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-   -   Simple High Performance DC Coupled Class A HPA with sub PPM THD (https://www.diyaudio.com/forums/group-buys/323594-simple-performance-dc-coupled-class-hpa-sub-ppm-thd.html)

yourownbuzz 11th June 2018 06:40 AM

Does this need dual rail power? Looks like it does..

kartk 11th June 2018 10:07 AM

I'll also take a pair, please count me in.

dabore84 11th June 2018 10:50 AM

Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair

Please continue with this list.

xrk971 11th June 2018 02:17 PM

JPS64 and I are working on an integrated compact dual rail supply on same stereo board to make this project a lot more user friendly. We are thinking maybe simple Class 2 wall wart trafo to power a nice DC-DC dual rail step up, followed by state of the art TI ultra low noise LDO linear regulators and then some additional filtering.

A standard linear trafo and CRC and 7815/7915 works but FFT floor is not flat battery quiet like the way I like to see it. Inaudible of course but bothers me that it’s not like a battery.

xrk971 11th June 2018 02:21 PM

Quote:

Originally Posted by yourownbuzz (https://www.diyaudio.com/forums/group-buys/323594-simple-performance-dc-coupled-class-hpa-sub-ppm-thd-post5458926.html#post5458926)
Does this need dual rail power? Looks like it does..

Yes, but we are re-spinning PCB to have integrated SOA dual rail supply from single rail 5.5mm barrel jack input from say, a laptop brick etc.

xrk971 12th June 2018 03:41 AM

GB interest list for TimS Simple HPA:

I am assuming BDHM and YOB are also interested then?

Quote:

Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Although the board may be getting respun as integrated stereo with built in PSU do not sure if “pair” is correct term.

stellarelephant 12th June 2018 04:30 AM

One for me, please :)

yourownbuzz 12th June 2018 06:00 AM

hey X thanks for the mention! if it requires dual rails I may be out - not really confident with mains AC/transformers. Actually this is what is holding me back from building speaker amps.

but if you do manage to get it running off a wall wart with DC step up and splitter etc I'd be up for it!
This also looks pretty cool too - would you be making up any HPA boards? (however would also be waiting on a wall wart/DC step up solution for the dual rails)
http://www.diyaudio.com/forums/attac...9-build-01-jpg

xrk971 12th June 2018 07:12 AM

Quote:

but if you do manage to get it running off a wall wart with DC step up and splitter etc I'd be up for it!
That's the plan - JP and I are designing it as we speak and I am ordering parts to proto on breadboard before we commit to ordering full blown integrated PCBs with PSU's.

GB interest list:
Quote:

Badboygolf16v - 1 pair
Dabore84 - 1 pair
funch - 1 pair
kartk - 1 pair
Yourownbuzz - 1 pair
BabyDontHertzMe - 1 pair
Stellarelephant - 1 pair

yourownbuzz 12th June 2018 08:23 AM

Ah ok gotcha. Thought it was a gb for the boards as rendered in the first post.

Would it be worth waiting for this one before ordering the aksa preamp boards to save on postage?


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