diyAudio

diyAudio (https://www.diyaudio.com/forums/index.php)
-   Group Buys (https://www.diyaudio.com/forums/group-buys/)
-   -   The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB (https://www.diyaudio.com/forums/group-buys/336479-slb-smooth-butter-active-rect-crc-cap-mx-class-power-supply-gb.html)

xrk971 17th May 2019 06:41 PM

The voltage drop is typically 3v through the pass (slave) transistor on the CFP. All 25w Nelson Pass Class A amps are designed around 1.25A quiescent bias current and +/-24v rails. The dissipation in the pass transistors is then 3v x 1.25A per rail per channel or 3.75w per rail per channel. x 2 rails x 2 channels is 4x3.75w total =15w. I think the front aluminum faceplate can easily dissipate 15w (or 7.5w ea).

Or get a small heatsink like this one (150mm x 60mm x 25mm) for $4 - it works fine:
https://www.diyaudio.com/forums/atta...o-build-01-jpg

Aluminum Heatsink Cooling Fin 150mmx60mmx25mm for Power Amplifier A6P7 190268295864 | eBay

I am using with an M2 right now (same category of 25w Class A Nelson Pass amp), and it works well to provide the current needed.

Shawnstium 17th May 2019 07:00 PM

1 Attachment(s)
Great! I am excited to build it and try it out. I tired out a cap Mx using the extra MOSFETs I had from the build but the heat sinks got to 49C really quickly.

xrk971 17th May 2019 07:19 PM

49C is not too hot for heatsinks. Normal operating temp for typical Class A heatsinks are 50C to 55C.

xrk971 17th May 2019 07:23 PM

GB Status update...

I am asking for your help here to update the list if I forgot to add you here. I get a lot of requests via PM for a GB, and the way it should work is to start at the list and then a PM, rather than other way around. I can't easily keep track of it from the PM back to the list.

Here is what I have so far, and I know some are missing here:

Quote:

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
Shawnstium - 1 SLB - Paid
*Ermine22 - 4 SLB boards - Need to know if want exchange for lost previous GB

ferret 17th May 2019 10:30 PM

1 more board please
 
Hi X,

Please add one more board. For my Moth 30 project. Will do PayPal pmt in a moment.

Kevin
P.S. Please send me an inv to my PP account. Can't seem to make another payment from the previous one.

gary s 17th May 2019 11:05 PM

Hi X, is the Alpha BB you referred to, the Alpha 20?

I have those boards from you and that is planned with the SLB here as my ultimate power amp. I will then mate it to the Yarra as the front end.

ferret 17th May 2019 11:19 PM

Hi X, not to worry found your details and made the payment. Last question - can the LT4320 be used with a DIP connector, or is it better to solder it in directly?

Shawnstium 18th May 2019 12:23 AM

Dip sockets are usually only a problem with high speed op-amps at high frequencies, so 50/60 hz shouldn’t be an issue. They can add a small amount of the capacitance between the PCB and the leads.

xrk971 18th May 2019 01:34 AM

Thanks for the payment Ferret, I have you down for 3 boards then. You can skip the sockets if you like. It's not like we need to swap out the LT4320's.

Quote:

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 - *3 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
Shawnstium - 1 SLB - Paid
*Ermine22 - 4 SLB boards - Need to know if want exchange for lost previous GB

gary s 18th May 2019 05:24 AM

xrk971, in thread #194 you mention the 'AlphaBB' - is this the same as the Alpha 20 which I have PCB's here from your store ready to build. I plan to use the SLB for this amp for my next ultimate power amp build, before doing an ultra extreme high end build on the Yarra preamp.

Regards,

Gary..


All times are GMT. The time now is 04:52 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio

Wiki