DIYbanter - View Single Post

On 5 Sep 2003 06:12:39 -0700, (Michael Murray)
wrote:

Background:
I have a portable TV which I want to add a headphone socket to.

Plan:
Open TV.
Find wires (probably just 2, I doubt it a 14", £80 TV has stereo)
Add chassis mounted switch to the live (?) wire.
Add chassis mounted headphone socket to the casing
Wire the socket to the other 'side' of the switch

This will (I hope) leave me with a TV which I can switch between
headphone and speaker modes.

I did this to a small portable TV 15 years ago - I used a 5 terminal
socket ( stereo & it disconnected 2 terminals when a plug was
inserted). As other people have warned, one or more of these contacts
could be at live potential, I didn't check, because I was using an
audio isolating transformer (I think it was from Tandys).
I had to move the loudspeaker connections to the other side of the
transformer (so the cut-out would work correctly). Trouble was the
transformer lost some power, so you had the turn the volume up louder
than before, which caused it to distort if you wanted it loud (but
normal viewing was ok).

Tony.