connected to Vout vis the inductor and diode

author: michaeliv
author_rank: Frequent Contributor
timestamp: March 28, 2016, 05:44:05 pm
content: Most likely it is specified as non-short-circuit protected because if you for example set the output to 30v and set the CC limit to maximum, short circuiting it will destroy it. So, in this case it wouldn't be short-circuit protected.

author: PeterFW
author_rank: Frequent Contributor
timestamp: March 28, 2016, 10:39:38 pm
content: Hello and thanks for your reply!Quote from: mikeselectricstuff on March 28, 2016, 03:15:52 pmSeems like i will have to do some (potentially destructive) testing.I have addet INA226 to log the voltage and drawn current from the connected devices to an SD card.Since the INA226 has a programable latching alert output i will wire a relay in series and have the output disconnect in case of over current.That should help a bit in case things go wrong.Edit: See the attachment of the module in question, the INA226 PCB is not my proudest work...QuoteThat makes sense, thank you!On a side note, i love your videos, been watching them for quite some time now! Thank you!Quote from: michaeliv on March 28, 2016, 05:44:05 pmThanks, i will wire it up and see what will happen with a suitable resistive load. It is not that cheap (20 bucks) but i guess i will have to do some destuctive testing.Greetings,Peter

author: crazy horse
author_rank: Contributor
timestamp: March 28, 2016, 10:48:13 pm
content: If it is designed right it really should be.

author: station240
author_rank: Unknown
timestamp: March 30, 2016, 01:51:37 am
content: Quote from: crazy horse on March 28, 2016, 10:48:13 pmQuote from: PeterFW on March 28, 2016, 02:58:01 pmHighlighted the proof it's not designed properly.Sadly the only way to know if these cheap chinese converters are any good is to either:1. Reverse engineer it circuit, or find someone that did.2. Run a few basic tests, and see if it blows up under normal working conditions.It's best to do #1, rather than both
Is a LED PSU suitable for other tasks? - Page 1
Forum section: electronics / beginners

author: exit_failure
author_rank: Regular Contributor
timestamp: July 26, 2018, 02:18:11 pm
content: I have a Meanwell APV-8-5constant voltagePSU (Datasheet:http://cdn-reichelt.de/documents/datenblatt/D400/APV-8-SPEC.pdf). I would like to use is to power other things like arduino nanos and the like but everywhere I look, this PSU is always only advertised for LED applications. Since it's constant voltage and not current it should - in my understanding - work like any other standard PSU. Are there any drawback or even dangers in using this supply for something else than LEDs?

author: Zero999
author_rank: Super Contributor
timestamp: July 26, 2018, 03:13:41 pm
content: It should be fine, as it's constant voltage. Just because it's designed for powering LEDs, it doesn't mean it can't be used for anything else.

author: viperidae
author_rank: Frequent Contributor
timestamp: July 26, 2018, 10:29:18 pm
content: It also has 0.25v output ripple too.Not so bad for fixed installation of led lighting.I wouldn't want to be using it for anything that needs a smooth power rail

author: JustMeHere
author_rank: Frequent Contributor
timestamp: July 26, 2018, 11:41:47 pm
content: I run computers that take a pico power supply off of LED power supplies.
Is a slight continuity beep between + and - on a AC/DC PSU normal? - Page 1
Forum section: electronics / beginners

author: rthorntn
author_rank: Frequent Contributor
timestamp: February 15, 2023, 04:48:05 am
content: Hi all,I have a Meanwell RT-125A here, it's never been used, I connected it up with no load and I get a flashing green light, I think this PSU needs some amps on the 5V so this may be the problem.But it got me checking things, so I bust out my U1272A put it on Ω and hit Shift, if I put one probe on common and the other on +5V I get a tiny beep and the display reads 45, it happens to a lesser extent on -5V but the display quickly goes to 0.I read that this could just be "Most linear supplies will show a short for a few seconds until the caps charge up from the probe's bias current. That is normal" [gearspace.com] but now I'm worried and I didn't think this Meanwell was linear (although I think I can see a transformer inside there)?Thanks.Richard

author: Kim Christensen
author_rank: Super Contributor
timestamp: February 15, 2023, 05:19:47 am
content: Unless it shows a dead short, a continuity reading on the output of a power supply is meaningless. (You'd be checking it when it's unplugged/off)Better to put some sort of a small resistive load on it, power it on, and measure the voltage across the load. Aim for a current draw of around 10% of it's rated output for a quick test. (not super critical)Doesn't look like that power supply has a minimum load requirementaccording to this datasheet.

