relay that works with audio signal?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=10323
Printed Date: August 29, 2025 at 8:16 PM

Topic: relay that works with audio signal?

Posted By: copcarguy
Subject: relay that works with audio signal?
Date Posted: March 02, 2003 at 6:57 PM

Does anyone know of a relay whereby I could trigger 12 volts using an audio signal?

In other words when an audio signal is present I want to turn on 12 volts to an accessory. Picking up the power wire of the audio accessory is no good because it can be turned on without generating an audio signal. Your replies are much appreciated.

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R Jackson
Owner/Installer
TRM Emergency Vehicles
Information is advice only and should be confirmed with OEM or quality test equipment.
Boyertown, Pennsylvania

Replies:

Posted By: the12volt
Date Posted: March 02, 2003 at 7:10 PM

https://www.davidnavone.com/detail.asp?PRODUCT_ID=N-902

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Posted By: copcarguy
Date Posted: March 02, 2003 at 7:18 PM

Thanks 12volt!
I appreciate your help and I always try to help those I can as well. Take care!

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R Jackson
Owner/Installer
TRM Emergency Vehicles
Information is advice only and should be confirmed with OEM or quality test equipment.
Boyertown, Pennsylvania

Posted By: Mr_Mike
Date Posted: March 03, 2003 at 1:26 PM

the12volt wrote:

https://www.davidnavone.com/detail.asp?PRODUCT_ID=N-902

OK, that works with speaker level outputs. Got any idea for line level outputs?

Posted By: the12volt
Date Posted: March 03, 2003 at 1:36 PM

Try a PAC TR-4. Senses voltages as low as 0.8 volts. https://www.go2pac.com

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