How To TEST OP AMPS Using A Multimeter vs Op-Amp Tester Project Single Dual
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- เผยแพร่เมื่อ 13 ธ.ค. 2022
- LER #339 How To Test Op Amps using a Multimeter vs DIY op amp Tester Project for Single and Dual Operational Amplifier
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Thank you
Richard
Handy little tester. I will build one. I will give the diode junction test a try as well as I have a bunch of used op amps here. Maybe I will figure out some specific charateristics. Another great educational and entertaining video from you. Many thanks!
I just measured through my old/used op amp stock. Most op amp read like a diode junction at the inputs and outputs. I tested it for CA082, CA3130, CA3140, JRC2904, JRC3404, LF357, LF411, LM318, LM358, LT1354, NE532, NE5532, NE5534, TL061. The LT1001 reads a little high on the inputs with just below 1V. Some behave totally different.
The first group has a quite high reading at the output:
TL082/TL074: read around 1,3V at the output (TL08x needs also a long time to settle for a stable reading)
LM308: reads around 1,5V at the output
The secound group reads open at the inputs:
LM741/UA741/CA741/MC1741/MC1458 -> all 741er
LM301
This way I found a suspicious NE5534 which is likely bad. I have to further test it.
@@UltraUltaderdritte Thanks for the info *Pinned*
Thanks again mate! As I had all the parts, I made one along with your video, along with many, many pauses and rewinds! Cheers, Darren
Thanks for the handy Multimeter OPAMP test!! Very helpful, and easy!
I've built one of these opamp testers before and they are somewhat useful. The only thing I would change is to use a cheap ZIF socket instead of those standard IC sockets. It makes it much easier and faster to check opamps.
the new camera setup is nice
Thanks, Richard. A fun and useful project. I breadboarded it first then out of curiosity took out the two diodes on the single tester and it continued to work. Perhaps the diodes just cancel each other out. Regards, Peter
Very helpful. Thank you for providing such a hands on, no frills demo. 🤙
Another great video, simple and effective tester.
This video was so much help to me. Brilliant.
This circuit you rebuilt is simply a square wave oscillator using positive feedback to create hysteresis on the Vin+ input.
FEATURES:
That commercial tester is unique in a way: it “feels” the delay on the rise-time (or fall) of slower OpAmps (as LM358) usually employed as the base for faking faster ones as TL082/072: same pinout, but 20x faster than LM358. Detecting by Exclusive OR operation (description seen in your video) any delay from Input-Output, it confirms visually the delay and slower OpAmp. I believe it is an ingenious method to test slew rate and rise-time for large signals.
LIMITATIONS:
That circuit, however, does not test other features that are different for identification of wrong markings (LM358 x TL072), which may be important for user specific needs:
(1) common mode input voltage range: GND to Vcc-1.5 (LM) versus GND-1.5 to Vcc (TL; rare feature for a jelly bean OpAmp).
(2) crossover distortion (using sinusoidal/ triangular wave) - LM358 only.
(3) increased output impedance - TL0xx only.
SUPPLEMENTs:
(1) Possible way to investigate that Ex-OR circuit would be to increase switching frequency, so that rise-fall time correspond to a higher percentage of the duty cycle. This will make the “Red LED” more visible.
(2) Another possibility is to use Freq: 1KHz~5KHz and hear thru a small headphone speaker the Red LED output (AC buffered by a BJT).
Which just goes to prove that nothing will test every parameter of a component, but the tools are still useful in as much if they identify the chip as bad, it is definitely bad, if they identify it is OK it probably maybe is.
shhht... these things are not simple....
Great video dicky, also the new webcam is awesome, keep up the great work mate 🤙🏼🇦🇺
The diode drops seem are i expect the ESD protection, there is a chance that there is some also connected to the Vcc pin as well. Just measuring the diodes only shows that there is still a connection to the silicon inside, not that the chip will function as it should. this is the type of thing a flying finger PCB tester does, it can't test the components but it can check that pin is connected to the PCB track.
The tester is just making the opamp an astable oscillator. So a bit crude but it will need to have most functionality intact to flash the LED's so ok as a basic tester.
squeak !
I can confirm that 3:28 - 2nd method works also with shift register IC. And I always make a chart for that component, so for later comparison I dont need component, I just need that chart. Also never bother to measure IC while in circuits, surrounding components will mess up results. Remove it and test. Small DIY testers are OK if you work in lab everyday, but if you are working on field then you have to learn to use multimeter for a lot of different things and develop way of thinking. @Learn Electronics Repair, there is one more topic to cover (if you didnt already) some basic shift register chips.
I would agree about in circuit testing not always being conclusive, but I can't think of any configuration of connected components that would cause the op-amp to read open circuit (or high resistance) where it should read a diode junction - as happened in this case. I'm also very suspicious of the low reading on pin 1 (output from op-amp A) as that also read open once i removed the chip from the board - I will investigate what causes the low reading on the PCB
Could you do a video showing how to test OTA ICs like a ca3080? Thx for all the great videos.
Nice !....cheers.
Thank you
Upps... burned. Super camera. (From Germany)
Nice tester. Would your Huntron Tracker Octopus PCB Tester that you showed in one of your other videos be a better way of testing the op-amp in circuit?
Yes quite possibly - I'll play around with that when I get chance
Can you test LM741 using the reverse voltage multimeter method? Or is it just JFET input Opamps?
Looks like an astable or monostable cct doesn't it, but with an op amp rather than 2 transistors?
New cameras great
In what setting is the multimeter on to check op amps?
I would to ask how Diode mode works? does the multimeter inject 3 dc volt across the I.C. terminals and the multimeter reads the voltage drop between the two pins ?
Basically yes - sometimes more that 3V, near to 4V. The meter acts as a low power constant current source, so you read the voltage dropped across the device under test. It works in a similar way to my $1 short finder but with less current.
th-cam.com/video/0eixDdCpiO4/w-d-xo.html
Hi Rich , another great project.
How about building a usb port tester for voltage and data indication
Useful testing laptop with black screen
They cost 50 euros so very expensive for a simple circuit..one for the future??
I have a commercial one coming to review - after that we could look at building a home made one 😉
Can i apply this circuit on 4558 ic
So I'm wondering about that burned area on the PCB.
You said that you aren't going to "fix" that area and just jump over it, which makes sense.
But what I'm wondering, even though not fixing that area, are you going to use, perhaps, a Dremel type tool to grind out all the burned carbon so as to avoid carbon shorting?
Some of the burned areas that I've fixed were so deep that cleaning them out with the Dremel, literally left a hole right through the PCB. LOL But that was fine as long as the carbon was all gone.
I'm just wondering your method.
I like that little scope too.
I'm contemplating getting a portable scope, but as can be appreciated, they lower-priced ones all come from China and as is the case, reviews of most of them reveal that the claims of their specs and quality are very over rated.
Personally, since I no longer do repairs, other than my own, I can't justify spending hundreds of dollars on a good quality one.
But there is one I'm looking at that seems not too bad at all. The only problem, is that there are some very bad clones of it out there. I only buy from Amazon and some of the Amazon sellers won't answer a simple question, which of course, raises suspicion about their honesty and what the product really is. oh well.
Adrians digital basement has been covering some cheep portable scopes. Might give you some ideas.
I got this one, zeeweii dso1511g , find it on youtube Adrians digital basement. Its good enough for 65 euros.
This cheap 110MHz handheld scope worked very well for the €70 price tag , check out my review, I use the scope in some common real life repair scenarios and it did the job every time.
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LM358 on left looks counterfeit.
Too long. That is why I put dislike. 10 or maximum 15 minutes should be standard.