Harry Bissell's envelope follower

[egasimus]

Now here's a circuit I'd very much like to try out. Here, I drew it up in Eagle, if anyone feels like experimenting with it.
http://www.4shared.com/file/NpBJAuK7/BISFOL.html

My most important question is this: could the performance improve if I applied my favourite technique of full-wave-rectifying the signal once or twice before feeding it into the circuit?

I've replaced the CMOS IC with half an opamp. The EDN article says:

To ensure that one of the detectors holds the highest peak value for the entire input period, the reset clock period is slightly longer than one-half the period of the lowest input frequency.

So for a minimum frequency of, say, 100Hz, do I tune the oscillator to 3*55Hz or 4*55Hz?

I'll also probably convert it to a single supply power rail when I get to building it - looks like an easy mod.

[Gurner]

Now here's a circuit I'd very much like to try out. Here, I drew it up in Eagle, if anyone feels like experimenting with it.
http://www.4shared.com/file/NpBJAuK7/BISFOL.html

My most important question is this: could the performance improve if I applied my favourite technique of full-wave-rectifying the signal once or twice before feeding it into the circuit?

I've replaced the CMOS IC with half an opamp. The EDN article says:

To ensure that one of the detectors holds the highest peak value for the entire input period, the reset clock period is slightly longer than one-half the period of the lowest input frequency.

So for a minimum frequency of 100Hz, I'd tune the oscillator to 55Hz or something?

I'll also probably convert it to a single supply power rail when I get to building it - looks like an easy mod.

You'll probably have more input if you just link to the pdf file...

http://www.edn.com/file/18042-122602di.pdf (second article in that pdf file)

Re your question, yes full wave rectification will have less ripple & therefore perform better  ....two lots of full wave rectification to me seems a tad excessive!

Re the frequency of the reset clock.....yes your calculations to me seem right.....but that's per 'peak detect' stream

[egasimus]

Thanks
My actual question about the frequency was more along the lines of whether I multiply the 55Hz by 3 or 4, given that the IC's 4th output is connected to the reset pin... My bad :/
And, double FW rectification might be overkill for a guitar, but it doesn't hurt - and a bass's low E was something like 38Hz, so it might help there.