author: rthorntn
author_rank: Frequent Contributor
timestamp: February 15, 2023, 05:58:12 am
content: I put my re:load on it, set to 2A and it worked fine!

author: timenutgoblin
author_rank: Regular Contributor
timestamp: February 15, 2023, 06:59:04 am
content: Quote from: rthorntn on February 15, 2023, 04:48:05 amAccording to the datasheet, there is a minimum load requirement of 15% of the rated output current for CH1 (5V @ 12A) which translates to:15% of 12A = 1.8A. 2A > 1.8A.I think that the reason the LED flashes is because of the minimum duty cycle capability of the PWM controller; I don't think it's low enough to regulate without a load connected to the output.
Is Switch-Mode Power Supply Connected to Power Strip Connected to Earth Ground? - Page 1
Forum section: electronics / beginners

author: Roseblade23
author_rank: Newbie
timestamp: November 28, 2019, 08:36:44 am
content: Hello everyone!I'm new to electronics, and just purchased an oscilloscope. To ensure that I don't blow anything up, I'm researching as much as I can before using it.I'm using this switch-mode power supply to power a breadboard DC circuit (Ben Eater's 8-Bit CPU), which I usually keep plugged into a power strip:https://www.jameco.com/z/EPAS-101W-05-CUI-5V-2A-10W-AC-DC-Switching-Wall-Adapter_2188537.htmlI've watched Dave's video "#279 How NOT To Blow Up Your Oscilloscope!" a couple times, and it sounds like I'm still connected to Earth Ground by doing this (plugging the SMPS into a power strip)? The power strip has the standard 3 pins. Which would be bad? Or, because the SMPS only has two prongs, I'm protected from connecting to ground through it?I got a little confused, when at 8:05 he said we're okay as long as the SMPS has no Earth connection at all.https://youtu.be/xaELqAo4kkQ?t=433Thanks for any help!

author: perdrix
author_rank: Frequent Contributor
timestamp: November 28, 2019, 09:19:36 am
content: OK It's really not too hard. If the Device Under Test (DUT) which in this case is an SMPS, has no earth connection, then it is safe to connect a 'scope probe attached to an earthed 'scope across any two points in the circuit as the one attached to the probe ground will "float" to the 'scope's earth potential.Notes:1) This doesn't mean it's safe to prod your fingers in there - even if only one - you could at best get a nasty burn if your finger touched two points of different voltage, and at worst if you had two fingers in there you could kill yourself.2) Don't connect two probe earth leads to points in the DUT with differing potential.David

author: Roseblade23
author_rank: Newbie
timestamp: November 28, 2019, 04:54:07 pm
content: Hey there,I understood about a device not having an earth connection being safe, but my concern was that I wasn't sure if my SMPS had an earth connection or not, since it was plugged into a power strip that did have an earth connection.In doing more research and asking on Reddit as well, I've learned that if the power supply has the double square symbol on its label, it means it's a Class II double insulated supply using flyback technology, and is mains earth isolated. Also, the SMPS having two prongs with no ground pin is not sufficient to determine that it is isolated (although the vast majority of the time it is) -- in North America the neutral conductor of the wall outlet is connected to mains earth at the breaker panel. So you would still be connected to earth ground if this symbol wasn't on the device.Thanks!

