hybridfree/eevblog-posts huggingface dataset:
Beginner measures capacitor with Fluke 17B - Page 1
Forum section: electronics / beginners

author: easilyconfused
author_rank: Regular Contributor
timestamp: August 13, 2010, 06:09:05 pm
content: Per instructions included with 17B Fluke: turned dial to capacitor check mode with red lead in capacitor check socket (V) and black lead in com socket. Display showing steady value of 0.47nF with no capacitor connected. Connected red lead to + leg of 47.0uF cap, black to - leg. Value displayed persists at 0.47nF. Shorted across legs to discharge any charge. Displayed value changes to 0L.uF. Maintained connections for more than 15 seconds per instructions. Display unchanged. Capacitor is known to be good as evidence by its ability to develop voltage on breadboard. Any explanations for meter results will be appreciated.

author: easilyconfused
author_rank: Regular Contributor
timestamp: August 13, 2010, 08:16:49 pm
content: I had never checked a cap before. After trying it, then posting my question, then Googling the process, it seems that checking caps with a mm is a joke. Best I can tell from Googling- you need an ESR. And they're pretty expensive. For the time being I'll assume that cap checking is beyond the scope of my beginner experiments. I'll replace the ones that are leaking goo or have some other obvious problem and assume that all others are working properly.PS: If what I have stated is true- cap testing as a mm feature should probably be given little value in reviews.

author: easilyconfused
author_rank: Regular Contributor
timestamp: August 13, 2010, 09:52:19 pm
content: I'm forever dreaming up contraptions that ultimately turn out to be useless. I was wondering if this might double as a pretty good cap checker and educational tool. All I know about capacitors I learned today so keep that in mind as you wonder what's going on in my head. It would be used in conjunction with a multimeter. When the start button is pushed it runs for five seconds then freezes the voltage reading. And, of course, I wouldn't have a clue how to build it.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 13, 2010, 10:03:59 pm
content: A good way to measure ESR is with a signal generator, oscilloscope, and a known (low value, less than 100 ohms) resistance.

author: saturation
author_rank: Super Contributor
timestamp: August 14, 2010, 03:19:22 pm
content: To measure capacitance directly, not its ESR you can:https://www.eevblog.com/forum/index.php?topic=909.msg11424#msg11424or with a good function generator via:https://www.eevblog.com/forum/index.php?topic=533.msg7756#msg7756

author: ModemHead
author_rank: Frequent Contributor
timestamp: August 15, 2010, 03:00:56 pm
content: Measuring a capacitor below 1 nF (0.001uF) with a multimeter is a challenge, but if your multimeter does not read somewhere around 47uF with a 47uF capacitor attached, the capacitance measuring function is definitely broken. A pair of very short test leads (~150mm or so) with alligator clips will yield best results.
Beginner needing help with receiver  - Page 1
Forum section: electronics / beginners

author: Bhutt
author_rank: Contributor
timestamp: April 19, 2020, 09:55:03 pm
content: Hi, my name is Bob and am very new to electronics as a hobby. My son and I have been collecting old shortwave receivers and bench equipment and it is time to start restoring them. I am hoping I am in the right place.Currently working on an ICOM IC-R71A thathas very low audio. Everything else seems fine at this point, an old Hammarlund will be next.Have checked the AF Gain control and it works from 0-15K. Have looked for cracked solder joints and have not seen any so far. I have followed the adjust procedure in the service manual, this has almost corrected the problem. However, part of this procedure I had to do by gestimate with sound from speaker and the crazy RF signal I was trying to peak on the oscilloscope. I was injecting a 100khz signal at 10mv from an old Pragmatic generator. I know its still not right but way better than it was.Needless to say, I now have an old LEADER AC Millivolt meter on its way and with the fantastic help from videos of EEVblog, W2AEW and others I hope to make a RF probe to go with it.Currently I need help with the RF section of the radio. As I received, someone had turned 3 of the IF transformers all the way in and left them that way. The wax markings on the sleeves of them show this tampering.These coils are not listedin the adjustment guide of the service manual so I am at a loss as to how to set them. There is also one IF on the main board that has been tampered in this way.I have searched endlessly for some guidance but have come up with nothing and am hoping someone here can lend a hand. Please see the two photos I have attached for the IF's in question which are L83, L84 and L85. L86 is part of the service manuals adjustment procedure.My son used it last night and reports it has better reception than the Kenwood R1000, another future restoreCheers,Bob
Beginner new to electronics learning  - Page 1
Forum section: electronics / beginners

author: langgin19
author_rank: Newbie
timestamp: December 14, 2015, 12:48:40 pm
content: Hi I was wondering all the good tools and equipment you guys could give me a list to buy so that I can learn more and fix circuit boards thank you in advance

