sheriffp@spock (Peter Sheriff) (12/05/89)
I am not really hot in electronics (my training was in tubes and
early transistors and not a whole lot of that). What I need is a good
way to get better sound from a cheap color TV. There are no convenient
audio outputs on the outside of the case. I was thinking of tapping
across the terminals of the (tiny) speaker and connecting this to the
auxiliary input of my stereo. Will this work?
An alternative would be to just add a better speaker across the existing
one. If this is possible, should I disconnect the old speaker or just
parallel them together. Also what should I watch for in the way of
impedances?
I would hate to blow the output stage of the audio amp so if anyone
can help I would be very grateful.
Thanks
Petebill@videovax.tv.tek.com (William K. McFadden) (12/09/89)
In article <1568@limey> sheriffp@spock (Peter Sheriff) writes:
->What I need is a good
->way to get better sound from a cheap color TV. There are no convenient
->audio outputs on the outside of the case. I was thinking of tapping
->across the terminals of the (tiny) speaker and connecting this to the
->auxiliary input of my stereo. Will this work?
Watch out! Most TVs have a hot chassis. Connecting this to your stereo will
certainly pose an electrocution hazard. You must use a coupling transformer
for the audio (some TVs already have this built in, but don't count on it!) or
plug the TV into an isolation transformer. If the TV has a headphone jack,
you can plug into it -- it's already isolated.
-> An alternative would be to just add a better speaker across the existing
->one. If this is possible, should I disconnect the old speaker or just
->parallel them together. Also what should I watch for in the way of
->impedances?
This will work as long as there is no way to come in contact with the speaker
terminals (see warning above). You will probably want to disconnect the old
speaker, because it probably doesn't sound very good, anyway. The new speaker
should have the same impedance as the old speaker, if possible.
--
Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077
UUCP: bill@videovax.Tek.com, {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
GTE: (503) 627-6920 "The biggest difference between developing a missle
component and a toy is the 'cost constraint.'" -- John Anderson, Engineer, TI