the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

Relay To Power PA Speaker When CB Radio Is Powered


Post ReplyPost New Topic
< Prev Topic Next Topic >
mikeeey1337 
Member - Posts: 12
Member spacespace
Joined: April 22, 2020
Location: Washington, United States
Posted: October 23, 2021 at 12:31 PM / IP Logged Link to Post Post Reply Quote mikeeey1337
I have a CB radio with constant 12V going to it, it has a power knob on the unit itself to turn it on.
I also have a PA speaker with a built in amplifier. It uses a positive and negative to power the speaker, and it uses 2 signal wires that go to a 3.5mm audio jack that plugs into the CB. I don't want constant 12V going to the PA because it will always have a draw, even when not in use.
I'm trying to figure out if there's a way to make a relay that is triggered when I turn on the power knob of the CB radio, which would then supply power to the PA, and I'm drawing a blank.
I also used a multimeter to test if the signal wires of the 3.5mm audio jack carry any voltage when the CB is flipped to PA mode and PPT is held on the mic, but it does not. I was hoping if that were the case I could trigger the relay with the audio signal by holding down PTT.
I briefly considered running the trigger of the relay in series with the 12V power to the CB, and when the CB power knob is turned on it would complete the ground and trigger the relay? But doing that means I'm running ALL of the current of the CB through the coil first and would likely fry the relay right?
If this is not possible then I suppose I could just go the route of powering the PA with ignition or a seperate switch.
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: October 24, 2021 at 7:54 AM / IP Logged Link to Post Post Reply Quote i am an idiot
You will have to go inside the CB and find the wire on the power switch. It will be easy to find. Open it up and post pictures of the volume knob/switch and I can point it out to you.

If you wish to post a reply to this topic, you must first login.
If you are not already registered, you must first register.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Thursday, October 31, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer