It pains me to do this, but I need more input ( on the board layout) than I'm currently getting on the original thread where this amp was developed:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=108860&perpage=25&pagenumber=13
This is a low distortion, high power (150+watts @ 8 ohms) design. It's a two sided board, with a poured ground plane on the top. It uses 56 volt rails and has on board power supply (bridge, smoothing caps, rail fuses).
Please take the time to check it out and give me suggestions as to how to improve it.
In the pic below: board on the bottom has the ground plane added. Board size is about 3" x 8" (7.5cm x 20cm).
I will post the schematic next.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=108860&perpage=25&pagenumber=13
This is a low distortion, high power (150+watts @ 8 ohms) design. It's a two sided board, with a poured ground plane on the top. It uses 56 volt rails and has on board power supply (bridge, smoothing caps, rail fuses).
Please take the time to check it out and give me suggestions as to how to improve it.
In the pic below: board on the bottom has the ground plane added. Board size is about 3" x 8" (7.5cm x 20cm).
I will post the schematic next.
Attachments
Re: Couldn't help pointing out...
Hi Gajanan,
I tried to make the rails as short and wide as possible, while still leaving space for the output devices to mount to the heatsink. I thought that I'd struck a pretty good compromise since in many designs, these leads are wire from PS board to amp board - wires that may be twice that length and possibly too thin.
gmphadte said:
Hi Gajanan,
I tried to make the rails as short and wide as possible, while still leaving space for the output devices to mount to the heatsink. I thought that I'd struck a pretty good compromise since in many designs, these leads are wire from PS board to amp board - wires that may be twice that length and possibly too thin.
Personally I would keep the main supply capacitors + rectifier off board. Then I would have the power connections from the supply to the amp as near to the output transistors as possible, with some local decoupling.
If you really want to do it this way, then the one layout I have seen that impressed me in this regard was SuzyJ's power amp. She has the layout available on her site:
http://www.littlefishbicycles.com/poweramp/index.html
If you really want to do it this way, then the one layout I have seen that impressed me in this regard was SuzyJ's power amp. She has the layout available on her site:
http://www.littlefishbicycles.com/poweramp/index.html
gmphadte said:
No, I'm not the best judge, just a raw amateur.
I thought about putting the supply caps on either side of the board, but decided against that, as then there would be long leads from the bridge.
I was thinking the ideal place for the power supply was on the other side of the heatsink., but this would severely cripple chassis layout, convection and increase board size dramatically.It would be just as well to use a separate PS board as to do that.
Again, I think I have struck a good compromise here. The lead from the negative rail is a bit longer than the positive rail, but I don't see that as a problem.
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