automatic audio switch

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=134435
Printed Date: May 12, 2025 at 7:36 AM

Topic: automatic audio switch

Posted By: medievalsoldier
Subject: automatic audio switch
Date Posted: June 25, 2013 at 9:19 PM

I'm installer of police car equipment.
My client want to automatic switch from the car radio to the two-way radio, so they use the same car speakers?
The car is a 2013 Dodge Charger.
Radio is a Motorola cmd1250.
I found a Russsund Automatic Source SelectorAB-3.2.
My question is will this work, or is there a better options?
Please let me know.
Thomas

Replies:

Posted By: racerjames76
Date Posted: June 26, 2013 at 9:01 AM

Speaking strictly from a car audio point of view we accomplish that same goal by using mute wires and/or relays to break open the speaker wires. Is there a wire that goes to ground on the cmd1250 when it activates? If not you might be better off sticking 2 small speakers under the dash or on the sides of the console for this purpose.

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To master and control electricity is perfection. *evil laugh*

Posted By: pts760
Date Posted: June 28, 2013 at 2:49 PM

racerjames76 wrote:

Speaking strictly from a car audio point of view we accomplish that same goal by using mute wires and/or relays to break open the speaker wires. Is there a wire that goes to ground on the cmd1250 when it activates? If not you might be better off sticking 2 small speakers under the dash or on the sides of the console for this purpose.

If the CMD1250 doesnt have a wire that goes to ground when it activates why couldn't you use a Pac TR-7 trigger output module that send a (+) trigger out to the relays with a audio signal and use the relays to break open the speaker wires? Just a idea.

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I drink current, eat ohms, and bleed voltage

Posted By: medievalsoldier
Date Posted: June 29, 2013 at 8:13 PM

Could you tell me hoe to build a relay switch. I have a ruff idea on how to do it. A list of parts would need to build the relay.

Posted By: pts760
Date Posted: July 04, 2013 at 12:20 PM

Sorry it took so long for me to get back to you. I've been busy at work and haven't had much time to do anything. I made a schematic of how the audio switcher would work. I only made the diagram for one speaker but you need two relays for each speaker that's being added. So all you need is some 18AWG wire, SPDT 30/40A relays (number depends on the amount of speakers in the system), and a PAC TR-7. posted_image

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I drink current, eat ohms, and bleed voltage