[sdiy] Signals leaking into the PSU?

[Mike Bryant]

> I agree try to start small here to limit inrush current.

This is an advantage of a capacitance multiplier on each rail as the capacitor is charged through a resistor.  Most normal interference from outside doesn't get through the pass transistor.  If the power supply feeding the module droops then charge from the multiplier capacitor flows through the base-emitter to keep your circuit running properly, and if it's your circuit creating the hit, that capacitor also discharges a bit before you start loading down the main PSU, and your hit on it is smoothed out a bit, as is the recharging of the capacitor afterwards thanks to the resistor.
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