[sdiy] simple envelopefollower

[Synth-DIY]

Hi guys!
I'm looking for a simple envelopefollower circuit to be used together with the
Waspfilter. I hope to use Jurgens H's waspfilter schematic with this which means
that filterboard will have a 5V supply already.

Is there any simple but good guitarpedal circuit I should  study perhaps? 
Or maybe the Korg MS envelopefollower can be adapted to a 5v supply?

regards Per Mattsson