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Old 30th October 2007, 12:40 AM   #1
diyAudio Member
Join Date: Jul 2003
Location: Indiana
Default Need help With Pi Filter For Power Amp!

Hello To All:

I have a B&K ST140 power amp, and am exploring ideas
to improve the power supply. The supply consists of the
usual full wave rectification and a pair of 17000 uF 75VDC
filter capacitors feeding the boards. My questions:

1. Could I do better with a "Pi" supply filter to improve
the ripple rejection without sonic problems?

2. If so, how would I go about deciding the values of the
2 capacitors (in uF), and the value of the resistor?

Any help or references here would be greatly appreciated!

Thanks in advance!

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Old 30th October 2007, 12:45 AM   #2
diyAudio Member
Join Date: Mar 2007
Location: Canandaigua, NY USA
IMO, the resistor will cause a voltage drop during sustained passages. Probably better to consider a choke, but I've never tried it on a solid state amp.
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Old 30th October 2007, 01:09 AM   #3
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Cloth Ears's Avatar
Join Date: Dec 2001
Location: Melbourne, Australia
Try these.
"It is impossible to build a fool proof system; because fools are so ingenious."
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