|5th July 2011, 09:25 AM||#11|
Join Date: Jul 2004
Location: Scottish Borders
The HF transient current drawn by an amplifier is fed from the HF decoupling (ceramic or MKT).
The MF transient current drawn by an amplifier is fed from the MF decoupling (electrolytic).
The steady state or LF current drawn by an amplifier is fed from the main smoothing bank.
If the main smoothing bank is located remotely from the amplifier it may be necessary for sound quality reasons to add in some local smoothing at the amplifier. Consider the cable linking the remote smoothing to the local smoothing as a lossy inductor with some resistance.
Your PSU then becomes rCLr"C"L"c (yes, a three stage RCRCRC supply), where r = resistance feeding the first capacitor bank (transformer+wiring), C = first capacitor bank, Lr" = umbilical inductance and resistance, C" = local capacitor bank, L" = PCB trace inductance, c = decoupling.
regards Andrew T.
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