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

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Kokanee

Kokanee

Member
Joined 2010
Paid Member
Hello X and other builders. I am having a brain teaser with the dual rail SLB. Not with the actual schematics or layout, but with these 2 little helper boards I have purchased.

I would like to use a 4 pin molex box adapter with these blue helper boards.

Could some one tell me what the numeral 1 on the blue boards signifies ?

Am I correct in thinking that the molex box on the blue boards should be C-C-E-B starting from the upper left corner of the box proceeding clockwise ?.

I am also attaching a pic of the bottom of each of the blue heiper boards to hopefully explain my thinking about the molex pins.

Thanks a lot for the help.
MM

HB1.jpg HB2.jpg
 
Kokanee

Kokanee

Member
Joined 2010
Paid Member
Thanks IAIMH,

So for the N-BJT board using BCE: In the molex box 1 is B. Proceeding CW from 1 it is E, E, C

So for the P-BJT board using BCE: In the molex box 1 is B. Proceeding CW from 1 it is C, C, E

I don't know why the difference, but will be aware when running wires from the molex box to the SLB.

Thanks for the hint.
MM
 
B

Blowmymind

Member
Joined 2019
Hey everyone,
Read that for the newer version of the SLB dual rail I need to order vertical moles connectors J5 and j6. Mini fit plus hcs46015. Are these the correct ones? Also, I’m using the mouser BOM. Is the cart already doubled for the dual rail? The BOM pdf doesn’t seem to match the board. I’m just a little confused!🙂
 
A

Antealta

Member
Joined 2020
xrk971 said:
It could work, I personally would use 300VA but if you have them already, why not. The way to calculate this is to start with the no load voltage and start subtracting drops and losses.

22v is 31v no load. For a 200va trafo running about 2A I would guess about 5v sag. Another 3v drop across SLb is 8v total. 31v -8v = 23v. Should be ok.
Click to expand...
or will this apply ? So i will get ~36v under load
160va trafo
amp ~ 1,7amp draw
 
xrk971

xrk971

Founder of XSA-Labs
Joined 2012
etsy.com/shop/XRKAudio
Paid Member
Antealta said:
Hi

i am getting 43v under no load, ned to get it down to 36v to use it with my vfet (i have no idea what i'm doing😀👍)
i have asked TungstendAudio, but didn't answer back View attachment 1313863
Click to expand...
You will get no more than 3-5v drop in SLB. Maybe 2-5v drop from current sag under a class A load. Thats 5-10v depending on circumstances. Run higher bias current to drop it more?

Use high current diodes in series as voltage droppers. 10x0.6v is 6v drop.
 
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