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toggle relay with pwm output

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=115314
Printed Date: May 07, 2025 at 12:34 PM


Topic: toggle relay with pwm output

Posted By: stupidpig
Subject: toggle relay with pwm output
Date Posted: July 27, 2009 at 11:21 AM

Need some help on this. I was planned to toggle a relay by the Hi-beam, which is used for both hi-beam and DRL. When I using the DMM to measure the voltage, I found that the Hi-beam is either 12v (Hi) or 7.6v (DRL), and I thought that's going to be ok. But when I hope up the relay, when Hi turn on is ok, but when DRL on, the relay just buzzing and not turn on, so I guess the DRL actually is using PWM instead of just with lower voltage.

How can I solve this issue? I think a capacitor may help, will that work/ If so, how big of the capacitor I should use?

Thanks.




Replies:

Posted By: stupidpig
Date Posted: July 27, 2009 at 2:04 PM
Here is the original diagram. Left relay with 8v pull-in voltage, right one with 6v pull-in voltage.



Posted By: stupidpig
Date Posted: July 27, 2009 at 3:07 PM

posted_image

I added the capacitor to the diagram, will that work?


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