[sdiy] my vco is TOO alive

[Dan Snazelle]

one of my vco's, a CGS (ken stone) vco, which is being run off a +/- 12volt supply and has a tempco in place, lately has been exhibiting a LOT of instability. This started a few months ago and it sounds like there is a gremlin inside of it that is messing with its stability.

i am all for organic VCO's but this is too much. The note you are playing almost always starts dipping in pitch after a few seconds.

it's not that it isnt IN TUNE with itself, it is, and the last time I checked i think i was getting around4 ot 5 octaves of tracking.

The issue is more about WARBLE. the notes droop and have odd amounts of vibrato added as i hold a note.

so..my question is...what could cause a healthy VCO to start sounding like it's dying?


I have about 5 or 6 other modules running off the same PSU and none of those modules are showing any of the same problems.

Could it be 

Bad caps?
Ripple?
(the PSU is rated for at least .7 amps)
Or something I cant even fathom?

Up till this point, i had been very happy with this VCO and found it very flexible.
But now that i cant hold a note for too long without it dipping in frequency, it doesnt work too well with my other VCO.


ANY advice appreciated!

thanks

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