Burned audio transistor?

[Silver Dollar]

I just fired up my HH and the timings are good. The signal out of the preamp is good.

But when I adjusted the volume pot Q11 smoked! Should I add a 10 ohm resistor in
series with the speaker? I'm using a tiny laptop 8 ohm speaker for now.

[Ridh0]

Same problem with me ....
Please advise

[Ridh0]

I just fired up my HH and the timings are good. The signal out of the preamp is good.

But when I adjusted the volume pot Q11 smoked! Should I add a 10 ohm resistor in
series with the speaker? I'm using a tiny laptop 8 ohm speaker for now.

[ATTACH]32160[/ATTACH]

Same problem with me ....
Please advise

[Stevedbk]

I just fired up my HH and the timings are good. The signal out of the preamp is good.

But when I adjusted the volume pot Q11 smoked! Should I add a 10 ohm resistor in
series with the speaker? I'm using a tiny laptop 8 ohm speaker for now.

[ATTACH]32160[/ATTACH]

I have the same problem. I re built the audio again -twice- in different format pcb manhatten protoboard to some what avoid a construction error.
but the same problem.....
Steve

[Stevedbk]

Just found some information of the start of this thread.
https://www.geotech1.com/forums/foru...t-doesn-t-work
Thanks Steve