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I don't have an oscilliscope and I haven't put the DMM on it yet but can
anyone tell me what output the 'music mute' wire supplies in a Sony
Ericcson
car handsfree system? Does it go low, high or does it pulse?
The mute wire puts out a constant earth.
Depending on the model of phone and car kit it is usually the following
red - +12V ACC
yellow- +12V Constant
Black- Earth
Green- Mute
Cheers
Joe
"Spanky" <labtecs@hotmail.com> wrote in message
news:40a093d9$0$24338$afc38c87@news.optusnet.com.au...
I don't have an oscilliscope and I haven't put the DMM on it yet but can
anyone tell me what output the 'music mute' wire supplies in a Sony
Ericcson
car handsfree system? Does it go low, high or does it pulse?
"Pussynuts" <pussynuts@bigpond.com> wrote
The mute wire puts out a constant earth.
Depending on the model of phone and car kit it is usually the following
red - +12V ACC
yellow- +12V Constant
Black- Earth
Green- Mute
*** If it puts out a constant earth,then how does it do anything except
connect something else constantly to earth???????????????????????????
Brian Goldsmith.
The mute wire is switched to earth when the car kit is used.This is done
by
a minature relay inside the databox.Once the phonecall is terminated the
relay is released therefore removing the earth from the mute wire.
Cheers
Joe
"Brian Goldsmith" <brian.goldsmith@nospamecho1.com.au> wrote in message
news:HC2oc.32964$TT.22430@news-server.bigpond.net.au...
"Pussynuts" <pussynuts@bigpond.com> wrote
The mute wire puts out a constant earth.
Depending on the model of phone and car kit it is usually the following
red - +12V ACC
yellow- +12V Constant
Black- Earth
Green- Mute
*** If it puts out a constant earth,then how does it do anything except
connect something else constantly to earth???????????????????????????
Brian Goldsmith.