The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Dave VanHorn"
Subject: Re: Zener Diode
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
NNTP-Posting-Date: Mon, 09 Sep 2002 18:22:11 CDT
Organization: Giganews.Com - Premium News Outsourcing
X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers
X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly
Date: Mon, 09 Sep 2002 23:22:11 GMT
"Redd" wrote in message
> 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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup