Newsgroups: sci.electronics.design
Subject: Re: Beat trigger with electret microphone
References: <[email protected]>
Pasi Arffman  writes:

> I'm looking for a way to clock logic with the beat of the music. 
> This circuit would be working battery-operated, in rooms with sound
> pressures of
> 80-90 dB max, and using a normal electret microphone capsule. The gain
> should
> be controlled with an AGC.
> Any ideas would be appreciated!

Take a look at http://members.home.net/dmfraser/audio_tr.html

It is the best audio beat trigger circuit I have tested.
It will performs better than the beat sync circuits in
commercial disco light controllers I have tested.
I will recommend to take a look at the circuit.

For microphone you will just have to put the microphone
and microphone preamplifier in front of the circuit.
I have used this approach few times and it worked very well.

-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web pages at http://www.hut.fi/Misc/Electronics/