In Reply to: RE: Output Impedance posted by FlaCharlie on February 15, 2025 at 13:16:19:
"So, if a volume pot or a fixed voltage divider is used to reduce the output signal (and associated noise in this case) of the preamp then putting the pot after the interconnect (on the amp) would not increase the output impedance of the preamp. Correct?"That is correct.
"If the preamp is driving a SS or Class D amp does this affect the placement of the volume pot?"
No.
"I assume that there is no Miller capacitance or the equivalent involved in that case. Or is there? "
A transistor has a input capacitance they just don't call it the Miller capacitance but it is very much the same thing.
"Would the resistance in series have the same effect on the output impedance if there was no Miller involved, only the cable capacitance?"
Yes, the output impedance value has nothing to do with the total shunt capacitance value but if there were no Miller capacitance then the total shunt capacitance would be less so the -3db point of the low pass filter would be higher (more out of the way) but that filter would still exist and the output impedance of the stage is still what it is.
Tre'
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Edits: 02/15/25
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Follow Ups
- RE: Output Impedance - Tre' 13:40:12 02/15/25 (0)