100W Ultimate Fidelity Amplifier

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#3,762
After detailed check :magnify:,of traces I find ,only one mistake as usual .
Corrected layout attached below , I will test as soon as I have some time to do this. I will report my results 😉
Regards ,Alex
 

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#3,764
alex mm said:
After detailed check :magnify:,of traces I find ,only one mistake as usual .
Corrected layout attached below , I will test as soon as I have some time to do this. I will report my results 😉
Regards ,Alex
Click to expand...

Very nice to see the evolution of an amplifier 🙂!
Much fun, but a lot of work and time...
Great Job Alex!

regards Olaf
 

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#3,767
44250 said:
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.
Click to expand...

Did you make any changes to the layout? I am having issues on the negative rail on both boards.

Thanks, Terry
 
#3,769
thimios said:
Please share the pdf with us Alex🙂
Click to expand...

Files for PCB of A23 audio amplifier in .pdf format for toner transfer attached....🙂
Regards ,Alex
 

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#3,771
still4given said:
Did you make any changes to the layout? I am having issues on the negative rail on both boards.

Thanks, Terry
Click to expand...

both versions work,one was done by me (with dual op-amp) and the other one by Djera (with single op-amp).

the latest files were only a little bit differente than Djera´s and my and all the difference is in a way of connecting GND from power supply to an amplifier PCB.

my and Djera´s pcb´s (first versions) have only main GND wire that goes from amp-pcb to a ground star of PSU,and newer pcb has PGND that should go with thicker wire to a PSU star GND,and two SGND that can be connected with not so thick wire,again to a star ground of PSU.

both versions should work fine,i just finished dual op-amp version,painted inclosure and wired completly:
 

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#3,772
PCB correction

Sorry ,found another error ,I hope the last one 🙁 It's corrected ......🙂
So new files attached .... Files like : bottom and silk screen printed on transparent film foil can be used in photographic method as well if mirrored.
Regards Alex
 

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Last edited:
#3,774
44250 said:
both versions work,one was done by me (with dual op-amp) and the other one by Djera (with single op-amp).

the latest files were only a little bit differente than Djera´s and my and all the difference is in a way of connecting GND from power supply to an amplifier PCB.

my and Djera´s pcb´s (first versions) have only main GND wire that goes from amp-pcb to a ground star of PSU,and newer pcb has PGND that should go with thicker wire to a PSU star GND,and two SGND that can be connected with not so thick wire,again to a star ground of PSU.

both versions should work fine,i just finished dual op-amp version,painted inclosure and wired completly:
Click to expand...

Here are some pics of one of my boards. Please look to see if you can find any errors. The board will not power up properly. I installed a 500R trimmer since the schematic shows 220R in that position. I didn't have 2W 1R so I installed 5W 0R33 emitters and I used two 1W 6K8 resistors in paralell for the 2W 3k3 resistors.

Thanks, Terry
 

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#3,778
still4given said:
Here are some pics of one of my boards. Please look to see if you can find any errors. The board will not power up properly. I installed a 500R trimmer since the schematic shows 220R in that position. I didn't have 2W 1R so I installed 5W 0R33 emitters and I used two 1W 6K8 resistors in paralell for the 2W 3k3 resistors.

Thanks, Terry
Click to expand...

changes you made are not a reason for problems you have. what op-amp do you use? re-check if there is any unwanted connections and if all the transistors are on their places,tourned as they should be. what to92 transistors do you use?
 
#3,779
44250 said:
changes you made are not a reason for problems you have. what op-amp do you use? re-check if there is any unwanted connections and if all the transistors are on their places,tourned as they should be. what to92 transistors do you use?
Click to expand...

I will have to go back and read though again. I used screenprint from post 3576. I see now that there are new versions. I used TL072. All TO92 are what are called out in the screen print. Without a matching schematic, trouble shooting is very difficult.

Thanks, Terry
 
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