When you measured 18v on the speaker terminals, was that across the two terminals or on each terminal referenced to ground?
When you drive a signal into the amp, do you see audio on any terminal of U9?
When you drive a signal into the amp, do you see audio on any terminal of U9?
Across the speaker terminal, it is actually -18v, had my probes the wrong way around
no audio on the 5470 ic
no audio on the 5470 ic
No, it does not have a switch
adjusting the gain pot, I now have audio on pin13 of the 5470 and a square wave on pin14
adjusting the gain pot, I now have audio on pin13 of the 5470 and a square wave on pin14
Are the pins used the same as in the 9001 diagram?
If you remove the jfet, do you get audio to the 4080?
If you remove the jfet, do you get audio to the 4080?
yes, pins are same
removed the jfet, i have audio on the hip4080
and audio at the speaker terminals
removed the jfet, i have audio on the hip4080
and audio at the speaker terminals
I'm not sure. We can deal with that later. The DC offset is too much.
If you connect a load across the terminals, does the DC offset decrease?
If you connect a load across the terminals, does the DC offset decrease?