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: December 14, 2015, 12:50:55 pm
content: https://www.eevblog.com/forum/beginners/electronics-primers-course-material-and-books/https://www.eevblog.com/forum/beginners/from-no-parts-to-decent-stockpile-best-approach/

author: Shock
author_rank: Super Contributor
timestamp: December 14, 2015, 08:27:16 pm
content: I recommend this book as it's only $6 used and covers a lot of ground.http://www.amazon.com/Electronic-Troubleshooting-Student-Text-Olesky/dp/0026763907/Read and ensure you fully understand, Chapter 3 - Electrical Safetyhttp://www.allaboutcircuits.com/textbook/Avoid just buying gear without a purpose, focus on education and practical skills like soldering and desoldering on junk PCBs before spending money, once you have good electronics fundamentals you will know what you need. All these tools have been covered over and over on the forums so get reading.Basic:multimetersoldering ironsolder suckercurrent limiting power supplycapacitor (ESR) & transistor testerAdvanced:hot air gunoscilloscopefunction generatorSpecific Advanced:logic analyzerspectrum analyzerarbitrary waveform generatorOther useful:variacisolating transformerdifferential probes

author: langgin19
author_rank: Newbie
timestamp: December 15, 2015, 02:23:23 am
content: Ok thank you but how about brands

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: December 15, 2015, 02:41:30 am
content: Multimeters : brandshttps://www.eevblog.com/forum/testgear/multimeter-spreadsheet/There is already a huge amount of information to answer your question on the forum. If you are a beginner, you will have to learn a lot. You will have to read a lot.Start by using the search function on the forum.

author: Shock
author_rank: Super Contributor
timestamp: December 15, 2015, 02:49:12 am
content: Quote from: langgin19 on December 15, 2015, 02:23:23 amThat would be where I said this...Quote from: Shock on December 14, 2015, 08:27:16 pmIf you want specific help then you need to specify a budget for each item, helps if you also list what you have, how old you are etc to talyor specific advice.If you want to start off with a multimeter you can also in google search formultimeter eevblog. Keep in mind that you can easily drop thousands of dollars on electronics, so what is good/best is not always best for you.

author: Kappes Buur
author_rank: Regular Contributor
timestamp: December 15, 2015, 04:43:26 am
content: To learn about Electronics try this, it is free to download and usehttps://www.eevblog.com/forum/beginners/electronics-primers-course-material-and-books/msg595164/#msg595164
Beginner @ Norton's Theorem - Page 1
Forum section: electronics / beginners

author: tec5c
author_rank: Frequent Contributor
timestamp: April 29, 2012, 08:17:56 am
content: Hi all,I'm here again in regards to a question I have involving Norton's Theorem this time.I know some expressed their concerns about getting other people to "do" my homework last time. This was never the case, though as a precaution I have left out all of the values from the circuit below to avoid any turmoil. I am stumped and would just like some advice from those who are willing to help.The question asks to determine the Norton equivalent at AB, from the circuit above.With the notes I have, along with reading around online and through some textbooks, I haven't seen any examples where they're analyzing a circuit with the subjected terminals in the middle of the network. It's throwing me off a little..Can anyone confirm if I'm going about this the right or wrong way please?Firstly, convert the voltage sources to current sources which turns the circuit into 3 current sources and 3 resistors all in parallel.Then algebraically add the current sources, followed by adding all parallel resistors (once current sources become open circuit for analysis).Leaving a single current source with a single resistor in parallel.Any help is most appreciated.

author: IanB
author_rank: Super Contributor
timestamp: April 29, 2012, 08:25:01 am
content: Note that you can easily reflect R3 and V2 across to the left (or else shift the A/B terminals far across to the right). Then it won't look like the terminals are in the middle of the circuit anymore.I think your approach will work. Note that when you have three resistors in parallel you won't add them you will combine them (I assume you meant that).When I look at your diagram I see (V1 & R2) in parallel with (I1 & R1) in parallel with (R3 & V2). So just convert (V1 & R2) to the Norton equivalent, do the same with (R3 & V2), then combine the three Norton circuits as you suggested.
Beginner Oscilloscope Advice - Page 1
Forum section: electronics / beginners

author: aaronsnoswell
author_rank: Contributor
timestamp: August 03, 2013, 08:03:41 am
content: Hi all!Long time watcher of Dave's videos, first time posterAfter watching Dave's recent $50 Oscilloscope video I decided I'd have a look to see what I can find (I'm from QLD, Australia). Being a beginner though, I'm not sure if the scopes I've found are good or not (for the price they are at). I was hoping someone more seasoned could help me out.The scope in question is a Tektronix 430A Digitizing scope (400Mhz, 2 Channels). Working condition, and it looks like I might be able to get it for around $100 including shipping. To me, this looks like a great deal, but is there something I don't know about this scope?Thanks all

author: dfmischler
author_rank: Frequent Contributor
timestamp: August 03, 2013, 10:11:35 am
content: TheTektronix TDS430Adoes have a 400 MHz front end, but it only samples at 100 MSa/s. That means that your bandwidth for non-repetitive events won't be more than around 40 MHz (think 8 MHz square wave). Also, this scope is full of proprietary (perhaps unobtainable) and surface mount parts, and as far as I recall the publicly available service manual is only to the module level (no useful schematics). So make sure it really works before you fork over your cash for it. If you can live with those restrictions then for $100 it might be a great deal.

