- Jan 1, 1970
I can't find anything more than 5mV of noise or voltage variation
anywhere with the scope. I tried grounding the probe to both the main
supply ground and at op-amp gnd (and measuring around). Even when
that noise on the input to the op-amp, the cap on its output seems to
slow everything down enough to not let the noise affect the MOSET's
My (possibly) exceeding the total dissipation rating of the FET isn't
a possible cause for the popping of FETs too? Still don't know if my
calculations and assumptions about linear derating factors are right.
You can get oscillations at pretty high freqs (>50 MHz) that will
cause problems. A ferrite bead or small valued resistor in series with
the gate lead can help some oscillation problems. Make sure you use a
scope that can see above 100 MHz.