Hi all,
I have a BA283 that's drawing too much current (300mA) and oscillating at 75kHz, I think. R7 is getting very hot and scorching the board. I swapped out the 2N3055 and it didn't help. As far as I can tell, the other components on the board seem to be good. All I can think of to do is to start swapping out other components until I get the one that's bad. I think I have enough good polypropylene caps around to replace most of the polystyrene caps, and I have some BC107 transistors I can use to replace the BC184Cs, or some of them, anyway. It doesn't seem very efficient, and I wonder if I'll change the sound by changing the caps. Anyone have any ideas?
Here is a pdf of the schematic:
http://sethglassman.com/BA283AV.pdf
BTW, mine is a filled 283, not the half-filled one in the docs.
Thanks
:sad: :?
I have a BA283 that's drawing too much current (300mA) and oscillating at 75kHz, I think. R7 is getting very hot and scorching the board. I swapped out the 2N3055 and it didn't help. As far as I can tell, the other components on the board seem to be good. All I can think of to do is to start swapping out other components until I get the one that's bad. I think I have enough good polypropylene caps around to replace most of the polystyrene caps, and I have some BC107 transistors I can use to replace the BC184Cs, or some of them, anyway. It doesn't seem very efficient, and I wonder if I'll change the sound by changing the caps. Anyone have any ideas?
Here is a pdf of the schematic:
http://sethglassman.com/BA283AV.pdf
BTW, mine is a filled 283, not the half-filled one in the docs.
Thanks
:sad: :?