[sdiy] National LM139 VCO

[James Patchell]

Yep...that one has been around a long time...the same oscillator is also in 
the LM324 Data sheet.  I used this oscillator in my first synth (circa 
1974).  It is a true VCO, in that the voltage really controls the frequency 
(rather than current).  Not a bad VCO....I had a lot of fun with it....not 
really too sure exactly how linear the response is, however, since back 
then, I had no way to measure it...but, I was able to make music with it.

At 04:55 PM 10/7/2004 -0400, Tim Johnson wrote:
>Hello Group,
>Has anyone seen the VCO application using the National LM139.
>I ran across it on page 13 of the datasheet and was wondering if the 
>guru's here had any thoughts about the use of the circuit style in general 
>as a synth VCO.
>
>http://www.national.com/ds/LM/LM139.pdf
>
>Thanks
>
>Jim
>
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         -Jim
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