Dual power supply 30 0 30 volt

Thread Starter


Joined Aug 28, 2021
After converting 30 0 30 Ac 5A dual supply to DC with 4 Diodes and two 10000uf Capacitors I get DC out dual supply of 46 0 46 volts . How to regulate this dual supply to get stable 30 0 30 v . This supply is to be used for an Amplifier


Joined Jan 8, 2017
The capacitors will tend to charge to the peak value of the sine wave. This will be root 2 x the RMS value
So 30 volts RMS will be about 42 volts peak. Also I assume you have very little load on the output so the output voltage of the transformer will be higher than when it is loaded to it's full rating of 5 amps.



Joined Nov 6, 2012
Is ~46-Volts more than your Amplifier can withstand ?
If your Amplifier will operate properly with ~46-Volts, then regulation is not necessary.


Joined Aug 7, 2020
A decent design of power amplifier has more than enough Power Supply Rejection Ratio to run on an unregulated supply.
As music has a high crest factor, you get more value for money off an unregulated supply as the amplifier can supply the peaks without pulling the supply down too far.