Paul Joppa
Moderator
The usual recommendation comes from Thorsten (used to be pretty active on the DIYtube and SET boards). If the capacitive voltage divider ultrapath/cathode bypass matches the gain of the output stage, then any noise on the power supply is cancelled by cathode injection. Hard to be exact unless you are driving a constant-impedance speaker like a Magnepan, but roughly a gain of 3 so the ultrapath is 1/2 the cathode bypass. This assumes both are large - let's say, 25uF/50uF minimum for full frequency range.
Note that this does not affect the driver sensitivity to power sully noises - a C4S will solve that, but I wanted to mention it. With a c4S's driver, this is kind of a poor-man's shunt regulator. :^)
I'll be back by the D
Note that this does not affect the driver sensitivity to power sully noises - a C4S will solve that, but I wanted to mention it. With a c4S's driver, this is kind of a poor-man's shunt regulator. :^)
I'll be back by the D
