Hi folks!
IIRC, (in a triode, preamp is only of interest here for now) the plate voltage is out of phase with the grid signal and by placing a high value resistor from plate to grid we get some local NFB.
IIRC, this local NFB can also be achieved simply by using a small value capacitor from the plate to grid. Now, does this capacitor simply parallel the grid-to-plate internal resistance forming a filter network?
What are some of the 'tried and true' values for local NFB in a preamp? Can anyone offer a simplistic explanation of the theory involved with this technique? I would be very grateful for any contribution concerning this. Regards,
TS
IIRC, (in a triode, preamp is only of interest here for now) the plate voltage is out of phase with the grid signal and by placing a high value resistor from plate to grid we get some local NFB.
IIRC, this local NFB can also be achieved simply by using a small value capacitor from the plate to grid. Now, does this capacitor simply parallel the grid-to-plate internal resistance forming a filter network?
What are some of the 'tried and true' values for local NFB in a preamp? Can anyone offer a simplistic explanation of the theory involved with this technique? I would be very grateful for any contribution concerning this. Regards,
TS
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