You have also used the hot CL60 which is an option for 220 V.
Hard to see exactly how you have it all wired up.
Hard to see exactly how you have it all wired up.
To test ps board alone, I disconnected from amp boards. Reading plus and minus 26.6v. That's ok.
I guess that's unloaded dc.
When amp boards were connected, output dc was way off and varying up and down.
I had just biased and zeroed out output dc the other day. Only difference is this new board.
Th2 is going to chassis ground like the schematic says.
I guess that's unloaded dc.
When amp boards were connected, output dc was way off and varying up and down.
I had just biased and zeroed out output dc the other day. Only difference is this new board.
Th2 is going to chassis ground like the schematic says.
Board is trashed. Won't survive removing parts.
Vias gone. Going back to store supply. Have too.
Vias gone. Going back to store supply. Have too.
That's a bummer. Where did you get the board made? Usually they'll survive several removals....
PS: if you do try it again, reset your bias. Using the 0R47 power resistors will change the voltage slightly and necessitate a re-bias.
PS: if you do try it again, reset your bias. Using the 0R47 power resistors will change the voltage slightly and necessitate a re-bias.
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The red board does work as designed.
Just don't unsolder parts from it.
I build up the PS on another version of this board and is ok too. Not sure why there was a wild offset. My be it was just me.
Just don't unsolder parts from it.
I build up the PS on another version of this board and is ok too. Not sure why there was a wild offset. My be it was just me.
I have several pcb that I can sell at cost (9 euros) plus shipping. outside Europe, the cost is probably too expensive. More info by PM.
Got a chance to listen to two simulate F7s: one with shared power supply and the dual supply from this thread.
There is a distinct difference and I think the advantage goes to the dual supply.
I can elaborate more but that's really it.
There is a distinct difference and I think the advantage goes to the dual supply.
I can elaborate more but that's really it.
I built up some boards for some projects. First one done is a Rawson built F5 that I recently bought. I measured “as-found” voltages and then gutted it. It sounded great on my bench speakers, and voltages, bias, and gain all check out great.
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I re-rebuilt my Aleph J Mini (original rebuild was to fix the hum and mess from the original Rawson build). The boards I pulled out are going into a buddy’s aleph j monoblocs.
This amp checks out on the bench: PSU voltage, dc offset, bias, gain. Sounds great on test speakers.
This amp checks out on the bench: PSU voltage, dc offset, bias, gain. Sounds great on test speakers.
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I have now built 4 amps with these boards. The 4th was the last one I had, and I may have another project requiring another.
@Jeff - I really like the boards. Quick, straightforward, very nice work!!!
Question to everyone: I'm thinking of making another run of these boards. Anyone interested?
@Jeff - I really like the boards. Quick, straightforward, very nice work!!!
Question to everyone: I'm thinking of making another run of these boards. Anyone interested?
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I have decided to build a couple more amps, and I'm having a batch of these boards fabricated. I expect I will have them mid-August. If you're interested in buying board(s), please let me know.