[sdiy] Diode reverse polarity protection revisited

Tim Ressel madhun2001 at yahoo.com
Wed Jan 12 19:24:02 CET 2011


A few notes:

A Schottky diode can have lower V drop, but be careful: Check to make sure the 
diode you choose has a decent drop in the current range you will be seeing. I 
got burned by this.

10 Ohm series resistors: A good idea, but two things. One, 10R is a ballpark 
value. If your module is pulling 400mA you will get 400mV of drop. And all the 
current noise will be converted to voltage noise. Which leads to the second 
point: you HAVE to provide enough filtering to correct for that noise. 



--TimR



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