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

[mbrennwa]

Ok, what about these:

MosFET: STP110N8F7
heatsink: Ohmite RA-T2X-64E

Let me know if they will (not) work / fit the board.

 

[xrk971]

That MOSFET will work. The heatsinks are not critical. Any little TO220 stamped aluminum one will work. It’s not a lot of dissipation.

 

[xrk971]

SLBs looking pretty good in Poseidonvoice’s NPXP (Nelson Pass Experimental Platform) amp:

Nelson Pass eXperimenter's Platform (NPXP)

The single rail SLB is now also prominent in Tungsten Audio’s linear external power supply for his Pass Sony VFET lottery amp:

DIY Sony VFET Builders thread

 

[angchuck]

Hi X

Do you have the bom or schematic for the single voltage circuit?

Thanks

 

[nautibuoy]

Posts #1 & #9

 

[xrk971]

Hi Folks,
I just ran out of stock on the dual rail SLB and placed another order for re-supply. It will take 10-12days before I get them in and ready to ship. So they are on back order in my shop.

Sorry for the inconvenience.

 

[wcwc]

X,

Is there any issue with using only the positive rail from the dual rail SLB? I have monoblocks each with their own Power Supply, but may want to switch from a dual rail +- 24V supply to the single rail 36V for the Sony VFet amp just by swapping transformers.

 

[xrk971]

I don’t think it’s a problem to use only half a side. They are rather independent. Just connect the transformer secondary to the positive side and do not connect the negative side.

 

[xrk971]

A new batch of SLB DR's just arrived - so if anyone has been waiting for them to come in, you can place your orders now. These are in white solder mask with ENIG. 2mm thock boards and 2oz cipper.

 

[lukrez]

Hi X, dear all,

Are those two too close to each other?

Thanks,
Martin

 

[Vunce]

@lukrez,

In actual use the aluminum heatsink is not needed, the transistors do not get hot. You could remove the HS for a bit more component space. Attach a small aluminum “finger” type heatsink on the transistors instead.
heatsink aluminium (25 PCs)for Transistor | eBay

 

[lukrez]

Thanks Vunce, I would only replace it if really necessary... I have more than enough aluminium HS in hand, which I ordered - so I would like to use them. 🙄

If the distance is an issue though... I would order something else.

Do you understand what I mean?

Cheers!

Edit: I now remember that I replaced C21 and C22 with some bigger parts, because the needed were out of stock - they don't fit 100% on the pcb... as shown on the photo above. Is the gap between the capacitor and the board ok?

Excuse my beginner questions. 😉

 

[xrk971]

The spacing between the heatsink and cap is fine as it doesn’t really get warm. A small stamped aluminum one that is super compact can work too if you build it in the future and need more space.

These would work fine:
50PCS black 15*10*20MM Triode Heat Sink 10*15*20MM TO 220 TO220 Transistor Aluminum Radiator Heat Sink Cooler Cooling 20*15*10MM|Electronics Stocks| - AliExpress

 

[Vunce]

....Edit: I now remember that I replaced C21 and C22 with some bigger parts, because the needed were out of stock - they don't fit 100% on the pcb... as shown on the photo above. Is the gap between the capacitor and the board ok?

Excuse my beginner questions. 😉

Yes, the small gap under the capacitors C21/22 is ok.

 

[lukrez]

Thank you both.

 

[tmas]

I am gathering parts for a USSA-5 build. I am planning on using the SLB power supplies in dual mono. I am considering the Antek AS-4222 transformers that are rated @ 22V. What would be my DC output from the SLB if I choose to use the transformers?

AS-4222 - 400VA 22V Transformer - AnTek Products Corp

 

[thompsontechs]

I can't find these, so what to use?

757-TTC5200Q
512-BD14016S----> Found this one
660-BPR58CR10J

 

[xrk971]

Try these, thousands available to ship immediately:

https://www.mouser.com/ProductDetai...2pyFadujThbhbpl74VDqcYpoEeHM5rb%2B4%2BhofY5M=

2SA1943N(S1,E,S) Toshiba | Mouser

You can probably use any 0.47R 3W axial and parallel them like a fence:

https://www.mouser.com/ProductDetail/Vishay-Dale/RW69VR47B12?qs=I1ZA2VTqfvTqw5sPd/UDfA==

simlar to two 0.1R in series

 

[thompsontechs]

Thanks X, think I have it under control...

JT

 

[jwjarch]

Update on my dual SLB build. Successfully running Zen Mod Babelfish J2 boards. Using Antek 4222, 400va with 22v secondaries. Getting 26.9v under load with the SLB pots fully turned for max dropout. 20v secondaries would get me to 24.4v but in a 5U deluxe chassis I have enough heat sink to make it work. I think the SLBs are doing their job really well. That said, I have a pretty major noise problem resulting in some toroid buzz that seems to be coming through to the speakers. I can hear it from my listening position when nothing is playing and during quiet passages. This is the case with all my amps which leads me to believe I have DC on the line and overall dirty power. Gathering parts for a DC trap and Fo-Felix boards now. Fingers crossed that finally quiets things down. The SLBs though, awesome.