closing a relay with an audio signal

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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=129945
Printed Date: May 15, 2025 at 6:19 PM

Topic: closing a relay with an audio signal

Posted By: nizaryousri
Subject: closing a relay with an audio signal
Date Posted: December 30, 2011 at 10:36 AM

is it possible to close a 5 volt jzc-23f(3124) relay using an audio signal coming from a bluetooth earpiece for example ?

Replies:

Posted By: i am an idiot
Date Posted: December 30, 2011 at 11:28 AM

not without an op amp and some more circuitry.

https://www.seattlerobotics.org/encoder/200003/larryb.html

https://www.discovercircuits.com/H-Corner/audio-signal.htm

https://search.yahoo.com/search;_ylt=At.nCUTWDKgrk9iVbJjNCvKbvZx4?p=audio+sensing+circuit&toggle=1&cop=mss&ei=UTF-8&fr=yfp-t-701

Posted By: nizaryousri
Date Posted: December 30, 2011 at 2:05 PM

Thanks a lot! Very informative.

Posted By: howie ll
Date Posted: December 30, 2011 at 5:22 PM

Which is why car kits such as Parrot, Nokia etc are recommended with a 0V output on call initiation to mute radios etc.
At the moment car kits are compulsory in the EU, North America, Australia, New Zealand and Israel. Egypt will follow.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

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