piclist 1998\10\29\005137a >
Thread: Strobes
face BY : tjaart@spamwasp.co.za

Alan King wrote:

{Quote hidden}

I've used this with great success on electret mic's. You want
to have good gain, but no tuning. The non-inv input of a
TL074 was hooked to the tail end of an RC network with a
time constant of 2s. The inv input was hooked to the positive
side of the electret. It worked pretty well. If you divide the
non-inv input, you can get away with a single supply and LM324's.

If you want to get really fancy, you can use an intrumentation
op-amp setup with the two inputs taken from the positive and
negative sides of the mic. Use a series resistor between the
negative side of the mic, and ground.

If what I said didn't make sense, tell me, and i'll try again ;)

Friendly Regards

Tjaart van der Walt

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