Envelope followers for vocoder.

[Brian Coates]

I need to find a schematic for a cheapy envelope follower.  I found a 10
band graphic EQ yesterday for 5 bucks, and I want to use the stereo
channels separately for a vocoder.  I'll use the left channel filters for
the instrument input, and the right channel for the microphone input.  I
need to put VCA's on the outs of the left channel filters, which I have
schematics for several, but I need a simple follower for the outputs of the
right channel filters to drive the VCAs

This should only take a couple of afternoons, and I probably have all the
parts already.  So hopefully, I'll walk away from this with a $5 vocoder.
I also found a five band eq for $4 that I picked up.  I figure no, it won't
be easy to understand words, but nonetheless, make some interesting sounds.

Thanks for any help.

Brian

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