author: JustMeHere
author_rank: Frequent Contributor
timestamp: November 28, 2019, 06:13:28 pm
content: Do a continuity test from the AC inputs to the DC outputs. If you get no buzz then it is isolated. Most are isolated. (Unplug everything first. And make sure the supply has discharged it's caps first.)
Is allied electronics a good electronics components source? - Page 1
Forum section: electronics / beginners

author: IonizedGears
author_rank: Regular Contributor
timestamp: January 31, 2013, 02:44:45 am
content: http://www.alliedelec.com/<--The website for the company in question.Well one day i got extremely pissed because i needed a component that i just didn't have and a good amount of it too. Radioshack is the only store near me that i know for a fact sells components so i went on google maps to see if there are any other stores that didn't have radioshack's BS prices. The nearest store for this company is around 26 miles away so i would like to know do their stores actually have a good stock of components so that i could quickly purchase components and preferably cheap components as well?(do the prices go down when purchasing items in bulk?) I live in the us by the way.

author: helloworld922
author_rank: Regular Contributor
timestamp: January 31, 2013, 03:58:14 am
content: Locally where I live the allied offices don't actually carry any stock. You can place orders there, but they will have to be shipped in, at which case you may want to consider using Digikey, Mouser, Newark, etc. who I think tend to have larger stock and will sell you smaller quantities for hobby use.

author: Nirios
author_rank: Regular Contributor
timestamp: January 31, 2013, 03:59:18 am
content: Unless I am mistaken, Allied Electronics is a distributor and does not have retail stores. Their selection and shipping times have been great for me. I am not sure about their prices for components, I usually use Mouser or Digikey and Allied for non-component parts.I only use Radioshack as a last resort or if I need the part in my hand in the next 10 minutes. I'd rather wait the time it takes for parts to ship to me than endure their blank stares and questions about if I need a cell phone or batteries.

author: nanofrog
author_rank: Super Contributor
timestamp: January 31, 2013, 04:27:07 am
content: I didn't even know they had any sort of local facilities, so have only used them online with positive experiences (same for Future FWIW). I've only bought items that weren't components for personal use (equipment & accessories) from either of these vendors.For parts, I'm with others that DigiKey and Mouser are better for hobbyists.

author: bradleytron
author_rank: Regular Contributor
timestamp: January 31, 2013, 05:11:45 am
content: Quote from: IonizedGears on January 31, 2013, 02:44:45 amIf your looking for good pricing and if you decide to go with on-line ordering, Digikey, Mouser,... then I would also suggest that you carefully research any shipping costs before you place your order.
Is an ICL7107CPLZ a functional replacement for an ICL7107CPL? - Page 1
Forum section: electronics / beginners

author: cdev
author_rank: Super Contributor
timestamp: December 30, 2016, 04:19:35 pm
content: I'm repairing an old power supply and need to replace one of its voltage (and current) meter display chips, a 40 PIN DIP - the original part is a ICL7107CPL, the price on ICL7107CPLZ is lower and it seems to be more available, the older chip is marked "Obsolete" on some sites.. what's the difference, is there any? The price for a single chip range from around three dollars up.I figure that if I can (if they are cheap enough to justify it) perhaps I should get several for the lower price in case any of the other 7107s in the unit go bad in the future.Luckily its a socketed part!Thank you.

author: Monkeh
author_rank: Super Contributor
timestamp: December 30, 2016, 04:26:21 pm
content: The only difference is that the package is lead-free.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 30, 2016, 04:28:12 pm
content: The 7107cplzseem to be the lead free version. So this should be OK.This a very common ADC to drive LED displays. So chances are they are around for a few more years. Usually they are pretty reliable.

author: cdev
author_rank: Super Contributor
timestamp: December 30, 2016, 04:30:52 pm
content: Thats what I thought. Thank you.
Is BGA strictly necessary for this SDRAM application? - Page 1
Forum section: electronics / beginners

author: gabrielgcma
author_rank: Newbie
timestamp: May 18, 2025, 11:41:57 pm
content: I'm designing a digital guitar pedal and I'll use an external SDRAM for audio buffering, with a 100MHz clock. I picked the IS42S32800J in a BGA package, but as a hardware design beginner I'm finding it extremely difficult to route it.There's a TSOP-86 package available for the part, I'd like to know if there would be any issues with speed.

author: ataradov
author_rank: Super Contributor
timestamp: May 19, 2025, 01:40:49 am
content: Why did you pick BGA? TSOP II should work fine.

