The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB

[tubesguy]

The big Aavids look nice though - if you really want those - get them.

Will probably be the best-looking part of my build.

 

[xrk971]

GB Status Update:

baswamin - 2 boards - Paid
meanie - 2 boards - Paid
jwjarch - 2 boards - Paid
gary s - 2 boards - Paid
nautibuoy - 2 SLB boards - 2 SLB-SR boards - both Paid, ship together
antoniopf1972 - 2 boards - Paid
ravid - 2 boards - Paid, Simple PSU Paid, ship at same time
Gricko - 2 boards - Paid
poseidonsvoice - 2 boards - Paid
Bkdog - 2 boards - Paid
Jazzfan - 4 boards - Paid
yoaudio - 2 boards - Paid
*van of monks - 1 board - *Invoice sent*
Wtl - 4 boards - Paid
cerole - 2 boards - Paid
s610adam - 4 SLB - 6 SLB-SR - Paid
pbergstrom - 2 boards - *need PayPal address*
ferret - 2 boards - Paid
Roundtoit - 2 SLB boards, 2 SLB-SR boards - Paid
Tubesguy - 1 SLB board - Paid
Kokanee - 8 boards - Paid
Arthur - 10 boards - Paid
potepuh - 2 SLB boards - Paid
TboneAK - 2 SLB Boards - Paid
Sanjeevm - 2 SLB Boards - Invoice sent
Centurion53 - 2 SLB boards - Invoice sent
Vunce - 2 SLB boards, 2 SLB-SR boards - Invoice sent
Ermine22 - 4 SLB boards - Need to know if want exchange for lost previous GB

 

[ferret]

Hi X,
Do you have a part number for the NTC 8D-20 at Mouser? The best match I can find here is only a 3A (max) rated one. I will just have to add this to my Mouser order.
Regards, Kevin

P.S. BTW, is this essential, for the PSU?
P.P.S. Just found a 10R 6A thermistor, that should be fine not so?

 

[xrk971]

Yes, that is fine. Or CL-60 which is what many people use.

 

[AKSA]

This is proving very popular! Never thought so many people were interested in Class A in these green days of conserving energy!
Kudos to XRK, Jan and Vunce for driving this so well.......
HD

 

[xrk971]

Yes, we have lots of interest and I think it is because it is a very general and useful tool to have in one's Class A toolbox. I have implemented the single board dual rail SLB in a typical 25w Class A amp (the M2X) and using a 300VA 32v Antek, am able to get +/-25.4Vdc rails (a tad over 24v nominal spec but that's actually good as you get a bit more headroom. Will take some measurements soon but so far, all is quiet and no sign of hum.

GB Status Update:

baswamin - 2 boards - Paid
meanie - 2 boards - Paid
jwjarch - 2 boards - Paid
gary s - 2 boards - Paid
nautibuoy - 2 SLB boards - 2 SLB-SR boards - both Paid, ship together
antoniopf1972 - 2 boards - Paid
ravid - 2 boards - Paid, Simple PSU Paid, ship at same time
Gricko - 2 boards - Paid
poseidonsvoice - 2 boards - Paid
Bkdog - 2 boards - Paid
Jazzfan - 4 boards - Paid
yoaudio - 2 boards - Paid
*van of monks - 1 board - *Invoice sent*
Wtl - 4 boards - Paid
cerole - 2 boards - Paid
s610adam - 4 SLB - 6 SLB-SR - Paid
pbergstrom - 2 boards - *need PayPal address*
ferret - 2 boards - Paid
Roundtoit - 2 SLB boards, 2 SLB-SR boards - Paid
Tubesguy - 1 SLB board - Paid
Kokanee - 8 boards - Paid
Arthur - 10 boards - Paid
potepuh - 2 SLB boards - Paid
TboneAK - 2 SLB Boards - Paid
Sanjeevm - 2 SLB Boards - Paid
Centurion53 - 1 SLB boards - Invoice sent
Vunce - 2 SLB boards, 2 SLB-SR boards - Paid
Ermine22 - 4 SLB boards - Need to know if want exchange for lost previous GB

 

[Mark Johnson]

... using a 300VA 32v Antek, am able to get +/-25.4Vdc rails ...

