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Momentary to Constant Relay

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=83514
Printed Date: May 10, 2025 at 2:38 PM


Topic: Momentary to Constant Relay

Posted By: eKuL_135
Subject: Momentary to Constant Relay
Date Posted: September 29, 2006 at 6:59 PM

Hi Guys,

I have followed the instructions on the website in regards to a momentary to constant relay.  Works great, however I am using it for an RFID door access kit which only gives off a 1 sec pulse to open an electric strike, I need it longer than that so this relay setup works great for that.  The problem I have is I need the constant 12v to be turned off once the door has been opened.  The strike has a monitoring microswitch in it, so I have earthed that so once the door is open the microswitch engages and earth flows through to the 12v constant output and thus shorts it out and everything works fine.

I'm not really sure if this is ok to do, I mean it works fine however is there a better way to do it ?

Any comments appreciated.

Cheers

ekul_135




Replies:

Posted By: hotwaterwizard
Date Posted: October 15, 2006 at 1:22 PM
Shorting out everything is not a great Idea. You could use a relay to switch off the circuit when the door is opened.

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


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