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relays to make lights to pulse to music?

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=110484
Printed Date: May 14, 2025 at 8:57 AM


Topic: relays to make lights to pulse to music?

Posted By: b1b2b3
Subject: relays to make lights to pulse to music?
Date Posted: January 09, 2009 at 1:04 AM

Hi all,

I was wondering, would it be possible to adapt this 'special application' of relays - https://www.the12volt.com/relays/page5.asp#rtol - to be able to turn lights on and off to the beat of the music?
The way I would do this is to splice a new wire onto one speaker wire, and use this as the signal lead (pin 86), and then the other pins will remain as standard (pin 85 ground, pin 87 12V and pin 30 to the lights).

Will this work?

Thanks



Replies:

Posted By: i am an idiot
Date Posted: January 09, 2009 at 1:58 AM
No.



Posted By: b1b2b3
Date Posted: January 09, 2009 at 2:03 AM
i am an idiot wrote:
No.


Why not?



Posted By: i am an idiot
Date Posted: January 09, 2009 at 2:09 AM
For one, the relay you are wanting to use has a coil rated at 12 Volts DC. The signal coming out of your amp is AC Voltage.



Posted By: KPierson
Date Posted: January 09, 2009 at 8:11 AM

An electromechanical relay also won't work for this applicaiton because of it's slow switching speed.

You'll need an interface circuit that is triggered by the music (I would sugguest somehow tapping in to the low level signal, not the speaker output) and then controls either a solid state relay or a transistor output. 



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Kevin Pierson



Posted By: hotwaterwizard
Date Posted: January 11, 2009 at 4:38 PM
12v_color_organ.gif

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


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