On 24 Feb 2003 at 17:24, llile@SALTONUSA.COM wrote:

> 6.  Make sure you have a catch diode in parallel with each DC relay
> coil. Make the foil path very short between the coil and the catch
> diode, and use a  fast diode, not a 1N4001.  You may also experiment
> with using no catch diode and using a parallel resistor for this.

I agree with all your points but had a question about this one.

I've always thought (but might be mistaken) that "fast" diodes just
turned OFF faster than regular diodes, and they don't necessarily
turn ON any faster. For a catch diode accros a relay the most
important is turn ON time, right?, so there is no benefit in using
anything more expensive than a 1N400x?

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Brent Brown, Electronic Design Solutions
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eMail:  brent.brown@clear.net.nz

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