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Old 25th September 2012, 08:19 AM   #121
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Join Date: Feb 2012
I've been reading about these things and it sounds like my rookie mistake was to not discharge the capacitor. It wasn't even plugged into the main board at the time or the mains so that side is okay. I may even be able to just wire up the main board directly. I suspect that the thing that popped is the scr that i think is used to swap between the battery input and the mains.
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Old 25th September 2012, 08:36 AM   #122
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Heya kp, yea I'm okay with it, it was a rookie mistake to not discharge the capacitor before working on the board, it wasn't plugged into the other main board or the mains at the time. There's a scr and zener diode on there that Jan says may have blown. This is a photo of the smaller board:-


not sure how I'll work out or remove the tiny components on the top of the circuit board.

Is there a good thread on diyaudio or another forum where I could get some help, don't want to clutter this one up with my ramblings..
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Old 8th October 2012, 07:52 AM   #123
McDark is offline McDark  Russian Federation
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just ordered the kit ($40), it will take 1-2 weeks. Looks like they assembling them on demand.
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Old 26th November 2012, 06:55 PM   #124
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Any updates?
Thank you!
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Old 26th November 2012, 07:10 PM   #125
rsavas is offline rsavas  Canada
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Join Date: Aug 2012
Location: Ontario
Updates, from whom?
My TPA3100D2 implementation is working fine, have it running all day & night. It drives my Dynaudio Gemini speakers very well. For a class "D" amp, used for casual listening, at realistic volumes, it is a fine chip.
I'd like to try out the TPA3118 family as well. Anyone else try out this part?
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Old 26th November 2012, 11:53 PM   #126
kp93300 is offline kp93300  Malaysia
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Join Date: Mar 2007
I recently build a linear regulated power supply based on this circuit from Just one thing about music - when it hits you feel no pain . I use the 3 pin regulator part 4 description and replace lm318 with lm338 . The trans is about 250 W , 22V ac out . There is a snubber of 0.47r + 47 UF at the output of the regulated supply -- this is the value based on the circuit for regulated gainclones by Carlos FM.
the sound is more tube like and holographic when compared to smps laptop power supply.


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Old 27th November 2012, 08:07 AM   #127
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Originally Posted by rsavas View Post
Updates, from whom?...
I was hoping to see if McDark had received his board and was interested in his opinions. Apologies for the cryptic post.

P.S: If someone improves on the eval board and designs a new PCB, I'm in.
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Old 2nd December 2012, 04:23 AM   #128
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Default Group Buy for Board

Hi, I have found a company in NZ who are prepared to do low run boards, about (20 is the min). Estmated cost would be between US$35-$45 each.
I some one can design and post a layout, I can pass it on and get a confirmed quote.
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Old 2nd December 2012, 05:58 AM   #129
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Join Date: Nov 2007
Location: Dallas
Originally Posted by kp93300 View Post
This are the motor run cap that use. Rather cheap parts.
I tuned it by ear. The 2 biggest caps are the motor run caps with values 0f 1 uf and 5 uf.

The second picture is a more effective upgrade in my view.
I parallel a 1000uf 25 v cap on the underside of the board. The 1000uf is an improvement over the 470uf.
I tried 0.1uf electro cap, 100nf polyester and 101 ceramic caps. The ceramic sound better.
The type of the bypass caps has a big impact in SQ.

You should experiment and post your findings here.

The blue "K" on the back of your board was my signature.
Krypton is one of three local contract Mfgs that TI uses for
that sort of board. You just got lucky...

Anyways, my own impression is that they do measure nice.
But I'm not ready to give up my Fisher or McIntosh over it.


I got amps I use in house to test controllers. And sometimes
a sleeping technician (not naming any names) will blow up
the occasional in house test amp. If I have to replace a chip
that's surrounded by through hole electrolytic caps, I will try
to have them moved to the back (like your mod) if possible.
Its easier to rework the chip if you aren't surrounded by tall
heat-vulnerable caps.

Last edited by kenpeter; 2nd December 2012 at 06:24 AM.
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Old 3rd December 2012, 12:53 AM   #130
kp93300 is offline kp93300  Malaysia
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Hi kenpeter
glad to know that the designer of the board is here in the forum!
Thanks for the fine amp . Such good value .
any suggestions on mods to take it to another level ?


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