QuestionQUESTION: All works well except when I connect the "FIXED AUDIO" output to a sony
sound system's Phono input the amps are badly overdriven - regardless of
TVs speaker volume setting.
The TV manual says, in essence, to reduce the TV's speaker's output level
and to adjust receiving amp's volume control for an acceptable sound level.
Something is not right here. It appears that the FIXED Audio output is
indeed fixed with no effect when increasing or reducing the TV's speaker
Volume.
Clearly there is a mismatch of some sort. Any help appreciated
ANSWER: It is a fixed output. The only cure is to use a linear potentiometer for a volume control in-lne. This set volume will still be there regardless of TV volume.
I can't think of any other way.
---------- FOLLOW-UP ----------
QUESTION: Thank you so very much. I will build a box with one Pot. for the left and
one for the right sides. I do not have a schematic - so was wondering about
power dissipation and Pot resistance. I don't have an oscilloscope either but
could take a VOM reading across a test resistor to approximate the power
out of the Fixed outputs. Any idea appreciated.
thank you for your quick and clear response.
Hal Hicks in Santa Barbara.
AnswerI'd use a 10K audio(linear) pot and run it at full 10K and slowly lower the resistance to a comfortable level and leave at such. If you can find a dual stacked pot you could have one control or just use two for balance.
The signal (if RCA) is usually no more than 2 Volts p-p.
As long as the input isn't overdriven all will be well.
