Pro-668: Headphone Jack Malfunctioning

GrumpyGuard

Member
Joined
Oct 6, 2003
Messages
613
Location
Oregon
My Pro-668/WS1088 developed an issue. When I plug in my headphones or a 3.5mm cord to plug into the aux on my car's head unit the squelch opens and the speaker goes to full volume and then some. The display starts to flash and the battery icon shows the battery is drained. When I unplug the headphones the radio quiets down and operates normally. Any suggestions as to what the problem is and any possible solutions, other than the obvious of not plugging in the headphones.
 

n0nhp

Member
Premium Subscriber
Joined
Dec 1, 2005
Messages
730
Location
Grand Junction
To extend battery life and create more audio, the audio from the hand-held devices is what is called "Balanced Transformerless audio". This basically means that the "ground" side of the audio out is not ground. I am assuming you are using a power cord to save/charge your batteries. By plugging in the external audio on your stereo system you are pulling the audio chip in the scanner to an unbalanced condition.
You need an audio isolation transformer to mate the scanner to the radio so the ground is broken but the audio passes.
A quick search on ebay or amazon will provide multiple choices. Most of the manufactured solutions will be stereo using RCA plugs. ex: PYRAMID NS20 15 AMP CAR AUDIO RCA NOISE FILTER SUPPRESSOR ISOLATION TRANSFORMER | eBay

You can use adapters or if you are handy, buy just the transformer and solder the plugs and cables yourself.

Bruce
 
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