author: JustMeHere
author_rank: Frequent Contributor
timestamp: May 19, 2025, 05:11:45 am
content: Don't be afraid to go 4 or 6 layers.Everything these days should be at least 4. There's an ad at the top of this page for $2 6 layer prototypes.
Is Broken top/bottom ground plane ok if you have a solid interior one? - Page 1
Forum section: electronics / beginners

author: JustMeHere
author_rank: Frequent Contributor
timestamp: March 25, 2019, 12:42:43 am
content: I'm working on a 4 layer board. The stackup is top signal, 2nd gnd, 3rd +3v3, and bottom is signal.If I did a full copper pour on the top and bottom layers, will I need to worry creating loop area problems? It doesn't seem like it should as long as I keep my 2nd layer as solid as possible (i.e. vias/pin holes only) I'm trying to get better cooling for my power and main processor.

author: OwO
author_rank: Super Contributor
timestamp: March 25, 2019, 08:08:52 am
content: It is fine as long as you stitch the top and bottom ground pour to the real ground plane with a via every centimeter or so. Otherwise it's possible to get resonances depending on the shape of the ground pour.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 25, 2019, 10:21:34 am
content: I normally don't worry about outside ground fill at all, if there's inner planes.I only do that when heatsinking or current capacity is required, or -- more as superstition than proven benefit, mind -- where high precision or high frequency circuits are used.Tim

author: JustMeHere
author_rank: Frequent Contributor
timestamp: March 26, 2019, 02:49:59 am
content: QuoteHeat sinking is specifically my goal. I'm trying to cool an ESP32 and a LT3509 power supply.Thanks

author: JustMeHere
author_rank: Frequent Contributor
timestamp: March 26, 2019, 02:52:28 am
content: Quote from: OwO on March 25, 2019, 08:08:52 amExcellent answer. Thanks
Is Digilent solderless breadboard high quality? - Page 1
Forum section: electronics / beginners

author: quaternion00
author_rank: Contributor
timestamp: April 05, 2019, 07:04:53 am
content: Hi Guys, I'm planning to buy Digilent solderless breadboard. Is it high quality compared to other breadboards?Thanks.

author: agehall
author_rank: Frequent Contributor
timestamp: April 05, 2019, 07:12:01 am
content: You didn't like the answers in your other thread on the same subject so you had to start another one? Answers won't be different...

author: wilfred
author_rank: Super Contributor
timestamp: April 05, 2019, 07:25:40 am
content: I am not sure what the other thread said and I also have no idea. I would like to know what is commonly understood by high quality when it comes to breadboards. Is it the thickness of the plating, the strength to the spring that grips the wire and how long it stays strong. Or is it the rigidity of the plastic.I can easily imagine some machine in China stamps breadboards out by the millions and they all are basically similar. USA made ones if any remain might be different.There is a thread here and this post had a video which I will watch myself but haven't yet.https://www.eevblog.com/forum/beginners/who-made-the-high-quality-breadboard/msg1580989/#msg1580989

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: April 05, 2019, 07:35:27 am
content: Quote from: wilfred on April 05, 2019, 07:25:40 amYup pretty much all of the above. The brands people like are Wisher (Taiwan) and 3M/Global Specialties (USA). Haven't looked at who makes the Digilent offerings but if it is no-name then likely poor quality with added Digilent markup in price.

author: tggzzz
author_rank: Super Contributor
timestamp: April 05, 2019, 08:23:51 am
content: Quote from: wilfred on April 05, 2019, 07:25:40 amAnd that is precisely why double posting is rude and inconsiderate ofotherpeople's time.For referencehttps://www.eevblog.com/forum/reviews/is-digilent-breadboard-has-high-quality/msg2319081/#msg2319081

author: Simon
author_rank: Unknown
timestamp: April 05, 2019, 11:57:55 am
content: Please don't post the same topic twice, it's really annoying.
Is Fan Noise on SDS 5054X Very Loud? - Page 1
Forum section: electronics / beginners

author: johnwhite1000
author_rank: Newbie
timestamp: February 28, 2021, 08:50:17 pm
content: I am thinking of buying a Siglent 5054X 350 Mhz Scope and one of my concerns is fan noise. I am very sensitive. Is it very loud?