author: Odysseus
author_rank: Regular Contributor
timestamp: August 04, 2013, 05:04:14 am
content: I was lent that very same model scope this summer, and it may be the exact same one because I decided to give it back before I moved across the US; the thing is such a heavy beast.I'd say it's a very usable scope. The 400MHz bandwidth with equivalent time sampling can be useful sometimes, but I left it in real-time mode for most of my work. I will also say, that the interface is pretty sluggish and also slow to boot. Especially so if you're used to a plain old analog or a modern DSO. It's also kinda loud.My favorite features were the storage capability and being able to make measurements without having to manually count off graticule divisions. Of course, the same could be said of nearly any DSO.
Beginner Power supply options - Page 1
Forum section: electronics / beginners

author: dennisyuki
author_rank: Contributor
timestamp: October 11, 2013, 10:26:38 pm
content: What does everyone think of this Power supply for a beginner, ECI 20500B.http://www.ebay.com/itm/Energy-Concepts-ECI-20500B-Digital-Solid-State-Power-Supply-/190778165009?pt=LH_DefaultDomain_0&hash=item2c6b43c711I like the features of this unit. What are the pros and cons?Or is there another power supply that would be better for a beginner in that price range.

author: sync
author_rank: Frequent Contributor
timestamp: October 11, 2013, 10:47:53 pm
content: It has no case. Do you want to build one?

author: bhilly82
author_rank: Contributor
timestamp: October 12, 2013, 03:43:17 am
content: I have one of these and seems to do the low power stuff well, I am in more to building and working on High Power Audio Amplifiers so I have 100a power supply for what I do mostly. But when i am tinkering the linked power supply works great for me. I have had that one for awhile now and no problems with it yet. I would say its a good choice for a beginner and the weekend hobbiest to start out with.

author: dennisyuki
author_rank: Contributor
timestamp: October 12, 2013, 04:19:12 am
content: Not having a case is not a problem. I c a n build one. Actually I am probable more skilled at building a case than my skill with electronics.I am a hobbies so low amperage is where I am at now. I just want more consistency than a 9 volt battery.Thank for the input.

author: Shark Bate
author_rank: Newbie
timestamp: October 12, 2013, 05:44:54 am
content: Sure this looks good for a electronics hobbyist.

author: tony3d
author_rank: Frequent Contributor
timestamp: October 12, 2013, 05:55:25 am
content: This one is $69.00 new, and looks like a nice deal. I have the next one up from this, and I'm very happy with it so far. It's very accurate, and stable, and has performed perfectly. The people at SRA Solder have been great to work with, and they offer a 1 year warranty. Plus it's a four digit display, is very compact, and it is a linear power supply so it should produce very little noise. It is only single output though.http://sra-solder.com/product.php/7163/1/korad_kd3005d_dc_precision_variable_dc_power_supply

author: madshaman
author_rank: Frequent Contributor
timestamp: October 12, 2013, 06:09:41 am
content: I have a huge biased recommendation to purchase a triple output power supply or a precision power supply by "power designs", you should be able to nab a cheap one if patient.They are built like a tank and super reliable.
Beginner Project - Crossover network - Page 1
Forum section: electronics / beginners

author: jharig23
author_rank: Newbie
timestamp: October 07, 2013, 10:07:07 pm
content: Hi Everyone! This is my first post on the forums. I'm taking a linear electronics class on coursera.com, and I'm finding it very interesting, and not really as hard at I thought it would be.The first project I would like to make is a crossover network for a speaker. This seems like a great starting point, since as far as I can tell, all I need to do is to design a high, low, and bandpass filter. Would I be correct in thinking that the equiv. impedance of the total circuit (including speaker) should be 4 or 8 ohms?Also, I'm concerned about the component selection. There are so many different types of capacitors, and resistors. Electrolytic, thin film, etc. Also power rating. Then inductors - should I try to wrap my own? Maybe my first project should be to learn how to use my oscilloscope.Anyway, I'm very excited about the whole thing! Any help or advice you can give me would be very appreciated!Thank you!James

author: Zsola
author_rank: Newbie
timestamp: October 12, 2013, 10:00:42 am
content: Hello!The total impedance of the circuit should be the same of the output of the power amplifier. If it's not matched, the amplifier overheats (eg. the speaker have lower impedance) or distort. So it depends on what kind of amplifier you are using. Generally, an 8 Ohm speaker is safe on almost every amp, except headphone amps.For parts, you can use polyester or polypropylene unipolar capacitors, they can whitstand over 63V (or even 630V). Normally, your power amplifier works on lower voltage (use at least double voltage cap!). If you want precise crossover frequencies, you can wind your own inductors, but if you want a quick one, you can use some power inductors if you can get around some mH.You can see two nice calculators here:http://www.diyaudioandvideo.com/Calculator/XOver/http://www.diyaudioandvideo.com/Calculator/APCXOver/Maybe some audiophiles ("audiofools") can help too. I'm not that kind of nerd. Greetings!
Beginner Project Fun - Voltage divider + 3 separately switched LEDs and a buzzer - Page 1
Forum section: electronics / beginners

