Solved Build a function generator by using my PC sound card

March 8, 2017 at 01:38:47
Specs: Windows 7
Hi everybody,

I am trying to build a high power/current function generator. And I’m using a program called TTG as a function generator using my PC sound card, then I am trying to amplify the signal.

I am using an LM324N, I was successful to amplify the voltage from ~0.01V (my sound card output) to about 1.1VAC (testing sine wave for now), however when I measure short circuit current of the output it’s a mere 40ma.

Am i doing something wrong here?
Or do op-amps really give little current? And how should I go about amplifying the signal enough so it can drive... let's say a little ac motor.

FYI,here’s some details of LM324N:

Thanks in advance!

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March 8, 2017 at 10:12:06
✔ Best Answer
Did you read specs? It specifies the max output current is 40mA per channel.
If you need a higher power output you will need to design another circuit with higher current rated transistors and feed the output of your op-amp into that.

message edited by THX 1138

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