12V low power AC/DC PSU - Capacitor bank after regulator?

Whiteybrown · 16th April 2011, 01:24 PM

Hi

I'm in the process of designing a simple power supply for a TA2024 class-t amp, which needs a 12V fixed supply. I've salvaged an old Transformer from a battery charger and measured its RMS output to be 12.8V. My plan is the following circuit:-

Transformer(12.8Vrms)->Full Bridge Rectifier(~16V)->Smoothing Caps->7812 Regulator(2A max)

Now I read that a large capacitor bank is good for audio response, so does having only the capacitor bank infront of the rectifier matter? Or should I put an additional Capacitor after the Regulator. For what its worth I'm making this a quick build and I have 4x6700uF caps on hand only.

Any advice is greatly appreciated,

Matt

metalsculptor · 20th April 2011, 01:06 PM

Capacitors before the regulator.
Regulator must be able to supply the peak current draw of the amplifier. Decoupling capacitors should be used near the amplifier IC.

16th April 2011, 01:24 PM	#1
Whiteybrown diyAudio Member Join Date: Feb 2011	12V low power AC/DC PSU - Capacitor bank after regulator? Hi I'm in the process of designing a simple power supply for a TA2024 class-t amp, which needs a 12V fixed supply. I've salvaged an old Transformer from a battery charger and measured its RMS output to be 12.8V. My plan is the following circuit:- Transformer(12.8Vrms)->Full Bridge Rectifier(~16V)->Smoothing Caps->7812 Regulator(2A max) Now I read that a large capacitor bank is good for audio response, so does having only the capacitor bank infront of the rectifier matter? Or should I put an additional Capacitor after the Regulator. For what its worth I'm making this a quick build and I have 4x6700uF caps on hand only. Any advice is greatly appreciated, Matt

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20th April 2011, 01:06 PM	#2
metalsculptor diyAudio Member Join Date: Sep 2010 Location: Melbourne	Capacitors before the regulator. Regulator must be able to supply the peak current draw of the amplifier. Decoupling capacitors should be used near the amplifier IC.

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