Performer's Audio

[Mark Amundson]

Henri Kovalainen wrote:
> On Thu, 12 Feb 1998, Mark Amundson wrote:
> > Some thoughts:
> > 1. Use the Analog Devices SSM2120 dual log detector/VCA chip for the
> > brains.

>  Oh goody. I haven't really examined the chip, but can't this be used to
>  create all kinds of tricks (maybe the same device could also work as a
>  compressor etc?).

The Analog Devices app note on the web (www.analog.com) for the SSM2120,
shows several possible applications for compressors, expanders,
limiters, AGC, and gates. The chip is about $7.00 a copy at Newark
Electronics but you get two channels of everything. Rane has a Mojo
compressor (www.rane.com) that uses the chip and you cane download the
pdf schematic file.

I have worked with this chip a bit this week on a bio-medical
application. The 22 pin package is odd but the part is resistant to my
mis-wires and torturing. The app note is a must read if you plan on
deviating from the available schematics. Access to 1% metal film
resistors and non-polarized electrolytics for the audio path is
recommended.

Mark Amundson,