Lm324 tester

421

04:35:04

I recently bought a 20 pack of lm324s (quad op amp ic), and wanted to test them so I know they work before I put them in my projects. So I decided to build this circuit which test each one, then by probing the final out put, I know if they are all working. Each one has a gain of 2, and the square wave is generated by a 555 timer in a stable mode in my case (represented by the square wave generator in the circuit, but a function generator using any signal can be used), in my test circuit I used the voltage divider to step the the square wave to a smaller one that outputs voltages lower than the 555 can operate at to be amplified by the op amps, not to exceed the power supply voltage and cause clipping. 

published 6 years ago

cristchanto08gmailcom

6 years ago

👍

BillyT

6 years ago

Fair enough.

hurz

6 years ago

To your last sentence, lm324 is not a rail2rail it can not go upto supply voltage anyway. This is just a note.

justinmh

6 years ago

@hurz, that’s correct, I guess the better way of saying that is I stepped the square wave voltage down, and kept the gain low so I wouldn’t max out right away, hit the highest voltage out of the op amp, and not be able to see if they are all working.

gasboss775

6 years ago

You could have used one of the opamps to generate the squarewave avoiding the need for an external source. Google "relaxation oscillator"

justinmh

6 years ago

@gasboss, true, but that’s more components to plug into one op amp, then I’d still have to to a voltage divider to get the stepped down square wave... so more wiring and things to move around and make sure aren’t touching when I just want to test each one really quick. Plus using a 555 timer for a square wave generator isn’t too hard.

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