[sdiy] The never ending ASM-1 VCO troubles :-)

[Neil Johnson]

Flo,

> VCO works perfectly (absolutely stable, with a great usable range) but the
> OTHER ONE swings at ~30kHz (which is not much influenced by the control
> voltage).

Check the reset transistor is connected correctly -- I had a similar
experience with my VCO, only to find that the reset transistor was
connected thw wrong way (pinout error on PCB), such that the LM311 was
feeding current into the capacitor...Doh!!  Fixed it, works a treat.

Neil

--
Neil Johnson :: Computer Laboratory :: University of Cambridge ::
http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
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