Archive of the former Yahoo!Groups mailing list: MOTM

Can anyone help me out with this odd little quirk? The PWM pot on one
of my MOTM 300 VCOs is acting strangely - if you set the pulse width pot
to its central position, it outputs a square wave as per spec, and
rotating the PWM depth pot has no effect, but if you move the pulse pot
to, say 3.00 position, then rotating the PWM depth pot changes the pulse
width! (There's nothing plugged into the PWM in socket!) the amount of
effect the PWM depth pot has depends on the position of the pulse width
pot - no effect whatsoever if it's centralised, and increasing effect as
you turn the pulse width pot either left or right? Curious, eh? I've
checked for solder bridges & dry joints, but I didn't find any. Does
anyone have any suggestions?

Thanx!
--
Norman Fay