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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 12th June 2018, 08:32 AM   #21
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
We are looking at using the Traco THN 15-1225 to provide +/-24v rails from any typical DC input. It's pricey at $41 but avoids mains. We then follow with Texas Instr. TPS7A4701RGWT for a 4uV noise LDO regulator on positive rail, and TPS7A3301RGWT LDO for negative rail. Also will use a Wurth Electric common mode choke to clean it all up. About $60 total in parts for PSU but it is a state of the art integrated solution that is very clean and safe.

THN 15-1225 TRACO Power | Mouser
TPS7A4701RGWT Texas Instruments | Mouser
TPS7A3301RGWT Texas Instruments | Mouser
74482210002 Wurth Electronics | Mouser

Let us know what you guys think - is the integrated PSU too expensive and you would all rather make your own trafo/CRC/VR's?

JPS64 was playing around with metal core PCBs that bolt onto some Fischer heatsinks - but just as easy to bolt them to the bottom or side walls of an aluminum enclosure. You can see how small the PSU DC-DC converter and LDO's are.
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File Type: png Amp-PSU-Concept.png (174.3 KB, 216 views)
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Last edited by xrk971; 12th June 2018 at 08:37 AM.
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Old 12th June 2018, 09:15 AM   #22
dabore84 is offline dabore84  Netherlands
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
I think is nice change from the usual suspects. So I'm in with integrated psu
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Old 12th June 2018, 10:26 AM   #23
yourownbuzz is offline yourownbuzz
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Hmm sounds good - I'm probably still in for the board but due to the psu components cost might not be something I build right away though...or may just use a lab supply in the meantime

Not sure what the final design of the pcb would be like but maybe you could make it one pcb with the option to snap off the psu section for people who don't want it? Just a thought

Last edited by yourownbuzz; 12th June 2018 at 10:29 AM.
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Old 12th June 2018, 11:37 AM   #24
passive420 is offline passive420  United Kingdom
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Looks a nice cute design, DC PSU module is good, I have a 30VDC printer supply here that would be perfect.

Please put me down for one stereo set of boards.
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Old 12th June 2018, 02:46 PM   #25
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Here is sort of where JPS64 is going now for the layout, with a snap-off PSU section. What do you guys think? The underhung MOSFETs can also go up with local heatsinks.
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File Type: png FR4_complete_V1_bot_2.png (326.9 KB, 198 views)
File Type: png FR4_complete_V1_top_2.png (226.5 KB, 195 views)
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Old 12th June 2018, 04:24 PM   #26
pinnocchio is offline pinnocchio  Canada
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Looks nice!

It would be cool to add in a xfeed circuit that can be switched on and off option while your designing the PCB?

Do
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Old 12th June 2018, 04:49 PM   #27
sarathssca is offline sarathssca  India
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how about power supply given in http://www.linearsystems.com/lsdata/...tion_Board.pdf
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Old 12th June 2018, 05:11 PM   #28
vvs07 is offline vvs07  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
I'm in for 2 boards.
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Old 12th June 2018, 07:18 PM   #29
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
So here is some more progress... We are thinking of also adding a cap multiplier to give a graceful slow ramp turn on to prevent headphone thump and also to prevent the DC-DC from auto-shutdown due to cap in-rush current.
Attached Images
File Type: png Simple-HPA-Integrated-3d-top.png (656.4 KB, 176 views)
File Type: png Simple-HPA-Integrated-3d-top-backside.png (593.1 KB, 168 views)
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Old 12th June 2018, 07:21 PM   #30
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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
passive420 - 1 pair
Pinnocchio - 1 pair
vvs7 - 1 pair
sarathssca - 1 pair
By pair, it is meant a stereo integrated board. If you want qnty 2 of a stereo board, please indicated such.

I am assuming folks who responded with questions above are "interested" if not, please remove your name and sorry for assuming too much.
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