Simple circuit using audio to light LED - Page 2 — Parallax Forums

Simple circuit using audio to light LED

Ravenkallen · 2010-09-10 11:34:31

Hey guys. Sorry i am posting this in the Prop forum, but i seem to get the best answers here....I had a audio out cord on my laptop hooked up to a multimeter. Even at the highest volume level it only outputs about 0.20 volts. This is not even enough to turn on a average transistor. So how does somebody boost the voltage of…

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Phil Pilgrim (PhiPi) Posts: 23,514

2010-09-16 17:21 edited 2010-09-16 17:21

RadioShack carries the LM339.

-Phil

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