author: tautech
author_rank: Super Contributor
timestamp: March 01, 2021, 08:52:18 pm
content: Quote from: johnwhite1000 on February 28, 2021, 08:50:17 pmNo, not at all. The fan is an 80mm unit that when the scope is first powered runs at full speed but slows to a much quieter level before the boot has finished.In a quiet lab you know it is running but it is no louder than a modern PC.
Is HAKKO FX-1003 compatible with FM-206? - Page 1
Forum section: electronics / beginners

author: larjohn
author_rank: Newbie
timestamp: May 13, 2022, 05:22:36 am
content: I have some exprience with soldering with an iron, mainly for DIY stuff. I want to take the next step and invest in a couple of more professional tools. I would like to be able to work with boards that have SMD / TH components.Use cases:Solder TH componentsSolder SMD componentsDesolder TH componentsDesolder SMD componentsI really like the advertised precision ofHAKKO FX-1003hot tweezers. It says it goes withFX-100, which comes with a decent iron and there is also an alternative iron available separately.On the other hand, I would also like a desoldering tool with a pump, so that I can conveniently desolder components. HAKKO hasFM-206station which also is compatible with a desoldering tool and a hot air rework tool.I am wondering if FM-206 would work with the FX-1003 so that I can avoid buying FX-100. I understand that FX-100 does not have an air supply unit and that its compatible tools work with induction heating.I read in a forumpostfor FX-1003 that it works with a Metcal station. Is it possible for the FX-1003 to work with a Metcal but not with the FM-206?

author: m k
author_rank: Super Contributor
timestamp: May 18, 2022, 03:02:03 pm
content: It's probably more with a connection type than a manufacturer.Fixed temp or not can also mean something.Consider getting different handles for leaded and unleaded operations.
Is it a good practice to turn off a MOSFET with negative gate voltage? - Page 1
Forum section: electronics / beginners

author: hkBattousai
author_rank: Regular Contributor
timestamp: July 02, 2014, 09:06:01 am
content: I was driving a MOSFET in my project with 0V...12V gate voltage levels. Then I remembered that there was also a -5V source available in my circuit. There goes my question; does it make a performance difference (less switching losses) if I drive the MOSFET with -5V...+12V driving voltages instead of 0V...12V levels?

author: nuno
author_rank: Frequent Contributor
timestamp: July 02, 2014, 09:34:58 am
content: Hummm, I don't think it will make any relevant switching losses difference at the FET, because it will take the same time to turn ON/OFF as before (I'm considering turn ON/OFF time as the time it takes to change current and voltage which is when the FET has the core of switching losses and not the time it takes to take G-S from Von to Voff and vice-versa). It will keep the FET OFF harder (will be more immune to fast drain voltage raise) and have more latency turning ON (will take more time since the driver is commanded to turn ON to the point the FET turns ON, as there are more charge to remove from G-S), the driver will work a little harder (more charge to give/take), ...

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 02, 2014, 09:39:02 am
content: Not usually.Definitely helps for "logic level" types -- they're just normal FETs with Vgs(th) shifted down a bit, so driving one from 0...5V is much like driving a regular FET with 2...7V. More voltage swing means more current through internal resistances, and less time spent in the transition region.SiC MOSFETs are typically suggested to drive something like -2 to 20V. SiC has lower gain than Si, hence the higher swing.It is very useful for IGBTs, rarely specified on the datasheet but often required for reliable operation. Typically, +10 to +15V is used to turn on, and -5 to -10V to turn off. Very large modules are often driven with +/-15V.Tim

author: krish2487
author_rank: Frequent Contributor
timestamp: July 02, 2014, 09:57:31 am
content: What teslacoil said.It is a common practice in medium to high power levels to use a negative voltage to turn off the power device (mostly FETs and IGBTS).This is due to avoid a spurious turn with a unipolar supply, and more importantly to avoid the miller effect due to the parasitic gate-drain capacitance.The miller capacitance and the input capacitance form a voltage divider wrt the voltage across the drain-source voltage. If you use a unipolar supply, you ll mostly end up biasing the FET in it linear region and cause it to get hot and blow (in extreme cases). If you use a bipolar supply, you are likely to avoid the unwanted turn on since the gate will be likely below the threshold even after the voltage divider.

