Re: [CAD_CAM_EDM_DRO] Relay question about diodes across the coil

On Sat, 10 Jan 2004 21:57:03 -0500, you wrote:

>Jeff,
> On ac the diode cuts the voltage to the coil in half.

Only with the diode in series. If the diode is placed on an AC relay
in parallel with the coil, you will connect the diode across the full
supply on every half cycle.

not recommended.

Harvey

>Happy Hunting
>archie =) =) =)
>
>
>At 02:05 AM 1/11/2004 +0000, you wrote:
>>Back when I was a kid learning about relay circuits on the job
>>(1960's), most of the control circuits I got involved in used low
>>voltage A.C. and I don't ever remember seeing a diode. I just found
>>out that it's good practice to put a diode across the coil of relays
>>to keep them from chattering due to the current stored in the coil
>>inductance. Question is: Only on D.C. relays or is this supposed
>>to be done on A.C. relays as well?
>>
>>Jeff
>>
>>
>>
>>
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>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
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>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
>Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
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>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>bill
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>Yahoo! Groups Links
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>To visit your group on the web, go to:
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