author: fedaalis84
author_rank: Contributor
timestamp: January 10, 2020, 06:50:46 pm
content: Just wanted to share some fun I had with this little project & my very first intentional circuit.My initial concept was to connect 3 LEDs (each @ 15mA and their corresponding voltages) to a button, and when each button is pressed, the corresponding LED would light up and make a noise on the buzzer/speaker.Step 1: Measure the voltage drop across each LED @ 15mA using a bench power supply.Red: 2.09VYellow: 2.14VGreen: 3.01VStep 2: Create a voltage divider, using my 5.07V phone charging pack as the power supply, to obtain the necessary voltage and current for each LED...This is what I came up with:I used a wacky combination of 100 ohm & 10 ohm resistors in and not in parallel to obtain similar resistance ratings between each node.This was a great success! And I got similar voltages & current to what I was expecting.Step 3: Build the circuit (No pic cause I tore it down before thinking to take one).FAIL!!!!!Problem? The buzzer has its own VERY HIGH (~5.2M) innate resistance... Completely slipped my mind to even think of that.Step 4: Completely re-evaluate the circuit.Ultimately I wound up with this:Which is basically the same circuit with NO voltage divider, and a 100ohm resistor in parallel prior to the buzzer.BINGO!!! Works & each LED is at least limited in voltage and current enough not to blow out (But dissimilar to my desired current):20mA on the green LED & 32mA on the yellow & red.Overall, fun project...Nobody I know personally would care - LOL. So figured I would share here... - I realized now that a 330 ohm resistor in parallel with the buzzer would provide a better current across the LEDs. Now I get ~10mA in the green LED circuit, and ~13mA in the red & yellow circuits.

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 10, 2020, 07:09:20 pm
content: Hey, that's great! When I started in electronics, there were no LEDs. I would do similar things with small incandescent bulbs, toggle switches, and mechanical buzzers. Keep it up!!

author: fedaalis84
author_rank: Contributor
timestamp: January 10, 2020, 07:14:10 pm
content: Too cool! Thanks Wimberleytech!I am addicted. I have gone nuts on tools that far exceed my capacity to use them yet. Lol.LEDs/Breadboards are NICE!!!Originally I got hooked on this trying to fix a broken stereo (which I utterly destroyed with my poor technique and a cheap soldering iron).But I think I have more fun learning about basic circuits and Ohm's law, and eventually want to start trying to get a handle on KVL & KCL.
Beginner Project Help - Page 1
Forum section: electronics / beginners

author: Unknown
author_rank: Unknown
timestamp: November 07, 2009, 04:05:58 am
content: Greetings,So can we post about a project we are thinking about making and get members' recommendations and comments here?Thanks

author: desolatordan
author_rank: Regular Contributor
timestamp: November 07, 2009, 04:14:17 am
content: I don't see any reason why not. Go ahead!

author: aidan2496
author_rank: Contributor
timestamp: April 16, 2015, 11:12:18 am
content: Go ahead!

author: Quark-elec
author_rank: Contributor
timestamp: April 16, 2015, 12:29:16 pm
content: come on, go ahead!

author: Cherry
author_rank: Contributor
timestamp: April 20, 2015, 11:50:41 am
content: Come on!Go go go!
Beginner project - Page 1
Forum section: electronics / beginners

author: Mandelbrot
author_rank: Regular Contributor
timestamp: May 30, 2013, 05:27:26 am
content: Hello,I just finished my second year in electrical and computer engineering in college and I've been watching the EEVblog for about a year. I've made small electronics projects before like an obstacle avoiding robot and other basic stuff. I am looking for a good project to do next over the summer. I thought about trying to do a simple variable power supply, but I got a bit overwhelmed by that.I thought of another idea to add remote control to my robot by putting my cell phone on it and using DTMF to control it with another phone. I learned a bit about filters from a circuits class, and I suspect that there is probably a DTMF decoder IC, but I'm still wondering whether this would be too difficult for a beginner like myself.Is this project something a beginner could handle, or should I try something else first.Thanks,Ryan

author: Paul Price
author_rank: Super Contributor
timestamp: May 30, 2013, 08:07:46 am
content: If you cannot understand the theory and operation of a power supply project you will have a great deal of trouble trouble-shooting a DTMF project. By any estimation of my own, if a power supply project overwhelms you, a DTMF robot project will demoralize you.Tell me I am wrong!Do anything you want to enjoy yourself in this new field of interest.It is always ok to start a few small fires in your workshop when just beginning to learn electronics.

author: Dave
author_rank: Super Contributor
timestamp: May 30, 2013, 09:30:42 am
content: I encourage you to take on overwhelming projects. I find that I learn the most, when I'm working on a project that overwhelms me. You find a problem, you research it, read interesting application notes, articles, you ask questions on forums, and learn more than you could ask for.A linear power supply is a great project for a beginner. It's a tool you are surely going to use in the future. There are plenty of threads on this here forum about different linear supplies, look them up. I would suggest you don't just copy the projects, but rather study them, figure out what makes them work, how negative feedback loops make sure the output is stable, and which things could be made better - to your own preference. Use that knowledge to design your very own power supply and make it. If something doesn't work as well as you would want it to, figure out what is wrong, redesign the circuit and try again. Repeat as many times as needed. Once you get everything right, I'm damn sure it will serve you well, and you will be proudly showing it off to your colleagues.But remember toalways be safe!Make sure you don't end your career early, because you somehow make acquaintances with mains voltage.
Beginner Question on Comparator.  - Page 1
Forum section: electronics / beginners