author: diegoterc3
author_rank: Regular Contributor
timestamp: July 02, 2014, 05:40:44 pm
content: You can always use drivers:IR2110 for example allows you to use 0V or -5V reference with a logic standard 0-5V logic supply. Take a look it may help you.
Is it bad to run an EL strip inveter with too much EL strip? - Page 1
Forum section: electronics / beginners

author: Starlord
author_rank: Frequent Contributor
timestamp: September 13, 2017, 06:43:32 pm
content: I'm using some EL strips in a project and I was wondering... If I load my inverter with too much EL strip, is that going to blow up the inverter, or are the panels just going to get dimmer?Unfortunately the inside of the inverter I want to know about is sealed inside a blue cube, and a second inverter I have which is much larger and in a box with screw that I was able to open is potted in black gunk, though I can see it seems to have some resistors, and what looks like some TO-220 size mosfets or transistors as well as a huge transformer. But I can't actually look at the specs for any of the parts, and I don't have a schematic to examine.I don't know a whole lot about how transformers behave (I understand they use different numbers of turns to multiply the voltage and they require AC and that's about it.), so as far as I know it's entirely possible there is a finite amount of current I can draw from this thing and the inverter is in no danger of blowing up if I draw too much.I do know it is bad to run the inverter with too little wire connected. So I always make sure to have a few feet when I'm running it. I guess that has something to do with the transformer and it somehow creating a voltage too high for the other electronics but I don't really know the mechanics of it.

author: Zero999
author_rank: Super Contributor
timestamp: September 13, 2017, 09:46:16 pm
content: The transistors normally form a self-oscillating circuit, such as a Royer converter.In a transformer, the primary current is, proportional to the secondary current. If the load on the secondary, is higher than the maximum rating, then the primary current will increase too. Higher currents, cause more heating, which will destroy the transformer, if it's too hot.

author: danadak
author_rank: Super Contributor
timestamp: September 13, 2017, 11:49:50 pm
content: The EL strip is highly capacitive, so that means more Pdiss due to CV2f dissipation.Regards, Dana.

author: amyk
author_rank: Super Contributor
timestamp: September 14, 2017, 09:17:16 am
content: It depends on whether it's a constant-voltage or constant-current inverter.

author: Zero999
author_rank: Super Contributor
timestamp: September 14, 2017, 09:41:54 am
content: Quote from: danadak on September 13, 2017, 11:49:50 pmWhat do you mean? The power loss in the transformer and associated switching transistors is I2R and is what will damage the converter. The power dissipation in the EL wire is desirable.Quote from: amyk on September 14, 2017, 09:17:16 amI would guess constant voltage, since EL wire is capacitive and doesn't need current limiting.

author: danadak
author_rank: Super Contributor
timestamp: September 14, 2017, 08:15:40 pm
content: The load is capacitive = greater load for Inverter, as you described.Regards, Dana.
NEVER MIND! - Is it cheep for siglent sds1204x-e? - Page 1
Forum section: electronics / beginners

author: FriedMule
author_rank: Frequent Contributor
timestamp: April 01, 2018, 01:44:56 am
content: I want to throw some money out for my first scope (Siglent sds1204x-e)I can bye it for 440 Euro = 542.47 USD.Is that a good price for a new on Amazone.de?

author: rstofer
author_rank: Super Contributor
timestamp: April 01, 2018, 01:49:47 am
content: It's cheaper than I can get one in the US:http://www.saelig.com/siglent-sdsx-series/sds1204x-e.htm

author: GreyWoolfe
author_rank: Unknown
timestamp: April 01, 2018, 01:57:23 am
content: Amazon, $379https://www.amazon.com/Siglent-Technologies-SDS1202X-Oscilloscope-Channels/dp/B06XZML6RD/ref=sr_1_1_sspa?ie=UTF8&qid=1522547758&sr=8-1-spons&keywords=Siglent+SDS1204X-E&psc=1

author: rstofer
author_rank: Super Contributor
timestamp: April 01, 2018, 01:59:34 am
content: Quote from: GreyWoolfe on April 01, 2018, 01:57:23 amNot the same scope - this is actually an SDS1202X-E - a two channel scope.

