[sdiy] Simple compressor, agc, ?

[Tim Parkhurst]

> -----Original Message-----
> From: Toby Paddock [mailto:tpaddock at seanet.com]
> Sent: Thursday, September 30, 2004 5:10 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Simple compressor, agc, ?
>  
> Howdy,
> I'd like to build a very simple AGC type thing
> for a "tuning display". Room mic (or whatever
> tuning standard) gets compressed like 100% and
> drives the horizontal of an o-scope. Whatever
> you're playing gets compressed some and drives
> the vertical. Then look for lissigu...
> lissajue... lissijou...   some of those patterns.
> 
> Need:
> Pretty high compression.
> Cheap and easy.
> A few volts output. Either +/- or 0-V.
> 
> Don't care too much about:
> Distortion, noise, speed, freq response.
> 
> Thanks,
> Toby Paddock
> 

I don't have any specific ideas, but this sounds like something that is just
begging to have some vactrols thrown at it. Might be just the gain control
element you need. Maybe they're too slow though. Also, wasn't JH working on
a compressor based on using an EL panel to rectify / smooth the control
signal? That looked to be relatively inexpensive from what I recall...


Tim (Lisa Joe Pattern, my cousin in Arkansas) Servo



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