Cgs synth

It's not right.

>First, the LF356 are running warm, which usually only troubles me if the
>circuit doesn't work either. Should they get warm if it works fine?

I would not expect them to get warm.

>Second, the outputs step up and down by around 10mV in sync with pin 12 of

the 4024.

>With no input, it steps between 90mV and 100mV.
>
>This stops if I pull out the clock, so it's not coming in through the
>power rails. This pcb trace is pretty small and I can't see anything
>wrong along it. Anyone ever seen this before? How can this signal
>get into the outputs?

I suspect it is a power rail issue, but on this PCB only. Did you use beads
or 10R resistors as power rail isolation? If you used the resistors, try
shorting them out. Increase power rail decoupling. Check your power rail
voltages. It sounds like the LF356 are are drawing too much power for some
reason. Not a bad batch per chance?


Ken
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Ken Stone sasami@...
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