author: n0b
author_rank: Contributor
timestamp: November 10, 2015, 11:52:49 pm
content: I found an IC in a power supply, the Texas Instruments Lm393, which I read is called a low power dual voltage comparator. What does a low power dual voltage comparator do?http://www.st.com/web/catalog/sense_power/FM123/SC60/SS1089/LN1605/PF63723

author: Len
author_rank: Frequent Contributor
timestamp: November 11, 2015, 12:12:10 am
content: Quote from: n0b on November 10, 2015, 11:52:49 pmIt compares two voltages and tells you which is higher.https://en.wikipedia.org/wiki/Comparator"Dual" means there are two separate comparators in the one chip.
Beginner repairing an ultrasonic cleaner - Page 1
Forum section: electronics / beginners

author: Cactus
author_rank: Contributor
timestamp: December 15, 2018, 03:29:49 pm
content: Ok folks this is my first attempt at an electronics repair. It is a ultrasonic cleaner that i think has a power supply problem.The cleaner has a main power supply board that feeds four smaller boards that power two transducers each. the mainboard also feeds the heating element for the tank.the cleaner is controlled by a control panel also fed off the main board that allows the user to vary the temperature and the time that the cleaner operates for. temperature and time functions are set with up and down buttons and switched off and on by an on/off button.. So we have 3 buttons each for temp and time.When the machine is switched on at the wall it powers up and temperature and time is displayed on the 2 LED displays. the functions can be set with the up and down buttons and the heating element can be switched on. However when you attempt to switch on the transducers the fuse blows on the main board.Disconnecting the heating element and transducers from the board makes no difference. The fuse still blows, so I am now focusing my efforts on the main power supply board.My question is how should I approach this repair? Should I simply begin testing components one by one or are there likely candidates for failure I should focus on first?I have pics of the board if they are required. Any guidance is appreciated.

author: SeanB
author_rank: Super Contributor
timestamp: December 15, 2018, 06:49:06 pm
content: Pictures will help, but I would suspect the 4 1N4004 diodes in the ultrasonic power supply side have gone short circuit.

author: Cactus
author_rank: Contributor
timestamp: January 04, 2019, 07:03:53 pm
content: Quote from: SeanB on December 15, 2018, 06:49:06 pmWell I got some time over Xmas to have a look at this power supply and I checked every component off the board. I appreciate I probably didn't need to do that but I looked at the exercise as a learning and practice opportunity, and I'm glad i did it.Unfortunately due to my limited skills I managed to break a trace on the board so had that problem to overcome too. I'm pleased to report that ultrasonic power has been restored by the replacement of two diodes.A sincere thank you for your help SeanB it is appreciated.
Beginner repairing modern TVs - Page 1
Forum section: electronics / beginners

author: rthorntn
author_rank: Frequent Contributor
timestamp: May 09, 2022, 12:08:52 am
content: Hi,I have an 8yo LG 55EA9800 55" OLED, purchased at launch RRP, so I spent a small fortune on it, the picture was still great, but the display went black at the weekend, its turning "on" (I can hear the "click") but I can't see or hear anything so I guess a board is dead, can anyone point a beginner in the right direction?Has anyone repaired here repaired a modern set like this, from googling around I can see that there is a "T-Con" board as well as a Main B/D, the service manual (for a blank screen with no sound) says "Check various voltages of Power Board (3.5V, 12V, 20V & 24V)" and if its not the PSU then replace the Main B/D. Update: I took the back off the TV and measured 3.5V, 12V & 24V OK.I mean I would easily pay up to $500 to get it working again, it was a great TV, its quite a delicate thing though and a bit daunting to have to move it around alone, I have a DMM, I guess I can get into the back of it to check them voltages.Thanks.Richard

author: strawberry
author_rank: Super Contributor
timestamp: May 09, 2022, 11:24:02 am
content: worn, 8Y is much, processors run at max temperature they can handleIf it runs in protect mode, in diode mode test supply rails for shorts, Tcon, CPU...abnormally hot chip may lead to right direction

author: Terry Bites
author_rank: Super Contributor
timestamp: May 09, 2022, 11:48:33 am
content: Here's the service manual- check all your rails.https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiHmenDq9L3AhUGacAKHR_WCcIQFnoECAQQAQ&url=http%3A%2F%2Fwww.lcd-television-repair.com%2Fnewsletter%2F3-11-2015%2FLG-55EA9800.pdf&usg=AOvVaw2j8xfWO4RwQnf_9yBixXB8
Beginner scope usage- probing differential and common mode voltage - Page 1
Forum section: electronics / beginners

author: Buildingthings
author_rank: Contributor
timestamp: November 24, 2022, 04:03:54 am
content: I am using my new Siglent 1104x to troubleshoot CANbus signals. I have watched the video on how to not blow up your oscilloscope, and I think that I am safe.I would like to probe the differential voltage of a CANbus signal pair, and measure the common voltage offset. Abnormalities can help identify faulty devices or faulty connections to the network.I am planning:channel one to High signal, channel two to Low signal, (no ground) to measure differential voltage.Next the common voltage- do I want to connect the probe grounds to the network ground? Both probes?*I am powering the network and devices through an isolated ground power supply, so no mains ground reference.Thanks for any help- newbie here.

