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PSUD (Power Supply Unit Designer)
PSUD (Power Supply Unit Designer)
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Old 29th June 2019, 09:23 AM   #91
DF96 is offline DF96  England
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Join Date: May 2007
Quote:
Originally Posted by eduard
Because usually you will see people adding a small bypass capacitor on a big power supply capacitor. Sometimes adding a low esr capacitor at the output of a regulator can have bad effects. Could something similar happen to a simple power supply? And that is the reason why would use an RC instead of only a capacitor.
A snubber is not a bypass. Most bypass caps do nothing useful; some do harm; a few do some good.

The idea of the snubber is to damp the LC resonance formed by the choke and the capacitors, if necessary. It has some similarity to the problem at the output of a regulator, because there you have a virtual inductor (the regulator output impedance) so a capacitor (which people love to add) can resonate.

Quote:
In my audio documents i have an article written by Morgan Jones where he has done some test with snubbers or just caps positioned across the secondary windings on or across the diodes. HIS conclusion in most cases a 1 nF cap in series with a 1000 ohm resister across the transformers secundary is all you need.
Different snubber in a different position for a different purpose.
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