Is that a typo? a 2x32VAC secondary transformer would provide about +/- 42Vdc , and a 2 x 16VAC secondary transformer would provide about +/- 21Vdc. In neither case is it 25 ... ???

Maybe it was a 2 x 22Vac Antek?

 

[xrk971]

Sorry, typo AN-3222. The 3232 is what I use to get 35v from an SLB under load.

 

[xrk971]

GB Status Update.... boards have been ordered and are at silkscreen step, maybe another day and they should be finished before shipping.

baswamin - 2 boards - Paid
meanie - 2 boards - Paid
jwjarch - 2 boards - Paid
gary s - 2 boards - Paid
nautibuoy - 2 SLB boards - 2 SLB-SR boards - both Paid, ship together
antoniopf1972 - 2 boards - Paid
ravid - 2 boards - Paid, Simple PSU Paid, ship at same time
Gricko - 2 boards - Paid
poseidonsvoice - 2 boards - Paid
Bkdog - 2 boards - Paid
Jazzfan - 4 boards - Paid
yoaudio - 2 boards - Paid
van of monks - 1 board - Paid
Wtl - 4 boards - Paid
cerole - 2 boards - Paid
s610adam - 4 SLB - 6 SLB-SR - Paid
pbergstrom - 2 boards - Paid
ferret - 2 boards - Paid
Roundtoit - 2 SLB boards, 2 SLB-SR boards - Paid
Tubesguy - 1 SLB board - Paid
Kokanee - 8 boards - Paid
Arthur - 10 boards - Paid
potepuh - 2 SLB boards - Paid
TboneAK - 2 SLB Boards - Paid
Sanjeevm - 2 SLB Boards - Paid
Centurion53 - 1 SLB board - Paid
Vunce - 2 SLB boards, 2 SLB-SR boards - Paid
*Ermine22 - 4 SLB boards - Need to know if want exchange for lost previous GB

Everyone is all paid up - thank you! Just need info from Ermine22 what he wants to do about using credit he has on previous GB.

 

[gary s]

Thanks for the update X.

 

[meanie]

For M2X application, can a 25+25vac secondary be use for SLB ?

 

[xrk971]

That is a little high and you will be around +/- 28 to 29v. It will play music but heat output just went up quite a bit.

 

[ferret]

Going green

Hi Aksa,

I conserve energy on everything except my Class A amp/s. With Quad ESLs anything else doesn't cut it. I've ordered all the components for this build; now just to wait for the boards.

Kevin

 

[xrk971]

The boards are just about completed at the board fab house. Probably another 5 days before I get them. Really looking forward to using them in my projects. The Alpha BB is one where I see huge benefits. I currently run two CRCs in series for that amp and the diodes are making lots of heat.

 

[poseidonsvoice]

XRK,

Are you planning on stocking them in the future ? I see these boards selling even after this group buy is done.

Best,
Anand.

 

[xrk971]

Yes, once I send out the GB and take care of the few late comers and stragglers on this thread, they will go to my shop so that the logistics are much easier to handle.

 

[Shawnstium]

Hello all. I would like to order a dual supply SLB v2 also.

Thank you!

 

[ferret]

Hi X,

I have a Moth 30 RIAA amplifier I want to rebuild at some point. Would a slightly scaled down version of this project be good enough to power it, viz. with 6800uF or max. 10 000uF caps? It draws a maximum of 1 A @ +24 V & -24 V. The other option of course is to power it with 4 12V SLA batteries.

Kevin

 

[xrk971]

Sure, 1A at +/-24 is no chump change. That’s almost as much as one channel of a Pass Class A 25w amp which typically draws 1.25A. 48W dissipation in the amp output stage is quite a lot. You could use 6800uF of course but 15000uF caps are not expensive and might as well get 50v ones so the PSU is good for higher voltages on the future.

 

[Shawnstium]

Will the front face plate of the Deluxe 4U Aluminum provided enough cooling for the power transistors?

Has anyone used a cap Mx with the Pass F4?