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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
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Old 30th June 2020, 01:04 AM   #961
xrk971 is offline xrk971  United States
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
Sorry you are having a hard time soldering this board. It’s beefy and stout that’s for sure. If we designed it for robot assembly it would be all SMT to the extent possible. That’s basically everything except the bulk caps, Molex and Fastons. The BOM would be $40 less. My 60w iron solders it fine. Those are not just ground planes but large high current traces as this is designed to run continuous 5A loads.
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Last edited by xrk971; 30th June 2020 at 01:07 AM.
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Old 30th June 2020, 03:18 AM   #962
Vunce is offline Vunce  United States
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
Quote:
Originally Posted by grataku View Post
Of course you can bend-push and shove but it's just not the way to design a board. Also the overuse of ground planes is extremely painful to deal with. The soldering loops around caps and resistors couldn't be made any smaller either!
I had to whip out my 80W big daddy soldering iron to flow the 4 filter caps. Overall I am much less impressed with the board now after spending the day working with it. It seems to be designed for machine stuffing and soldering.
Hmm.....
This is quite an interesting opinion about the SLB psu??
Iíve built approximately 12 of these plus 4 of the single rail versions and donít see it this way at all. Itís a board that requires patience, learned skills and passion of DIY to assemble. Iíve never had to bend, force or shove any components on this board. The 8 GND faston tabs are extremely helpful to have when using a single SLB For a stereo amplifier. And, if you donít need them all, simply donít populate them all. I really donít get the ďdesigned for machine stuffing and solderingĒ comment?? This board is the complete opposite of that.
Take some time and carefully assemble this board, you will be rewarded with supreme performance
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Old 30th June 2020, 06:58 PM   #963
grataku is offline grataku  United States
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Quote:
Originally Posted by Vunce View Post
Hmm.....
This is quite an interesting opinion about the SLB psu??
Iíve built approximately 12 of these plus 4 of the single rail versions and donít see it this way at all. Itís a board that requires patience, learned skills and passion of DIY to assemble. Iíve never had to bend, force or shove any components on this board. The 8 GND faston tabs are extremely helpful to have when using a single SLB For a stereo amplifier. And, if you donít need them all, simply donít populate them all. I really donít get the ďdesigned for machine stuffing and solderingĒ comment?? This board is the complete opposite of that.
Take some time and carefully assemble this board, you will be rewarded with supreme performance
Ok, the circuit design is interesting, the mosfet-controller rectifier is very helpful to control dissipation issue but the practical implementation of the circuit leaves a lot to be desired. It's just my opinion. I have never needed anything higher than 30W for soldering PCBs but hey, I have been out of this game for 14 years so my passion for DIY may have dropped a few notches.
I want quick and easy and onto listening. ;-)
The comment about 'passion for DIY'
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Old 30th June 2020, 07:16 PM   #964
thompsontechs is offline thompsontechs  United States
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
I understand what you are saying as I brought up how hard it was to flow in certain areas, usually on the ground side. I too was not real happy and made it known as well. The problem is it wicks the heat sway before it ever gets hot enough for the solder to stick... you get a gob on the lead, put nothing on the pad. After that, I put on a larger tip and dialed up the Sealody to 450 dropped the blade tip on the pad for a couple seconds then adding solder and got good adhesion.



I don't get the push pull, but I understand your issues with heating the pads (It's really in 4-5 areas, the rest you don't need that kind of heat. (Maybe 5-6 component positions) This actually changed the way I solder going forward, I use a SMD Blade. goes to a fine point, but is super wide if needed. I found I can use it like a scalpel or a hammer. I also run my iron HOT get on and get off 400F baby. lol


I have built at least 10-12 of them since that first one... there is a curve there, but I think the heavy duty nature and clean power are worth a bit of frustration as you learn the board.
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Last edited by thompsontechs; 30th June 2020 at 07:18 PM.
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Old 30th June 2020, 08:03 PM   #965
jameshillj is offline jameshillj  Australia
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I too find the board design to be rather unfriendly to the average diy guy - the small clearance between the very small component donuts and copper pour are troublesome and awkward for component changes and pulling any of the capacitors, power resistors, etc isn't at all easy either as there are no relief donuts on the slabs of copper, and the extensive vias doesn't help either, as has been mentioned above - it's what you would call a "closed design" and no changes are expected.

As the 'sound' of the supply is quite dependent on the capacitors, etc, changing any of them is a real PIA for an inveterate 'fiddler' like me

Can't fault the engineering and the numbers are impressive and it works quite well ... perhaps the next version will adopt some changes
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Old Yesterday, 12:50 PM   #966
stretchneck is online now stretchneck  United Kingdom
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Just checking - max voltage output is 50v? I'm just wondering if this would also be a great match for class A/B at 45V, or if the All Cee is the better match? I'm just thinking that it's useful to have the higher current of SLB in A/B designs, as there is potential to bias further into class A.
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Old Yesterday, 02:45 PM   #967
xrk971 is offline xrk971  United States
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
Max voltage is 50v due bulk cap rating. The LT3420 is limited to 70v. Most Class AB amps have very good power supply (ripple) rejection ratio and may not need the totally quiet output of an SLB. Note that the SLB max steady state current is fixed. Unless you add a large bulk cap after the SLB, you may not have enough transient current response for your Class AB amp. However, it will be darn quiet, about -50dB lower 60/120/180Hz (50/100/150Hz) than with an all C or CRC supply.

Some folks add a cap bank in between the cap multiplier and the amp. Actually I have done this with a custom 22x 1000uF x 2 rails cap bank. This lets you use lower cost low ESR 1000uF caps. But just an extra 4700uF on each rail output of the SLB should really improve bass authority on Class AB.
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