[sdiy] audio to CV

[John L Marshall]

Sample and Hold
Comparitor
Quantizer
Envelope Follower

Multiple Bandpass Filters followed by above.

Do you want to hack? Older radios are easier to hack.

AM broadcast radios have an AGC (automatic gain control) circuit, a CV
feedback to IF and RF stages.
FM broadcast radios (not synthesized) have an AFC (automatic frequency
control) circuit, a CV feedback to the hetrodyne oscillator.
Many FM broadcast stations have subcarriers that transmit interesting
signals. Seiko pager watches used FM subcarrier for paging.

Shortwave or Longwave, could be a book of ideas.
Facsimile
FSK weather maps
Whistlers
Spherics
Dawn Chorus
Lightning
Continuous Wave
Television
Cellular (except USA)
ULF navy
Pirate
Clandestine
Number stations
Amateur radio
Utility radio
Navigation beacons


----- Original Message -----
From: Derek Holzer <republikasleazka at hotmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, January 02, 2002 4:39 AM
Subject: [sdiy] audio to CV


> DIYers,
>
> perhaps this is a 'newbie' question...
>
> i'm working on a project to use audio sources derived from radio signals
as
> control voltage. (i.e. patch from radio receiver audio out to synth CV in)
> i've investigated a sample-hold module (thanks, rene schmitz!), which i am
> building right now. what other devices are good for this... a comparitor?
if
> i build a simple AC/DC diode recitifier, should i follow it with a
smoothing
> cap? other suggestions?
>
> thanks, and happy new year from Holland,
> derek
>
> ps: pic and sound from my SN76477-based 'nasty noise box' are up at:
> http://www.gracies.org/derek/diy/
> ******200% atari-noise!*********
>
> pps: i would give the URL for rene's sh module again, but the page (+ the
> whole site) is down. wie gehts, rene?
>
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