Re: I am about to add an LED to a charger but need further opinions.

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#472

From: Pete
Date: Wed, 15 Mar 2006 04:29

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Ol' Duffer wrote:

>> I have seen some chargers that have the dropping resistor and LED in
>> series  with each other and then this combination is in parallel with
>> another resistor of lower ohms which goes to the battery pack

What I've often seen done is a string of three series diodes in the 
output lead with a LED and series resistor in parallel with the diode 
string.  Just make sure that the diodes can handle the maximum charger 
current.

> Some of the makers who have done this have had trouble with
> blowing out the LED's.  Consider what happens when you plug
> in a dead battery, or maybe even worse a bad one that happens
> to be shorted...

Since a nicad charger is supposed to be constant current, I can't see 
that being a problem unless whoever "designed" it didn't know what they 
were doing...

Peter

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