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Switching

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=1712
Printed Date: June 01, 2024 at 9:55 AM


Topic: Switching

Posted By: MXXR
Subject: Switching
Date Posted: July 05, 2002 at 8:35 AM

I would like to know how I can switch a Momentary relay that has to be fed by a Latching relay. The control signal has to be converted from Latching to Momentary with very minimal or no time lag.

Thanks

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EG



Replies:

Posted By: HotRod53F100
Date Posted: July 12, 2002 at 7:35 PM

What you need is an IC called a one shot multivibrator, its a CD4047. It will take an enable signal and will output a single pulse. The pulse is adjustable based on the value of the capacitor and it has no delay. I have some project books somewhere that shows the wiring which is very simple. You can build the circuit on a piece of PC board about 1" square. The IC is available at Radio Shack for about $1.50, a couple of resistors, a 2N2222 transistor and a capacitor driving a relay. The 2N2222 transistor is good for 1 Amp and depending on what you're driving you may not even need the relay.  If you do a search for a one shot multivibrator or a monostable multivibrator, you will find what you need. Give me some more info and maybe I can help. What are you trying to drive, is it resistive or inductive ect.



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HotRod


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