Using both built in speaker and headphone jack

kb5udf

Member
Joined
Apr 7, 2004
Messages
529
Location
Louisiana
Hi all,

I'm stumped. I'm sure this question/solution would apply equally to radio gear and tv's etc, or really anything with a headphone jack and a speaker.

I have a situation where I would like to have BOTH the speakers on my cheapo HISENSE tv and the headphone jack (to send audio
to larger stereo speakers). The tv is in a rental property and tennants are likely to get confused and complain if they have to navigate
an HTR and don't know how. So I need both the TV speakers active and the headphone out to supply the htr/av receiver. no, this tv does not allow a menu setting
to do this. Yes, I am aware of using the optical out, but that's suboptimal for a variety of reasons in this case.

Surely there must be some hack to stop the TV from detecting/muting when I pull audio from headphone jack. Perhaps someone sells a cable that will do just this, but my googling has been unfruitful.

Thanks in advance

JB
 

KB4MSZ

Billy
Premium Subscriber
Joined
Mar 12, 2018
Messages
362
Location
Tampa, Florida
There are two ways the detection can occur that I am aware of. The earphone output can have a transistor sensing circuit that detects a bias level current on the earphone jack and then switches off the speakers. The other type is that the earphone jack is physically switched when the plug is inserted, turning off the speakers. In this case, it may be possible to bypass this but you would have to be very careful not to send a power level signal through the earphone jack. Doing so would damage any amplifier applied to this circuit.
 
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