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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)

xrk971 3rd July 2018 02:45 PM

If your name is on the list here, please PM me your PayPal address with quantity of board sets and country and I will send you an invoice.

Thanks,
X

Quote:

Badboygolf16v - 1 set, need PayPal address
Dabore84 - 2 sets, need PayPal address
funch - 1 set, need PayPal address
kartk - 1 set, need PayPal address
Yourownbuzz - 1 set, need PayPal address
BabyDontHertzMe - 1 set, need PayPal address
Stellarelephant - 1 set, need PayPal address
passive420 - 1 set, need PayPal address
Pinnocchio - 1 set, need PayPal address
vvs7 - 2 sets, need PayPal address
Gwrskien - 1 set, need PayPal address
Ernesternest - 1 set, need PayPal address
jwjarch - 1 set, need PayPal address
ermine22 - 2 sets, need PayPal address
Morde - 1 set, need PayPal address
S610adam - 2 sets, need PayPal address
pstech - 2 sets, need PayPal address
Silasmellor - 1 set, need PayPal address
ravid - 1 set, need PayPal address

xrk971 3rd July 2018 06:48 PM

1 Attachment(s)
Quote:

Originally Posted by jwjarch (https://www.diyaudio.com/forums/group-buys/323594-simple-performance-dc-coupled-class-hpa-sub-ppm-thd-post5479443.html#post5479443)
Wow! VERY nice JP and X! Can't wait to get my hands on this one. Any update on the status of the voltage regulator boards?

We looked into making our own TO220 style voltage regulator boards using Texas Intruments' TPS7A400 and TP7A3301 and it just isn't as cost effective as buying ready made ones from LDOVR.COM for $37 a set. These are nicely made units with genuine Murata X7R MLCC caps and are made in the UAE.

TPS7A4700-78XX Ultra Low Noise LDO Voltage Regulator

https://cdn3.volusion.com/pxwuc.sfka...jpg?1524562749

TPS7A3301 Ultra Low Noise LDO Voltage Regulator

https://cdn3.volusion.com/pxwuc.sfka...jpg?1524563761

They come with a 5 pin header to allow remote enable (EN) and remote feedback (FB), but to use as 3-pin 78xx/79xx package, cut the two end pins and solder the bridge pads to allow on board EN and FB. Also, what is nice is that in the meantime, you can just use the classic LM7818 and LM7918 (for less than $2) and it will also work quite well. On the positive regulator, several programming solder bridges need to be connected to set 18v. On the negative regulators, two SMT resistors need to be added to set the 18v output. We will provide you exact directions on how to do this.

This is an example of the regulator board mounted to a TO220 heatsink and used a a power supply module.

https://cdn3.volusion.com/pxwuc.sfka...jpg?1488335308

For our application, the two TO220 daughter boards from LDOVR.com would just mount in the middle of the PSU board, back-to-back with a shared heatsink - like this:
https://www.diyaudio.com/forums/atta...8&d=1530643945

xrk971 4th July 2018 08:35 PM

GB Status Update....

Quote:

*Badboygolf16v - 2 sets, Invoice sent
*Dabore84 - 2 sets, Invoice sent
*funch - 1 set, Invoice sent
kartk - 1 set, need PayPal address
Yourownbuzz - 1 set, need PayPal address
BabyDontHertzMe - 1 set, need PayPal address
Stellarelephant - 1 set, need PayPal address
*passive420 - 1 set, Invoice sent
Pinnocchio - 1 set, need PayPal address
vvs7 - 2 sets, need PayPal address
Gwrskien - 1 set, need PayPal address
*Ernesternest - 1 set, Invoice sent
*jwjarch - 2 sets, Invoice sent
*ermine22 - 3 sets, Invoice sent
*Morde - 1 set, Invoice sent
S610adam - 2 sets, need PayPal address
pstech - 2 sets, need PayPal address
Silasmellor - 1 set, need PayPal address
*ravid - 1 set, Invoice sent
* indicates new activity. Thanks to all who sent me their PP address!
-X

Malvin 4th July 2018 11:51 PM

is it too late to join? I'd like 1 set

xrk971 5th July 2018 03:46 AM

Not too late at all.

Quote:

*Badboygolf16v - 2 sets, Invoice sent
*Dabore84 - 2 sets, Invoice sent
*funch - 1 set, Invoice sent
kartk - 1 set, need PayPal address
Yourownbuzz - 1 set, need PayPal address
BabyDontHertzMe - 1 set, need PayPal address
Stellarelephant - 1 set, need PayPal address
*passive420 - 1 set, Invoice sent
Pinnocchio - 1 set, need PayPal address
vvs7 - 2 sets, need PayPal address
Gwrskien - 1 set, need PayPal address
*Ernesternest - 1 set, Invoice sent
*jwjarch - 2 sets, Invoice sent
*ermine22 - 3 sets, Invoice sent
*Morde - 1 set, Invoice sent
S610adam - 2 sets, need PayPal address
pstech - 2 sets, need PayPal address
Silasmellor - 1 set, need PayPal address
*ravid - 1 set, Invoice sent
Malvin 1 set, need PayPal address

xrk971 5th July 2018 10:35 AM

GB Status Update

Quote:

*Badboygolf16v - 2 sets, Paid
Dabore84 - 2 sets, Invoice sent
*funch - 1 set, Paid
kartk - 1 set, need PayPal address
*Yourownbuzz - 1 set plus Aksa Lender Pre TH and 2SA1837's, Invoice sent
BabyDontHertzMe - 1 set, need PayPal address
*Stellarelephant - 1 set, Paid
passive420 - 1 set, Invoice sent
*Pinnocchio - 1 set, Invoice sent
*vvs7 - 2 sets, Paid
Gwrskien - 1 set, need PayPal address
Ernesternest - 1 set, Invoice sent
*jwjarch - 2 sets, Paid
*ermine22 - 3 sets, Paid
*Morde - 1 set, Paid
S610adam - 2 sets, need PayPal address
pstech - 2 sets, need PayPal address
*Silasmellor - 1 set, Invoice sent
*ravid - 1 set, Paid
*Malvin 1 set, Invoice sent
Thanks to those who have already paid, I will be ordering the boards soon after one more careful examination of the schematics and Gerbers for any errors or problems.

For the folks in bold above, please send me your PP address to indicate continued interest in the GB.

Thanks,
X

Morde 5th July 2018 10:50 AM

1 Attachment(s)
I have a question about the CLC board. According to the attached diagram there is no CLC board presented, but should one still use it?

xrk971 5th July 2018 01:03 PM

I think JPS64 (please confirm) made the additional CLC for those wishing to use their own dual rail PSU or for those with extremely dirty mains - as the PSU has a CLC built in, it is mainly to prevent the switching noise from going back and contaminating the mains. Whereas the separate one is for protecting the amp from the noise in the mains.

passive420 5th July 2018 01:13 PM

Invoice paid X, many thanks to you and JP for the excellent project development

JPS64 5th July 2018 01:44 PM

Hi X,

confirmed: for dirty wall switching supplies.

JP


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