[sdiy] Signals leaking into the PSU?

[Chris McDowell]

Had never run into a capacitance multiplier before, Mike. At least I thought that until I looked at it ;) This is just one of them there "slow emitter followers" :P yessir 

> On Feb 20, 2023, at 1:21 PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 
>  
> > 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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