author: FriedMule
author_rank: Frequent Contributor
timestamp: April 01, 2018, 02:04:32 am
content: It sounds as if it is cheap then!Have to act fast, only few left.

author: FriedMule
author_rank: Frequent Contributor
timestamp: April 01, 2018, 02:17:06 am
content: SORRY never mind!!It looks like that the item was a sds1202x-e after all, type error or something?!

author: tautech
author_rank: Super Contributor
timestamp: April 01, 2018, 02:20:40 am
content: Quote from: FriedMule on April 01, 2018, 01:44:56 amYep it is cheap so just make sure you are looking at the right model.Siglent Hamburg RRP:€659https://www.siglenteu.com/digital-oscilloscopes/sds1000x-e-series-super-phosphor-oscilloscopes/
is it feasible to use an arduino Nano to program an atmega328, - Page 1
Forum section: electronics / beginners

author: samarth
author_rank: Contributor
timestamp: October 15, 2021, 01:49:41 pm
content: Title says all.I have an arduino nano, and bought an atmega.My understanding was that the atmega uses SPI to be programmed in circuit.Is it feasible for me to use the arduino nano as a sort of "Converter" between my box and the atmega?So, I start writing to arduino's serial in, and arduino streams it out to the atmega (after applying the correct opcodes).Is my understanding correct?Any possible gotchas that i may face?Regards,SR

author: langwadt
author_rank: Super Contributor
timestamp: October 15, 2021, 01:54:41 pm
content: https://www.best-microcontroller-projects.com/arduino-nano-isp.html

author: tooki
author_rank: Super Contributor
timestamp: October 15, 2021, 05:32:36 pm
content: Quote from: samarth on October 15, 2021, 01:49:41 pmWhat you use is the ArduinoISP sketch that’s included with the Arduino IDE. It’s explained nicely on the following two official pages:https://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoToBreadboardhttps://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoISPThe page langwadt posted also explains it really, really well.No gotchas I’m aware of. I own some actual ISP programmers, but have often used the ArduinoISP sketch to temporarily make a programmer when away from home. Additionally, the ArduinoISP is basically guaranteed to work; I’ve had trouble with some programmers on Windows due to drivers.

author: samarth
author_rank: Contributor
timestamp: October 16, 2021, 02:08:20 am
content: Thanks a lot. will look into them!SR
Is it important to avoid ground loops in outdoor CAN bus systems? - Page 1
Forum section: electronics / beginners

author: e100
author_rank: Frequent Contributor
timestamp: December 04, 2020, 02:36:37 pm
content: Some CAN interface boards designed for use with microcontrollers have isolation barriers and some don't. Those with isolation barriers have more components, are more expensive and physically larger. I believe the NMEA 2000 standard used on boats, which uses CAN as the transport layer, requires all nodes to be electrically isolated.In audio circuits ground loops produce annoying mains 50/60 Hz frequency signals. Is there a dummies guide that explains the pitfalls of ground loops in the context of data cables where the data rate is far higher than 50/60 Hz power supply?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: December 05, 2020, 11:00:42 am
content: CAN and RS485 are quite good at filtering out noise, but there are limits.As far as I know RS485 goes from a common mode voltage of -7V to +12V and the limits for CAN are a bit less.As long as the noise is not so big that the signals go out of this common mode range it should work. It is the magic of differential signalling.https://html.duckduckgo.com/html?q=differential+bus+noise+immunityIf you have big ground loops (for example 2 different power cables going to a PCB via different routes) and there is a strong magnetic field present, then you may have trouble with currents going round in the ground loop, and a power resistor or extra filtering may help to reduce that current.