author: bdunham7
author_rank: Super Contributor
timestamp: November 24, 2022, 04:18:39 am
content: What point do you want to measure the common mode voltage from? Whatever that point is, put both your ground clips at that point together (for best signal) or just use one ground clip (for maximum protection against errors). Then you can use the math function--common mode is (CH1 + CH2)/2 and differential mode is CH2-CH1.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: November 24, 2022, 04:03:23 pm
content: In situations like this I use my scope mostly for verifying signal integrity, and thus probe the individual wires (referenced by ground). I don't look at the data at all, but just signal levels, ringing, abnormal levels which indicate faults.When you want to look at the data itself, it's usually better to measure on the "other side" of your transceiver IC.

author: David Hess
author_rank: Super Contributor
timestamp: November 24, 2022, 10:25:30 pm
content: If the oscilloscope and device under test share earth ground, then the probe grounds should only be tied together. If the oscilloscope and device under test do not share earth ground, then the probe grounds should be tied together and to the single point ground on the device under test, although this may not be necessary.

author: Buildingthings
author_rank: Contributor
timestamp: November 26, 2022, 06:58:34 am
content: Quote from: Doctorandus_P on November 24, 2022, 04:03:23 pmYes I wish to do the same. I will research the ringing further, have never looked at that before.For reading the CANbus data I have a gateway that connect bus to USB then an app that reads packets. I save that file as text, load to excell and search for specific PGNs of concern. I am working on an Excell script to calculate CANbus loading (packets sent per minute) and then to chart it.

author: Buildingthings
author_rank: Contributor
timestamp: November 26, 2022, 07:02:10 am
content: Thanks for the replies. I used an isolated ground power supply for the device powering the CANbus. I connected one probe ground to the device ground and measured common mode voltage, then both probe grounds to the same device ground. Same reading, so I suppose it does not matter.
Beginner - tool recs - Page 1
Forum section: electronics / beginners

author: ZeroHertz
author_rank: Newbie
timestamp: June 16, 2020, 09:11:33 pm
content: Hi all, new here on the forums. Not so new at having an electronic technician diploma, but personal lab experience is at 0%. So I wanna build a small starters home lab, I wanna git gud at electronics.Topics id be interested are audio and video circuit design, wireless transmission, synths, and some industrial process electronics too, with motors and stuff. All of this will come to realization later, I have quite a way in front of me to sharpen my skills, but those are the approximate goals. Maybe some will shape out to be in more favor than the other, but that's all later for me to discover.What I need is Multimeter (pair?) and Oscilloscope recommendations now (and maybe some additional testers I might need too), for those applications, so that maybe I don't buy twice down the road. Other basic tools are covered and PSU's will be as projects. Thanks yall guys, cheers!
Beginner trying to program eeprom. Help please.  - Page 1
Forum section: electronics / beginners

author: BruceSans
author_rank: Newbie
timestamp: January 02, 2024, 07:30:22 pm
content: A few days ago I requested assistance identifying an eeprom so I can clone it. The chip was a microchip 9365217. The feedback I received suggested it was a 95040 or 25040 or 25lc040 or 25lc040a. Using my t48 I am able to read using all the suggestions in circuit. For my donor chip I removed from circuit and tried to program for each of the chips. I receive the same error no matter which one I select. Below is the error I receive. Can anyone tell me what I am doing wrong?ERROR! FLASH Address:0x000000. Buf_Val:0x4c. IC_:0x79The full message is in pic attached. I should also mention that the donor chip is same 9365217 number.

author: madires
author_rank: Super Contributor
timestamp: January 02, 2024, 08:15:41 pm
content: Have you erased the chip before programming? Or does the software perform the erasing automatically?

author: BruceSans
author_rank: Newbie
timestamp: January 02, 2024, 08:27:33 pm
content: The software was an option to erase in the drop down menu along the top but the erase option is grayed out so I am unable to select it. I am using xgpro v12.63I was thinking I needed to erase donor chip but haven’t figured out how since option is grayed out. I also noted the error values are what’s in the first block for the original and donor chip flash

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 02, 2024, 08:41:19 pm
content: Apparently it tries to write 0x4C over 0x79. As it is an eeprom it should erase automatically, but there are write protect options. Maybe the hardware write protect is not high, or the internal write protects are engaged.Edit: There is a problem with your attached image though. The thumbnail shows what is intended, but when clicked on it, it shows some other image. This is due to a known problem of the forum attachment system. Instead of using the drag and drop option or the first select line, always choose the second "more attachments" option to select your files.

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 02, 2024, 08:48:41 pm
content: Quote from: BruceSans on January 02, 2024, 08:27:33 pmThe datasheets of both ST95040 and Atmel 25040 show the available commands. There is no erase command. That is more of a FLASH memory thing. See page 8 of theAtmel datasheet.

author: BruceSans
author_rank: Newbie
timestamp: January 02, 2024, 08:59:26 pm
content: I appreciate the document and read over it but it is above my head. Using a t48 can I erase the chip or unprotected it so that I can program the chip with the flash from the original?

