[sdiy] discrete/no-OTA VCO

[Ray Wilson]

Here is a simple transistorless oscillator (that's just an LED driver 
transistor general purp NPN).
http://www.musicfromouterspace.com/analogsynth/NewAugustRampLFO.html

----- Original Message ----- 
From: "DAF" <foda01 at epix.net>
To: "sdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, December 28, 2008 2:51 PM
Subject: [sdiy] discrete/no-OTA VCO


> Hello - can someone point me to a circuit for a  voltage-controlled lfo 
> that uses discrete or other easy to source parts.  I have used an 
> OTA-based design in the past, but I want to design around more generic 
> parts.  I seem to remember a vco that used a discrete JFET?  I don't neet 
> expo response or temp compensation.  I am looking for about a 2 to 10 Hz 
> response range.  I don't want to use any specialty chips or OTA's, just 
> discrete transistors and op-amps.   Any help greatly appreciated.
>
> thanks,
> Dave
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