What voltage triggers a cell phone mute
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=60611
Printed Date: April 27, 2024 at 7:47 PM
Topic: What voltage triggers a cell phone mute
Posted By: boost n juice
Subject: What voltage triggers a cell phone mute
Date Posted: August 03, 2005 at 2:09 PM
Looking to get a new deck with a cell phone mute feature/wire...I'm going to wire up my X50 radar detector to mute the radio when it goes off...The X-50 has an alert LED mounted on the powercord...The alert LED only turns on and flashes when radar's detected...The alert LED is triggered with 4v negative...What voltage does a cell phone give to trigger the cell phone wire on a HU?
With relays and/or diodes and/or resistors I can get any +/- volage, but I need to match a cell phone's voltage...
Replies:
Posted By: Masta N
Date Posted: August 03, 2005 at 2:13 PM
12 volts negative on most...however there are a few headunits(eclipe) that use positive trigger at 12 volts
Posted By: boost n juice
Date Posted: August 03, 2005 at 2:30 PM
Thanks, also the majority of the HU with these feature are automatic...Meaning as soon as the ground stops sending current, the radar automatically resumes, correct? Or is there I button I have to push on the HU to unmute it?
Posted By: Masta N
Date Posted: August 03, 2005 at 2:47 PM
Alpine, Sony and Eclipse are automatic. I assume that most others are as well. I have only connected mutes on those brands.
Posted By: Masta N
Date Posted: August 03, 2005 at 2:48 PM
Clarion is auto too.
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