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 02, 2024, 09:16:14 pm
content: Sorry, I'm not familiar with the t48 and the software you use with it.Make sure that pin 3 is at vcc (high). This is the external write protect.Try scanning the menu options to see if there is a read of the status register. If so look at the bits 1, 2 and 3. Bit 1 should be 1 to allow writing. Bits 2 and 3 should be 0.
Beginner working with surface mount passives. - Page 1
Forum section: electronics / beginners

author: Meaker
author_rank: Newbie
timestamp: July 18, 2013, 12:00:13 pm
content: I want to change the value of a built in resistor network as shown here:http://i4.photobucket.com/albums/y143/Meaks/Resistor_zps7b90fafa.jpgThis sets the output voltage and the spec sheet shows that a reduction in the resistor to ground raises the voltage.To test I have used a pencil to draw over the resistor and lower the value (multi meter to test the new value) and it works as expected. This is not however ideal as a permanent solution.What tools and technique would I be best off getting to do a low volume of these or is it just not practical due to the size and density of the components?

author: KJDS
author_rank: Super Contributor
timestamp: July 18, 2013, 12:11:02 pm
content: You need a decent soldering iron, flux, solder, tweezers and probably a magnifier.I think it's an 0402 size which isn't too bad to do. I'd recommend a soldering iron from JBC, Metcal or Pace. You'll struggle with almost any other. Depending on your eyesight, either a magnifying lens or a microscope so you can see that you have a good joint.

author: NickAmes
author_rank: Contributor
timestamp: July 19, 2013, 04:41:21 am
content: You can lower the resistance by tacking on another resistor in parallel to the first (essentially the same thing you did with the pencil lead). Use the formula for resistors in parallel (https://en.wikipedia.org/wiki/Resistor#Series_and_parallel_resistors) to calculate the value you need.Quote from: KJDS on July 18, 2013, 12:11:02 pmSecond the recommendation for flux and a good set of tweezers. Flux is the essential ingredient in getting a good joint, and high quality tweezers will save you frustration. However, you don't need a fancy soldering iron to do this kind of operation. A Hakko FX-888 should be fine. I've done similar work with an even lower quality iron.
beginner  - Page 1
Forum section: electronics / beginners

author: boot
author_rank: Newbie
timestamp: March 19, 2016, 01:10:34 pm
content: hello this is my first time here my name is mohamed and u can call me ' boot' anyway i'm still beginner in elctronicsso what is the recomeded tools in elctronicsand the advanced

author: Shadetreeprops
author_rank: Regular Contributor
timestamp: March 19, 2016, 01:23:12 pm
content: a basic starter set up.Soldering iron or station just opt for the station as it will come in handy as you advancesolder sucker, very useful tool for taking solder off things when removing parts from boards. fairly cheap tooa basic Power supply unit can get a basic basic one for about 30 dollars, or just build one as your first project.a multimeter is a must, and do not skimp on getting a good one, it will last ages.if you are wanting to program ICs then get a arduino (someone else help here) as my knowlege of this is limited to less than basiclater on get scope for more advance work...multi channel power supply later on for advanced worka solder station is good for advanced or beginnera desoldering station for making quick work of part removal - but ur basic solder sucker will be your best friend cheap and easy to replace should it wear out.but i am sure there is alot more. that others can fill in. i am just a basics beginner myself.

author: boot
author_rank: Newbie
timestamp: March 19, 2016, 04:18:20 pm
content: Thx for help are u have a facebook account if u have kindly send it to me

author: xoom
author_rank: Regular Contributor
timestamp: March 19, 2016, 04:34:38 pm
content: Breadboard is also good thing to have

author: 3db
author_rank: Frequent Contributor
timestamp: March 19, 2016, 04:43:19 pm
content: I agree with Shadetreeprops and Xoom.I also think that Arduino is the easiest route to using microcontrollers.A few components (new or salvaged) come in handy too.

author: Gyro
author_rank: Super Contributor
timestamp: March 19, 2016, 05:56:32 pm
content: Hello Mohamed,Just a small hint... It is a good idea to make your Subject line a bit more descriptive. You're posting in the Beginners section so a single word subject of "beginner" doesn't really attract people to read it. If you make it a bit more descriptive eg. 'Recommended tools?' you might get more responses.

author: boot
author_rank: Newbie
timestamp: March 19, 2016, 06:41:41 pm
content: thanx all for ur suggestion

author: Hydrawerk
author_rank: Super Contributor
timestamp: March 19, 2016, 08:18:51 pm
content: QuoteYes, if it has a decent input protection. Although I do not have this one, I recommend a multimeter made by Brymen, Taiwan.http://www.tme.eu/gb/katalog/?idp=1&search=brymen&cleanParameters=1#id_category=112607&search=brymen&s_field=accuracy&s_order=DESC&visible_params=2%2C1785%2C1314%2C1796%2C1790%2C1787%2C1784%2C1799%2C55%2C1801&used_params=1785%3A11966%3Bhttp://www.brymen.com/product-html/index.html#Digital-Multimeter

