Originally Posted By: tfabris
In other news, I'm having fun experimenting with different resistor values in the voltage divider.


OK, I think the winning solution was:

- Modify the board so that it was two completely separate voltage dividers with separate grounds. I had noticed that, on the schematic for the TV's speaker outs, there was no connection between left ground and right ground, at least not on the TV's board. So it didn't make sense for the speaker converter board to sum the grounds like it did.

- Change resistor values to 10k 1watt for the R1 slot and 47ohm 1watt for the R2 slot in the voltage divider. That made Vout be about 0.5 percent of Vin.

Sounds about like what I would expect now.
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Tony Fabris