Xmas Amp - Dibya's TDA7293 by Jhofland

[Francois G]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
Hiten / 2 boards / India
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA

 

[asuslover]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
Hiten / 2 boards / India
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA

 

[Hiten]

Gentlemen please use following list as said in earlier post. Merry christmas everyone.


MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA

 

[Guerilla]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark

 

[astromo]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia

(13 pairs so far)


thanks and merry christmas

 

[Kay Pirinha]

I'm also interested in a pair of these wonderful boards. Thanks to the developers and all other persons involved!


MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany


Physical postage addresses will be exchanged by PM, I guess?


Merry Xmas to anyone out there!

 

[xrk971]

If the moderators approve, the easiest way for me to implement the free board giveaway would be to list it on my shop as an item for $0.20 (minimum price allowed) and with typical auto calculated shipping which comes out to about what I said earlier. The logistics are much simplified this way.

The alternative is to collect names and addresses via PM and have you PayPal me funds.

 

[Francois G]

X, thanks and Happy Holidays!

With moderator approval I think you should do what is most convenient to you. If listed on your Etsy shop can you restrict buyers to people on “the list”?

 

[pinkfloyd4ever]

Hmmm this is very interesting. I built a Mauro Penesa-designed LM3886 (MyRef Rev_C) 10 years or so ago and it’s still my everyday amp. It would be interesting to compare to this...and most importantly, I can afford to build it haha.

So it looks like once you populate the PCB (1 per channel) you just need to add a transformer, 15,000-20,000 uF capacitance, and chassis, correct? Any advantage to a dual mono design with separate transformers and cap bank per channel?

What are the heatsinking requirements?

Whether or not I do decide to get a set of PCBs, big thanks to Dibya, Jhofland, and xrk971 for doing this!

 

[pinkfloyd4ever]

Ah who am I kidding? Heck yes I’ll take a pair of boards.

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA

Thanks again to Dibya, Jhofland, and xrk971!

 

[Sixto]

I'm in,

Ok, edited message to include last posted name...

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA

ah, the risks of two people responding to the ame message, sorry Pink! Copied your name back in.

 

[tubesguy]

If Donald is in, I better be also. Thanks, X.

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
tubesguy/2 boards/USA

 

[Vunce]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA
Tubesguy / 2 boards / USA

 

[e_fortier]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA
Tubesguy / 2 boards / USA
E_Fortier / 2 boards / Canada

Thanks a lot X and the designer group!

 

[tubesguy]

Ok, edited message to include last posted name...

ah, the risks of two people responding to the ame message, sorry Pink! Copied your name back in.

Ach, then I did it too! Luckily, Vunce fixed my mistake.

 

[Hicoco]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA
Tubesguy / 2 boards / USA
E_Fortier / 2 boards / Canada
Hicoco / 2 boards / France




Thanks and Happy Holidays

 

[e_fortier]

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA
Tubesguy / 2 boards / USA
E_Fortier / 2 boards / Canada
Hicoco / 2 boards / France
Liva / 2 boards / Canada

 

[xrk971]

Glad to see all the interest. My one hope is that if you get the free boards, please build it - as there are others who could have used it. It’s an easy project.

Happy holidays and have fun!

 

[xrk971]

So it looks like once you populate the PCB (1 per channel) you just need to add a transformer, 15,000-20,000 uF capacitance, and chassis, correct? Any advantage to a dual mono design with separate transformers and cap bank per channel?

What are the heatsinking requirements?

Dual trafos and dual monoblocks have better stereo imaging and less prone to ground loop hum. This is oversized at 200VA but would make a nice trafo:

AS-2225 - 200VA 25V Transformer - AnTek Products Corp

If going single trafo stereo, this one should work well:

AS-3225 - 300VA 25V Transformer - AnTek Products Corp

I have found this heatsink to be more than adequate for 38w class Chipamps:

Awxlumv Aluminum Heatsink 60 x150 x 25 mm / 2.36x 5.91x 0.98 Inch Radiator for Circuit Board PCB Heat Sinks Led Cooling Cooler Amplifier Transistor Semiconductor Devices with 24 pcs Fins - Sliver https://www.amazon.com/dp/B07VDHQDQT/ref=cm_sw_r_cp_api_glc_fabc_A225FbNCEX39H

So $41 for the trafo (plus $15 shipping from Antek) and $20 for the two heatsinks and you have most of your amp. You can use any number of basic bridge and cap PSU. Or make one as P2P. It’s easy.

I have seen better ones but this should suffice for a PSU:
ZG Amplifier PSU kit with 4 X10000uFNover LA Audio Grade Capacitor/Power supply | eBay

 

[Kokanee]

I would like a pair also.

MaxReboBand / 2 boards / USA
as8912 / 2 boards / USA
ahtllc / 2 boards / USA
dBel84 / 2 boards / USA
Flamethrower1 /2 boards/ USA
Signal Lost / 2 boards / USA
diy.tiger / 2 boards / NZ
MShipmanPE/ 2 boards / USA
Angchuck / 2 boards / Singapore
Francois G / 2 boards / USA
Asuslover /2 boards /USA
Guerilla / 2 boards /Denmark
astromo / 2 boards / Australia
Kay Pirinha / 2 boards / Germany
pinkfloyd4ever/ 2 boards / USA
Sixto / 2 boards / USA
Tubesguy / 2 boards / USA
E_Fortier / 2 boards / Canada
Hicoco / 2 boards / France
Liva / 2 boards / Canada
Kokanee / 2 boards / Canada

Thank you to the design team
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