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> I want to use my PC sound card to build a function generator
Barjugh
post Mar 16, 2017, 02:12 AM
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I am trying to build a high power/current function generator. And Iím using a program called TTG as a function generator with 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 itís 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.
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haohao
post Mar 16, 2017, 07:43 PM
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As to the issue, I just searched in the Internet and found that the op-amps (if referring to the operational amplifier) didn't necessarily give little current ouput. You might need to add a fluid parallel resistance and also a battery for energy storage. In additon, the LM324N you used was good but might not last long. Anyway, I'm not a fellow and it's just for references.

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Barjugh
post Mar 20, 2017, 06:06 PM
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QUOTE(haohao @ Mar 16, 2017, 07:43 PM) *

the LM324N you used was good but might not last long

As you said, could you recommend me some other components that can replace the LM324N? Thanks very much!
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Barjugh
post Mar 20, 2017, 06:09 PM
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If need, here's the datasheet of LM324N for your reference: http://www.kynix.com/uploadfiles/pdf2286/LM324N2fNOPB.pdf
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haohao
post Mar 20, 2017, 06:18 PM
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"You might need to add a fluid parallel resistance and also a battery for energy storage." If in need for more functions, a nano-chip is necessary. "Anyway, I'm not a fellow and it's just for references. "
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