ASM1 filter self oscillation

[Barry Bernard]

>>
>> >Well, without any special mods, my ASM1 VCF does self oscillate, but it
>> >is an interesting, "raspy" self oscillation.  It sounds completely
>> >different than the 4-pole self-oscillation on my Odyssey, which I would
>> >suspect is a pretty pure sine wave.
>> >
>> >The ASM-1 self-ocillation is a real sound though, and it is stable and
>> >tunalbe to a keyboard CV.
>> >
>> >-troy
>> >
>> >
>>
>>     My filter doesn't self oscillate either. (It almost oscillates). Did you
>> include the diode in the feedback path ?
>
>Yes, I did.  It did not self-ocillate until I trimmed the offset to
>zero volts.
>
>-troy
>

   As a previuos poster mentioned, I was unable to calibrate the filter to
have zero offset throughout the frequency range. I can't remember the precise
offset at left it at, but I think it might have been + - .5 Volts.
   The 3080's I used were some Harris 3080's that I bought from Mouser.

-Barry