Re: TTL Questions

Article View: sci.electronics

Article #17834

#17834

From: Rex Jolliff
Date: Mon, 20 Jul 1987 10:05

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In article <1008@speech1.cs.cmu.edu> (Paul Dietz) writes:
>In article <1395@crash.CTS.COM> rpluth@pnet01.CTS.COM (Ron Pluth) writes:
>>    1.  What's the easiest way to go about interfacing a TTL
>>output (from, say, a standard S or LS AND gate) to a relay, for
>>...
>...
>A much easier solution is to use a low current, 5-volt relay. Then almost
>any of the serious driver chips can drive it directly.

Shouldn't you shunt the relay with a diode to prevent back-emf spikes??
(I don't exactly remember... It's been a while since I've done something
like this...)

>
>
>Paul H. Dietz
>Carnegie Mellon University

this
is
line counter
food

-- 

Rex Jolliff  (rex@otto.UUCP, {akgua,ihnp4,mirror,sdcrdcf}!otto!rex)
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References: <1395@crash.CTS.COM> <1008@speech1.cs.cmu.edu>

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!ut-sally!utah-cs!utah-gr!stride!tahoe!unsvax!jimi!otto!rex
From: rex@otto.COM (Rex Jolliff)
Newsgroups: sci.electronics
Subject: Re: TTL Questions
Message-ID: <502@otto.COM>
Date: Mon, 20-Jul-87 06:05:58 EDT
Article-I.D.: otto.502
Posted: Mon Jul 20 06:05:58 1987
Date-Received: Thu, 23-Jul-87 06:46:27 EDT
References: <1395@crash.CTS.COM> <1008@speech1.cs.cmu.edu>
Reply-To: rex@otto.UUCP (Rex Jolliff)
Distribution: na
Organization: Las Vegas Sun
Lines: 31
Keywords: relay driver diode
Summary: you forgot your diode...

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