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Re: OT: 9V Sample and Hold

2005-08-31 by fforbesuk

> So far I have it breadboarded. I'm not sure if this maybe part of the
> problem. The .05 cap between the two FET's doesn't seem to hold the
> charge or doesn't charge up. I'm not sure what I'm missing.

From a quick look,i'd suggest the gate of the fet has no ground
reference;it's floating in space at the moment.Stick a resistor to
earth from the gate.Then the 555 goes high,lifts the gate and fet goes
about its duty filling the cap.
But i'm no expert.Did spend a lot of hairpulling during my s/h
construction,ended up using the peter grenader s/h on his site,which
works spot on.

Robert

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