Wind-machine

[Tim Ressel]

Niklas,

Paia used to sell a wind machine kit. Anyone out there have a schematic, I
wonder? Anyway, As I recall (from 20 years ago...), it used a LM3900 to produce
4 sloq square waves, which were mixed to make a "random" CV. Then a transistor
noise source fed a bandpass filter using diodes and voltage variable impedance
devices. the CV from the 3900 fed the diodes. This scheme worked okay, and
should be do-able with discretes.

Hope this helpes.

Tim Ressel--Hardware DQ
Hewlett-Packard
Verifone Division
916-630-2541  
tim_r1 at verifone.com                     



-----Original Message-----
From: Niklas Rönnberg [mailto:nikro at itn.liu.se]
Sent: Monday, February 07, 2000 2:21 AM
To: Synth Diy
Subject: Wind-machine


Hello!
I would like to build a little and simple wind-machine. Yes, I know that
I could do that with almost any synth, but I want a stand-alone
wind-machine. 
Ok, I need one noise-generator, one LFO, one VCF, and a VCA. But I have
one more wish; I just want to use transistors! 
The LFO should do tri, and why not sinus. The VCF should be a Low Pass
filter. Both the VCF and the VCA can be controlled by the LFO, but the
VCA should have a pot where I can control the initial level.
Any comments? Any ideas?
Regards
/Niklas
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