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From: "Dave VanHorn"
Newsgroups: sci.electronics.design
References: <729f9.59262$2L.3124655@e3500-atl2.usenetserver.com>
Subject: Re: Zener Diode
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Date: Mon, 09 Sep 2002 23:22:11 GMT
"Redd" wrote in message
news:729f9.59262$2L.3124655@e3500-atl2.usenetserver.com...
> I wanted to energize a 12 volt relay coil only when my
> supply voltage rises to 10 volts or higher so I place
> a 10 volt zener diode in series with the relay coil.
> The relay will not energize when the zener turns on.
> the voltage across the zener is 10 volts but only 2
> volts across the relay coil. The relay coil only needs
> about 35 milliamps to turn on, after that the contacts
> will latch the supply voltage across the coil.
> What am I doing wrong and how can this be accomplished.
Obviously at 2V, the relay coil's resistance does not allow 35mA to flow.
Find out what the relay's minimim guaranteed pull-in voltage is, subtract
that from 12V, and select your zener accordingly.
>
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