> What voltage and current specifications should the diode
> across the relay coil have for a relay pulling 400 mA at
> 15V dc?

A coil tries to maintain its current, so when the driver switches off
the current will be 400mA. When the driver is switched on the diode will
see a reverse voltage of 15V.

So a 15V/400mA diode would do. But I would pick an 1N4004, becase that
is my 'mid-current' yellybean diode.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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