[sdiy] Diode reverse polarity protection revisited

[Harry Bissell]

BTW a Schottky (power) diode is a better choice for the shunt diode, it has a much lower
forward drop and leakage is no problem here...

H^) harry


----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Justin Owen' <juzowen at googlemail.com>, 'SDIY List' <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 11 Jan 2011 13:11:31 -0500 (EST)
Subject: Re: [sdiy] Diode reverse polarity protection revisited

> In anti-parallel I get no voltage drop (advantage) but when the input
> voltage is reversed I get a) -1V at the Cathode and b) within seconds the
> diode is too hot to touch.
> 
> ...can someone explain the benefit to this method over running it in
> Series? Right now I'm not seeing it.

Refer to my last post.  This is exactly what the polyfuses protect against.

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-- 
Harry Bissell & Nora Abdullah 4eva