M17-Project/TR-9

Power output

Opened this issue · 5 comments

sp5wwp commented
  1. Power output is limited to 0.75W. At that power, the bias voltage is 2.9V.
  2. There's a high pitched sound audible when PA is active.

ALC circuitry works.

sp5wwp commented

Squeak was eliminated by adding a 10k resistor in parallel to C106.

sp5wwp commented

Maybe we should get rid of Q3 (BGA6589).

tkuester commented

Is this related to issue #8/9 in the errata, about R64 and C106?

sp5wwp commented

@tkuester yes, it is.

sp5wwp commented

The RF lowpass stage (around L9, L10) has to be redesigned.

My proposal:
obraz