How To TEST OP AMPS Using A Multimeter vs Op-Amp Tester Project Single Dual

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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TEST METERS
ANENG AN8009 MULITIMETER
KAIWEETS HT118E MULTIMETER
VC480C+ MILLIOHM METER
MESR-100 ESR METER
XC6013L CAPACITOR METER

TM-902C TEMPERATURE METER
LCR-T4 COMPONENT ANALYZER
FNB58 USB ANALYZER
PCI POST ANALYZER
TL460S PLUS PCI_E ANALYZER
TOOLTOP ET120MC2 SCOPE
FNIRSI 1014D SCOPE
NPS3010W 30V 10A PSU
T12 STATION WITH M8 9501 HANDLE
M8 9501 HANDLE
YIHUA 982 Soldering Station C210/C245
FNIRSI HS-02 PORTABLE SOLDERING C210/C245
QUICK 861DW
PROS'KIT SS-331H

INFIRAY P2 PRO IR CAMERA + MACRO LENS
TOOLTOP ET13S THERMAL CAMERA METER
ET13S MACRO LENS
OPTICAL MICROSCOPE
TOMLOV TM4K AF FLEX
TL866 II+ PROGRAMMER
CH341 PROGRAMMER
NC-559-ASM FLUX

DESOLDER BRAID (I use size 8045)
HX-T100 SOLDER (0.6MM)
ESD-11 TWEEZERS

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Thank you
Richard

[UltraUltaderdritte]

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!

[darrenbird]

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

[RockyW]

Thanks for the handy Multimeter OPAMP test!! Very helpful, and easy!

[peterbrooks]

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

[Sloxx]

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.

[EJEuth]

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).

[Damaraja]

Very helpful. Thank you for providing such a hands on, no frills demo. 🤙

[orionRS]

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.

[TheEmbeddedHobbyist]

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.

[stevosteve]

This video was so much help to me. Brilliant.

[John_Smith__]

Another great video, simple and effective tester.

[johnallen]

Hi Richard, Firstly this video is enormously informative. I am taking my first steps into electronic repairs. I hope you notice and read my question. The BA4560 op amps, where did you order yours from ? I have found a few sources for them, but the codes on them seem slightly different. Some have an extra letter eg - BA4560N or whatever. What does this mean ? Will they do the job. I'm hoping to repair an old 12 input Studiomaster mixer with some faulty channels. Could fitting a chip with this slightly different code or another 'more modern equivalent' result in the repaired channels behaving/sounding different to the others ?
If they are cheap would it be prudent to just change out all of them ? ( plug in type )
If anyone else reading this could help, please do comment.

Regards, John Nottingham UK

[jesusgirarte-sandoval]

In what setting is the multimeter on to check op amps?

[joepiscapo]

The thing with ali express sometimes it's an imposter ic it seems. Hit and miss, or the number will arrive one letter different than advertised.

[dackelin]

Upps... burned. Super camera. (From Germany)

[xplorer]

is it possible to test simply the health of a dual op amp in circuit ? with a multimeter ? it's an SMD, and i don't have the means and tools to unsolder and resolder it.

[jasonsomerville]

Looks like an astable or monostable cct doesn't it, but with an op amp rather than 2 transistors?

[redbackmike]

Can you test LM741 using the reverse voltage multimeter method? Or is it just JFET input Opamps?

[fetaldreamcore]

Could you do a video showing how to test OTA ICs like a ca3080? Thx for all the great videos.

[whatwouldhappenif]

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?