author: Siwastaja
author_rank: Super Contributor
timestamp: December 05, 2020, 06:46:25 pm
content: Differential audio (aka balanced audio) doesn't hum in presence of ground loops, and Just Works as long as ground differences are within the common mode range of audio opamps (say, around +/-12V for example).CAN is differential like differential audio is, so the same applies.If you have high-current devices that have separate power and communication connectors, isolation of the comms may be a good idea because if non-isolated, disconnecting the power wire but leaving the communication connector provides a power path through the communication connector which may not be rated for such high current. At least use fuses to prevent damage.

author: e100
author_rank: Frequent Contributor
timestamp: December 06, 2020, 02:40:11 am
content: Thanks for both replies. It makes sense now.
Is it neccessary to buy a true RMS multimeter ? - Page 1
Forum section: electronics / beginners

author: Nhan95
author_rank: Contributor
timestamp: April 13, 2015, 03:43:04 am
content: I'm a second year student in university, and i start to learn electronics from basic to advanced. Is it neccessary to buy a multimeter with true RMS ? thanks

author: cellularmitosis
author_rank: Unknown
timestamp: April 13, 2015, 05:11:24 am
content: If this is your first meter, I wouldn't worry about it.I find that anytime I care enough about a signal to need true RMS, I need an oscilloscope anyway...If you are in the market for a cheap meter, one of the forum members here has an ebay store out of hong kong:http://stores.ebay.com/99centhobbiesTake at look at the UNI-T UT61-E (which is true RMS, and has serial out), or the (cheaper) Digitek DT-4000ZC (which has serial out, but is not true RMS).

author: Lightages
author_rank: Unknown
timestamp: April 13, 2015, 05:27:29 am
content: This is the third thread that Nhan95 has started on buying a multimeter. He/she doesn't seem to want to listen to advice and keeps starting new threads looking for a different answer.

author: Flump
author_rank: Frequent Contributor
timestamp: April 13, 2015, 07:21:40 am
content: Quote from: Lightages on April 13, 2015, 05:27:29 amYes it is but its the first thread specifically on weather True RMS is needed

author: Cherry
author_rank: Contributor
timestamp: April 20, 2015, 11:53:02 am
content: Maybe based on your economic status.

author: mswhin63
author_rank: Frequent Contributor
timestamp: April 20, 2015, 01:48:37 pm
content: Being a University student, I would suggest getting a true RMS meter. Also as a student getting the cheapest possible may well be a good idea as well.Malcolm
Is it necessary to use isolated power supply, isolated gate driver doubts - Page 1
Forum section: electronics / beginners

author: Benjam
author_rank: Regular Contributor
timestamp: May 07, 2022, 07:35:48 pm
content: I was looking at some motor driver related schematics and came across some doubts, mainly about phase current detection and feedback. There are several ways to detect, such as using an amplifier with an op-amp, or a special current detection chip, etc. But personally, I prefer to use a Sigma-Delta Modulator. such as the ADUM7704 (https://www.analog.com/en/products/adum7704.html), but I've read a lot of descriptions of the ADUM7704 and it seems to be more suitable for use in AC Motor field.If the target product is a DC servo driver with an input voltage range of 24V-60V, 60A continuous current and 80A peak current, does it make sense to use the ADUM7704? Why I say this is because some of the products I have seen using the ADUM7704 are almost always high voltage applications and the power stage is using isolated gate drivers.So for the 24V-60V input voltage range, do you need to use isolation? This is the first question.The second question is, if this voltage range (24V-60V, low voltage) driver, if isolation is not required, can we still continue to use ADUM7704? I mean, even if the gate driver is not isolated, can we still use the ADUM7704 to achieve the optimal result?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 08, 2022, 03:41:45 am
content: Hmm, S-D seems overkill just for a motor? But if you need to know, you need to know I guess.Hall effect would be the next best thing, typically with poor accuracy / high noise floor, but enough for plenty of control purposes.At lower voltages, translators like AD8210 are nice.Nothing wrong with using an isolated device at low barrier voltages, but for a...$12 part? YIKES!there are surely better solutions available...Tim

author: Benjam
author_rank: Regular Contributor
timestamp: May 08, 2022, 06:19:34 pm
content: Quote from: T3sl4co1l on May 08, 2022, 03:41:45 amThanks!