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From: "Dave VanHorn"
Subject: Re: ceramic caps across the diodes on a bridge rectifier
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Date: Sat, 21 Sep 2002 23:53:49 GMT
> We see that increasing C reduces dV/dt and V. Without an added
> capacitor as Martin suggests the only capacitance helping us is
> a low diode back-bias capacitance and the transformer's small
> winding capacitance. Without any additional capacitance, it's
> possible for a 50V spike lasting 5 to 20us to occur once every
> ac half-cycle, not a good idea inside quiet audio equipment!
I've seen bridges without the caps produce visible hum bars in low VHF
channels (50-70 MHz).
It would be a real shame to have an otheriwse good design flunk part 15
because of that!
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