It would seem that the 'highpoweraudio' discount code has expired. No doubt another one will be along soon...
I also updated the writeup for this TPA3255 design on 360customs:
TPA3255 / TPA3251 / TPA3245 Rev.1B Final – #360customs
TPA3255 / TPA3251 / TPA3245 Rev.1B Final – #360customs
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Attachments
Nice bit of work! I just stole all the magnetics out of a couple dead computer PSU's. Might try my hand as well.
I am contemplating building a 3251-based amp as a birthday present for a friend to replace his old Marantz PM-54 integrated. I need to do this fairly cheaply and was thinking to use the 3e 3251 stereo board (i've got other more involved projects with 3251, but those will have to wait a bit).
My question relates to power supply. I have some capMX boards lying around unused i was thinking i might employ. Since the amp board only needs a single rail supply, this could make a fairly compact solution as i see it. But would a capMX such as Juma's (using irfp240 rated for 20A) be able to handle full power draw? I don't expect him to use full power of the amp, but i assume it is foolish practice not to use a power supply rated for at least that.
As for transformer, would a 300VA be sufficient i wonder?
Or would it be cheaper (and just as good) to just go for a connex/meanwell 300W supply? I know that's what a lot of people do here...
My question relates to power supply. I have some capMX boards lying around unused i was thinking i might employ. Since the amp board only needs a single rail supply, this could make a fairly compact solution as i see it. But would a capMX such as Juma's (using irfp240 rated for 20A) be able to handle full power draw? I don't expect him to use full power of the amp, but i assume it is foolish practice not to use a power supply rated for at least that.
As for transformer, would a 300VA be sufficient i wonder?
Or would it be cheaper (and just as good) to just go for a connex/meanwell 300W supply? I know that's what a lot of people do here...
My modifications :
10.
10k 1% instead 10k 5%
hi sybic
which resistor do you mentioned at point 10??
All in the audio signal path at the opamps. I use 0.5% from Susumu at this. (Thin film)
https://www.susumu.co.jp/english/product/category.php?cid=5?cid=5
If you need it "better" use RG or RS series which mainly have tighter tolerance and lower TC.
https://www.susumu.co.jp/english/product/category.php?cid=5?cid=5
If you need it "better" use RG or RS series which mainly have tighter tolerance and lower TC.
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What voltage does your supply provide?
You may use the SHUTDOWN function of the amp to mute while power-up/down.
I once made a fix for the blue PCB version like shown in the picture.
It's located on the right side next to the heatsink. If yours look different, send a picture of that region.
Wire a switch between these two points for manual muting the amp.
Doc, thank sharing SHUTDOWN function suggestion for mute...
FX502Spro is really great sounding amp, having auto-mute would make it perfect, I am amateur on how to do it...
Is it possible to implement an automatically mute function during power-up/down for FX502Spro? How to go about?
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