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Subject: Re: can someone recommend a flyback zener diode value
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Date: Mon, 28 Oct 2002 22:40:34 GMT
NNTP-Posting-Date: Mon, 28 Oct 2002 17:40:34 EST
Organization: RoadRunner - Tampa Bay
I appreciate all the responses from these really knowledgeable folks. I'm
wondering what kind of zener to use if in fact I should use zeners and
should they be across the coil or the 2N2222? I am just using some 20 or 30
12vdc relays rated at 30amps. I've found that a 1N4764A works great and
they're across the relay coil. Thanks again to all.
> You are trying to get the current in the coil to zero as quickly as
> possible. The rate of change of current, dI/dT = V/L
> Using a zener allows the reverse voltage to be higher, so the time
> to reset the coil gets proportionally shorter.
> In some specialised applications the reverse voltage can be up
> to 500V, to get a really fast relay ;-)
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