[sdiy] noise gate?

[Colin Hinz]

On Tue, 6 Jul 2004, Roy J. Tellason wrote:

> Anybody got a schematic for a simple noise gate circuit?  I'd like something
> that would be adaptable to providing a logic output when a signa (say from a
> mic) exceeded a certain level...

EPFM.

Less terseness? Oh, sorry.

Craig Anderton's ELECTRONIC PROJECTS FOR MUSICIANS. The book is available
from PAiA (and elsewhere, I'm sure, as it's published by Amsco, which
should have good music-store distribution) and PAiA sells bare circuit
boards as well.

But be cautioned, Anderton's circuit uses the now-unobtanium RC4739
which has the unfortunate distinction of a pinout which is as
extinct as itself -- hassle-free substitution is not possible.
Fortunately, it's not too difficult to handwire a "ordinary"
op-amp IC in its place, but this does tilt the balance in favour
of using "Vectorboard" instead of buying the PCB.

The circuit also calls for a CLM-6000 opto-isolator, but if you only
need the "gate" signal, you won't need that chunk of (near)unobtanium.

Terseness? As if.

- Colin Hinz
  Toronto, Canada