100W Ultimate Fidelity Amplifier

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#3,722
still4given said:
You also added 1000u+100n to each rail and increased 100u to 220u. Was this under advisement of Mile or did you just feel the circuit needed it?

Thanks, Terry
Click to expand...

i have added 1000u + 100n after fuse, 100uF to 220uF is something i have found on olafk 's pcb,most of VAS part i copied from his A17 pcb and output stage is copied also from olafk 's APEX A20tef. other 100nF capacitors were added by me,they pro-long a life of el. capacitors they are connected in parallel with, and make their esr better (lower).
 
#3,723
Final version of A9 pcb in sprint layout. Removed 3 jumpers and added 100nf bypass caps.🙂
 

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#3,725
44250 said:
i have added 1000u + 100n after fuse, 100uF to 220uF is something i have found on olafk 's pcb,most of VAS part i copied from his A17 pcb and output stage is copied also from olafk 's APEX A20tef. other 100nF capacitors were added by me,they pro-long a life of el. capacitors they are connected in parallel with, and make their esr better (lower).
Click to expand...

So this is not actually the A23 but more of a combination of three amps? Do you have a schematic you can share? I only build these amps to learn. I don't need one more amp. I don't learn much if I am just blindly filling holes on a PCB.

Thanks, Terry
 
#3,726
TEF or tripple emitor follower is (mostly) a kind of output stage,many amplifiers have tef in output. same goes for A23 and A20tef so the pcb in that part shares much similarities - that is why i used that part of olaf´s pcb.

we all have the same schematics,and the fact that i added a few capacitors doesn´ t change basic schematics at all. all i did is put a 100nF capacitor here and there(the goal was to impruve el-cap characteristics) and a 1000uF per rail just to get a bit more stabile rail current on the pcb.
 
#3,727
I see, so no schematic to match this board? There is more than just some added caps. Looks like some sort of protection and maybe a clipping indicator? Like I said, I'm trying to learn. Stuffing parts is holes on a PCB is good soldering practice but not much more without seeing how the circuit works. Maybe if I just needed a good playing amp, but I have too many of those already.

Thanks, Terry
 
#3,732
I see, so no schematic to match this board? There is more than just some added caps. Looks like some sort of protection and maybe a clipping indicator? Like I said, I'm trying to learn. Stuffing parts is holes on a PCB is good soldering practice but not much more without seeing how the circuit works. Maybe if I just needed a good playing amp, but I have too many of those already.

Thanks, Terry
Click to expand...

Terry you can use one of these apex protection from Willy, its also my favorite. Pro from A23 pcb will connect to protection pcb.

Regards, Sonal
 

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#3,735
PCB rev 1.2 for A23

@olafk very good layout , nice compact design .....:worship:
I think just a few members like my PCB rev 1.1 so I decided to try all in line OT for A23 so here it is .....but not tested !
Regards Alex
 

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  • A23 PCB ALL IN LINE.jpg
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  • A23 PCB ALL IN LINE PIC.jpg
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  • APEX A23 ALEX.pdf
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#3,738
Hats off

Sonal, 44250, Alex, Olafk, Juan,
Very inspiring to see examples of your PCBs and how quickly you guys can come up with such excellent work..
and thanks again for the layout files - helps to actually learn hands on PCB layout instead of going straight to etching boards.
Apex, of course, is the Amplifier circuit machine beyond compare - as long as we keep building them he will keep cranking them out - the man never rests !

Thanks for the inspiration guys! It really helps to get the rest of us like me motivated to get off our butts.

Vic
 
#3,739
still4given said:
I see, so no schematic to match this board? There is more than just some added caps. Looks like some sort of protection and maybe a clipping indicator? Like I said, I'm trying to learn. Stuffing parts is holes on a PCB is good soldering practice but not much more without seeing how the circuit works. Maybe if I just needed a good playing amp, but I have too many of those already.

Thanks, Terry
Click to expand...

sorry, i wasn't thinking about that part of pcb: on the right it is "protect indicator" added from APEX-Zack NE555 protection and on the left there is clip indicator. that is added to a pcb but that does not affect the basic schematic of an amplifier or the way it works. i have had a free space on a pcb so that was the best way to use it,at the moment.
 
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