Question: simple schematic

[butt]

If anyone has a minute: thought I might start taking up a new hobby and am trying to figure out a simple example of a schematic of a circuit that when turned on would output the current frequency (note) being played until the switch goes off.  So say you were playing a low e, or an e chord or whatnot and you throw on the switch the output would be the "e" and you could start throwing a guitar around like nutz and all you would hear is that same note until the switch goes off, thanks.

[aron]

If you wanted it to be the same note of your guitar, what you are talking about is a sampler.

Some of the samplers have a freeze feature that would do what you want, but this would not be a DIY solution.

[Paul Perry (Frostwave)]

A 'note holder' is a suprisingly difficult thig to do. Firs, forget chords (because, yu will need one oscilator per note!). And, even given only one note, it isn't that easy to lock an oscillator to it. But, given a phase lock loop, and given that you got it locked, then you could look at the voltage on the oscillator part & hold that constant.
Which is a problem itself, you will have droop over time, unless you have an analog to digital converter & a few bits of memory, and a D to A bac again (the 'infinite sample & hold').
So yeah, I thin DSP is all..

[Doug B.]

Check out how Boss did it with their Super Distortion Feedbacker DF2 (schematic link at the top of this page):

 http://www-public.rz.uni-duesseldorf.de/~pelz/schematics/schematics.html

Looks like a pretty involved circuit though, even without that damned electronic switching.

- Doug B.