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-   -   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 25th February 2020 12:50 AM

No, the resistors on SLB don’t have to be modified for 20V operation, but I defer to Hugh or Jhofland.

AKSA 25th February 2020 02:10 AM

Absolutely correct, Andy.
Thanks X.

HD

andyr 25th February 2020 04:08 AM

Thanks, X & Hugh. :)

Andy

andyr 25th February 2020 04:48 AM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/336479-slb-smooth-butter-active-rect-crc-cap-mx-class-power-supply-gb-post6048830.html#post6048830)
Yes, thatís correct. You can also tell by the pads: square is pin 1(Base).
https://www.diyaudio.com/forums/atta...b-top-view-png

Hi X,

Sorry - a couple of Qus:

You said "square is pin 1 - the Base ".

Yes, pin 1 is the base for the transistors used at:
* Q10 (2SA1943), and
* Q12 (2SC5200).

However, the pin layout for Q9 (BD139) and Q11 (BD140) have the Emitter as pin 1.

So, Qu 1: does that mean the square pad on the PCB, for these transistors, is:
* pin 1 (which is the Emitter)
* or the square pad is for the Base - as this is the convention jhovland always uses?

Qu 2: I don't know how I did this but for Q10 & Q12, I ordered:
* TTA1943Q & TTC5200Q
* instead of 2SA1943 & 2SC5200.

Are the ones I ordered OK ... or do I need to get 2SA1943 & 2SC5200?

Thanks,
Andy

xrk971 25th February 2020 10:39 AM

This is always true on SLB: square pad is pin 1. Pin 1 is left pin when viewed legs down and label/marks visible.

Not all PCBs have a square pad on pin 1 or square pad at all.

The BJTs you got are good. It’s a newer package in TO-247 I think.

andyr 25th February 2020 08:47 PM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/336479-slb-smooth-butter-active-rect-crc-cap-mx-class-power-supply-gb-post6097702.html#post6097702)

This is always true on SLB: square pad is pin 1.

Great - thanks, X.

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/336479-slb-smooth-butter-active-rect-crc-cap-mx-class-power-supply-gb-post6097702.html#post6097702)

The BJTs you got are good. Itís a newer package in TO-247 I think.

Whew! Thanks. :)

Andy

Jaytor 26th February 2020 03:46 AM

I apologize if this has been answered already - I've read most of the posts, but not all. I know this PS was designed to be used with class A amps, but does the design require a certain amount of constant current draw to work effectively?

I ordered a pair of dual-rail boards and would like to use them with a class A/B chip amp initially, but perhaps a class A amp down the road. If the chip amp current requirements are under 5A, is there any reason why this PS wouldn't work effectively?

xrk971 26th February 2020 05:22 AM

It will work at lower current draw just fine.

xrk971 27th February 2020 05:27 PM

I just placed another order for more SLB's as my current inventory has now sold out. So please be patient if you just ordered some. Manufacturing is now 10 days due to Covid19. It used to be 5 days.

Thanks for all the interest in this PSU design!

thompsontechs 27th February 2020 06:33 PM

Sold out
 
3 Attachment(s)
Yup, just got these yesterday and went to work today....


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