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Old 9th January 2013, 12:29 AM   #1
prezden is offline prezden  Canada
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Default Sure TPA3122D2 Mods

I have been trying to improve the Sure TPA3122D2 amp with the swapping out of some of the caps for others. As I am new to this sort of thing I would appreciate your comments on the changes I have made thus far:
C16, 17, 19, 20 to 1uF 50V Rubycon
C7, 8, 10, 11 to 470uf 35v Nichicon
C1, 2 to 1uF 275v Panasonic film
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Old 9th January 2013, 12:33 AM   #2
prezden is offline prezden  Canada
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I forgot to add- the sound is a lot better, especially in the lower ranges. Although the bass is still a bit weak.
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Old 10th January 2013, 04:10 AM   #3
prezden is offline prezden  Canada
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Nobody
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Old 11th January 2013, 05:47 AM   #4
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Experiment with different power supply caps and values like ELna Silmic, Panasonic KA, and Nichicon Muse. It's hard to tell what you are using from your pic. Don't know what the smaller caps are there, but if they are MKP or MKT I would suggest replacing with Wima film/foil FKP.

All should be available easily from mouser.
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Old 13th January 2013, 09:56 AM   #5
prezden is offline prezden  Canada
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Thanks wushuliu
It probably sounds pretty dumb but I am not sure which ones are the power supply caps.
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Old 13th January 2013, 03:58 PM   #6
Bare is offline Bare  Canada
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Usually the biggest ones :-) Fit New triple the UF (at least) ones or the biggest you can possibly fit, physical size being the operative limitation, for any hopes of a wee bit better bass.
I'm guessing that any improvements resulted from Adding the 2 film caps.
This isn't the ideal choice amp board contraption for amazing performance potentials.
But you should certainly try, regardless.
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Old 13th January 2013, 05:38 PM   #7
prezden is offline prezden  Canada
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Thanks Bare
I'm slowly working my way up to better boards as I learn.
I am going to replace the 4 1uF 50V Rubycon caps with 470uf 35v Nichicon so they are all the same. The first mods I made were to replace all 8 rail caps (is that the right name) with the Rubycons then I changed 2 of them for the Nichicon.

cheers
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Old 13th January 2013, 09:53 PM   #8
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Put high quality film caps on LIN, RIN, and BYPASS (C1, C2, C14). This will be the biggest factor in improving sound quality. Replace C22 with a larger value electrolytic (100uF or so) and a small resistor (100-220 ohms) between VCC and C22. This will isolate the internal opamp stage from the switching stage.

For more bass, replace the C7/C8 and C10/C11 pairs with a 2200uF (8 ohm speaker) or 4700uF (4 ohm speaker) and make sure the power supply you plug into the board has at least double that value.
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Old 14th January 2013, 09:18 PM   #9
prezden is offline prezden  Canada
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Thanks guys
killerbobjr- Are you suggesting removing the1uF 275v Panasonic film caps on C1 and C2 and replacing them with new caps on L1 and L2?
How would that improve the sound over the film caps?
I am planning on using a 24v Meanwell for the ps. Is this a good choice?

cheers
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Old 14th January 2013, 11:13 PM   #10
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Quote:
Originally Posted by prezden View Post
Thanks guys
killerbobjr- Are you suggesting removing the1uF 275v Panasonic film caps on C1 and C2 and replacing them with new caps on L1 and L2?
How would that improve the sound over the film caps?
I am planning on using a 24v Meanwell for the ps. Is this a good choice?

cheers
It's not clear what those caps are. It would help if you took a picture from another angle. It's difficult to see what you are already have.
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