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RE: First filter stage question in amp's PSU

For capacitors in series.
The same charge current flows through both caps.
The voltage the cap charges up to is INVERSELY proportional to the capacitance.
Therefore the 47uF cap will charge to 220/47 = 4.7 times the voltage that the 220uF will charge to.
This is re-inforced by the 100K/470K voltage share resistors.

So a 100V rating for the 220uF is fine.

If that 220uF had 100V across it then 47uF would have 470 Volts across it.

Hope this makes sense to you.

Cheers,
Ian


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