modify constant to momentary

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=126271
Printed Date: May 12, 2024 at 10:34 AM

Topic: modify constant to momentary

Posted By: 3oh6
Subject: modify constant to momentary
Date Posted: February 23, 2011 at 4:38 AM

Hi Guys,

I need a momentary output from a constant negative supply which seems simple enough, but then I need another momentary output when the negative supply switches off. The only problem is that I don't want constantly energised relay coils one way or the other, if that make sense?

Any help on the best way to achieve this would be great :)

Replies:

Posted By: oldspark
Date Posted: February 23, 2011 at 6:40 AM

Solid state circuitry.
IE - electronics; whether logic chips or discrete transistors etc.

Posted By: 3oh6
Date Posted: February 23, 2011 at 6:53 AM

Thanks for your reply. Do you know of any specific circuits that might work for my situation? I'm not too familiar with solid state stuff :)

Posted By: oldspark
Date Posted: February 23, 2011 at 7:29 AM

Pulse Doubler using 4538
PULSE DOUBLER with 74123 & 7486
Simple MAXIM Circuit Doubles Input Frequency

Posted By: scrtcell
Date Posted: February 26, 2011 at 5:27 PM

what exactly are you trying to doooo?

Posted By: hotwaterwizard
Date Posted: March 03, 2011 at 8:47 PM

https://www.the12volt.com/installbay/forum_posts.asp~TID~126322~PN~1

Try this one. Let me know if it works.

posted_image

-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Print Page | Close Window