REAL Bit Crushing - digital fuzz revisited

[Taylor]

I've built a couple of analog sample rate reducers, and I like them a lot, but I'd like to have a real bit crusher, using a-d-a conversion. I found this schem:

http://experimentalistsanonymous.com/diy/Schematics/Fuzz%20and%20Fuzzy%20Noisemakers/Digital%20fuzz.bmp

but the only person around here who's built it seems to never have gotten it to work. I think it's probably pretty simple to make this happen with just an ADC chip and a DAC, but I'm unsure about the specifics.

Any thoughts?

[brett]

Hi
the firsty thing that I noticed was that the opamp is running off 5V.
Only a low voltage opamp such as the LM358 will work at that voltage.
A better input system might be a JFET buffer/amp (e.g. Rd = 10k, Rs = 2.4k).  This would typically lift a 0.2 V p-p guitar signal to at least 0.5 V p-p, which is about right for the ADC.
cheers