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Old 15th July 2010, 10:23 AM   #1
Gopher is offline Gopher  United Kingdom
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Join Date: Nov 2005
Location: UK
Default Gainclone PSU - Query for Peter Daniel

Peter

In some of your posts and other material I've seen refer to the use of a 4.7uF electrolytic cap from +Vs to PG+ and from -Vs to PG- immediately after the bridge in a gainclone PSU.

What's the purpose of this cap? Is it meant to be a bypass for the larger main PSU smoothing cap? If it is, why is it located remote from the larger cap? If it's not for that, won't any effect it has be swamped by the larger cap?

I also see values of 4.7uF - 10uF and BG-N non-polarised, FC polarised or Rubycon ZA/ZL polarised mentioned. What's your current recommended value/type for this cap.

Thanks in anticipation

Gopher
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