Chip amp power supply- a beginners guide

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Hi everyone! I have a question about snubber capacitors. Do I put those before or after the rectifier bridge?

Another question is about varistor. I have transformer that outputs 25v-0-25v. I was thinking to put varistor rated at 60v across two coils. Will that work?

Attaching schematic.

Thank you all!
 

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