author: Jbliss
author_rank: Regular Contributor
timestamp: March 20, 2016, 12:52:37 pm
content: pick up some generic parts like555 timersome voltage regulators 78057000 series logic4000 series logiclm741 Opamps
Beginner's Giveaway - An Upcoming Event Notice - Page 1
Forum section: electronics / beginners

author: xrunner
author_rank: Super Contributor
timestamp: March 19, 2015, 09:30:11 pm
content: Heads up beginners!There will soon be a thread posted on this Beginner's board which will detail the FREE giveaway (including shipping) of a benchtop DMM and, rumor has it, two other FREE handheld DMMs, all of reputable manufacturers. Meaning, the winner will get the benchtop DMM and two others will receive the other DMMs. Sorry, but the contestants must reside in the United States due to shipping costs.The details of the "contest" are still being formulated - but it's all for beginners who NEED these items to help get started. This has been OK'ed by the proprietor of this esteemed establishment.Keep your eyes open in the next 24 hours ...Admin(s) or Global: Please sticky the actual contest thread when it appears. Thank you.
Beginner's Guide to Hacking - Page 1
Forum section: electronics / beginners

author: T3sl4co1l
author_rank: Super Contributor
timestamp: April 07, 2018, 02:34:32 pm
content: It may be specific to "hacking", but it generalizes well. For any in-depth field, the exact same advice applies.Also, good programming videos from LiveOverflow if you're interested.Tim
beginner's hot air rework station - Page 1
Forum section: electronics / beginners

author: apple32
author_rank: Newbie
timestamp: December 06, 2014, 11:03:57 am
content: hello,I own an antex s25 soldering iron and a solder pump and for years I have been successful in desoldering non-smd chips.But now,I have to desolder and smd chips and especially those who have some of their pins under them(so solutions like chipquik won't do much).I have seen this videowhere Dave uses the atten 858d and I liked it very much.What station would you think that would be a good idea to buy?Please note that I can buy only from the european union or china (not usa) because I won't have to pay import fees and taxes when buying from them.Thanks!

author: poot36
author_rank: Frequent Contributor
timestamp: December 07, 2014, 07:05:26 am
content: That model you mentioned or a similar rebranded model for around $100 or so would be a good starting point. Just make sure that it comes with different size nozzles. I have used a similar model to remove 32 pin square chips before.
Beginner's question about basic amplifiers - Page 1
Forum section: electronics / beginners

author: John0922
author_rank: Contributor
timestamp: January 20, 2017, 07:15:59 pm
content: Hi- I'm learning about basic amplifier configurations, and I'm having trouble understanding the term "common" used in that context. Please see my attachment.For example, the common emitter configuration shows the output and what is presumably the output ground, but in the real circuit there's a power supply in between the emitter and the output ground, and that output ground is actually the positive terminal of the power supply.I always thought the term "common" meant a node with the same voltage potential, but that is not the case here. I'm trying to understand the bigger-picture context-- is the output ground somehow connected to ground in other parts of the circuit? If so, wouldn't that short out the power supply?Thanks in advance for your help. -John

author: Seekonk
author_rank: Super Contributor
timestamp: January 20, 2017, 07:31:09 pm
content: Just think of it as some point that doesn't change with the signal.

author: PA0PBZ
author_rank: Super Contributor
timestamp: January 20, 2017, 07:43:01 pm
content: "Common" is in relation to the signal input and output, look again at the drawings. Signal input and output are 2 connections, and for instance with common emitter both input and output use the emitter as one of the connections. So it is "common" for ac signals and it doesn't say a lot about the dc.(yes I know, this is simplified but I hope it helps to understand)

author: John0922
author_rank: Contributor
timestamp: January 20, 2017, 10:05:30 pm
content: Thanks for the replies. I think I get it.

author: Brumby
author_rank: Unknown
timestamp: January 21, 2017, 12:05:11 am
content: I like this explanation:Quote from: PA0PBZ on January 20, 2017, 07:43:01 pmI might also like to point out that this is talking about one element of a circuit topology - or "shape", if you will - and some fundamental characteristics. It's not a full circuit design. You mention "ground" and power supplies, but these are not important just yet.If you are thinking "common" means "ground", then you are getting confused with commonly observed usage where numerous components are connected to a single rail. This tutorial uses the term "common" in the context of a single transistor and the connections to its input and output.

author: John0922
author_rank: Contributor
timestamp: January 21, 2017, 12:39:43 am
content: There's some good clarification there, thanks Brumby.
beginners book bundle (13 days... to go) Arduino and Makers - Page 1
Forum section: electronics / beginners

author: kaz911
author_rank: Super Contributor
timestamp: December 03, 2015, 06:18:33 pm
content: Hi guys and girls?HumbleBundle is running a Make: book bundle " pay as you want " - I think lots of resources for beginners!https://www.humblebundle.com/getbooksQuote

author: AlxDroidDev
author_rank: Frequent Contributor
timestamp: December 03, 2015, 06:59:06 pm
content: I think it is still 13 DAYS to go.

author: kaz911
author_rank: Super Contributor
timestamp: December 03, 2015, 07:20:47 pm
content: Quote from: AlxDroidDev on December 03, 2015, 06:59:06 pmthanks for correcting me*G*