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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 6th May 2019, 12:54 PM   #141
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
GB status update - Please review for accuracy and let me know if I made a mistake:

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 - *Invoice sent*
yoaudio - 2 boards - Paid
van of monks - 2 boards - *Invoice sent*
Wtl - 4 boards - Paid
cerole - 2 boards - Paid
s610adam - 4 SLB - 6 SLB-SR - Invoice sent
pbergstrom - 2 boards - *need PayPal address*
ferret - 2 boards - Paid
Roundtoit - 2 SLB boards, 2 SLB-SR boards - Invoice sent
Tubesguy - 1 SLB board - Paid
Kokanee - 8 boards - Invoice sent
Arthur - 10 boards - Please send Paypal address
Thanks for all the great interest. I will post the Gerber image and BOM for the SLB-SR shortly as soon as I get the Gerbers from Jhofland.
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Last edited by xrk971; 6th May 2019 at 01:02 PM.
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Old 6th May 2019, 12:59 PM   #142
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
Btw folks, I received a question from a member who wants to use this as a PSU for a 100w Class A Babelfish Aleph J X Pass DIY amp that draws 7A continuous current. Hugh says that this can still work with low ripple by replacing the BD139/140 with a BD679/680 Darlington and a few resistor changes. I will post schematic as soon as I get things sorted out but short answer is yes. It was designed initially to handle 5A so 7A is not too far off.

https://www.st.com/resource/en/datasheet/bd677.pdf
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Last edited by xrk971; 6th May 2019 at 01:16 PM.
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Old 6th May 2019, 01:35 PM   #143
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
Some independent testing of the SLB topology on an actual SE Class A amp. This data is provided by Vunce and voltage is 37.4Vdc at 3.925A current. Red trace is the 10R for R117 and yellow is 1R5 for R117. Voltage drop on both is about 3.2v. The yellow trace, well it’s smooth like buttah!

The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB-f8bc79d0-e7e6-458c-8fda-56878d157086-jpg
Attached Images
File Type: jpg F8BC79D0-E7E6-458C-8FDA-56878D157086.jpg (998.6 KB, 707 views)
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Old 6th May 2019, 01:39 PM   #144
nautibuoy is offline nautibuoy  United Kingdom
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Quote:
Originally Posted by xrk971 View Post
Thanks for all the great interest.

Thank you (all involved) for the GB opportunity
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Old 6th May 2019, 02:33 PM   #145
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
Default SLB-SR Schematic and BOM

Here is the PCB top view and the BOM in pdf and csv (zipped).
A big thank you to Jhofland for superb layout!


The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB-slb-sr-pcb-top-view-png

Here is a zoomed in easy to use jpeg of the schematic:
The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB-slb-sr-schematic-closeup-v1-5-2019-jpg

The SLB-SR PCB's are $17ea, and usual shipping for one pair in USA is $5, $10 in CAN, and $15 everywhere else.
Attached Images
File Type: png SLB-SR-PCB-Top-View.png (84.7 KB, 3422 views)
File Type: jpg SLB-SR-schematic-closeup-v1-May-5-2019.jpg (170.5 KB, 503 views)
Attached Files
File Type: pdf SLB one rail schematic May 5.pdf (50.6 KB, 68 views)
File Type: pdf slb_single rail_BOM_May5.pdf (85.7 KB, 73 views)
File Type: zip slb_single rail_BOM_May5.zip (848 Bytes, 45 views)
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Last edited by xrk971; 6th May 2019 at 02:48 PM.
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Old 6th May 2019, 04:00 PM   #146
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by xrk971 View Post
Btw folks, I received a question from a member who wants to use this as a PSU for a 100w Class A Babelfish Aleph J X Pass DIY amp that draws 7A continuous current. Hugh says that this can still work with low ripple by replacing the BD139/140 with a BD679/680 Darlington and a few resistor changes. I will post schematic as soon as I get things sorted out but short answer is yes. It was designed initially to handle 5A so 7A is not too far off.

https://www.st.com/resource/en/datasheet/bd677.pdf
Hi X,

Would the changes to darlington be very stable (not prone to oscillation) and will this require modding the PCB or fit in current TH holes? Would also be nice if the PCB could accommodate the Mega-Fit connectors. They're much easier to play with then fast-tab. See Mouser 538-172065 (2 and 4 connectors).

Thanks
Do
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Old 6th May 2019, 04:14 PM   #147
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
Hi Pinnocchio,
The stability would be handled by increasing the base resistor values by 5x and probably using maybe 3R3 or 4R7 on the R117/R118 feedback resistor. I suppose it needs to be tried first. The recommended Darlington is same size as BD139/40 (TO-126) but pink it’s are reversed so mount flipped around and use smaller stamped aluminum fin heat sinks rather than huge extrude Fischer style AAVIDs (which are overkill). It’s only 250mW dissipation as I recall.
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Old 6th May 2019, 04:24 PM   #148
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by xrk971 View Post
Hi Pinnocchio,
The stability would be handled by increasing the base resistor values by 5x and probably using maybe 3R3 or 4R7 on the R117/R118 feedback resistor. I suppose it needs to be tried first. The recommended Darlington is same size as BD139/40 (TO-126) but pink it’s are reversed so mount flipped around and use smaller stamped aluminum fin heat sinks rather than huge extrude Fischer style AAVIDs (which are overkill). It’s only 250mW dissipation as I recall.
Hi X,

I just looked and pinout seems identical (ECB). Is this something you could test on your side? I don't want to spend 50$USD + components and find out it does not work. What about the mega-fit connector option?

Thanks
Do
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Old 6th May 2019, 04:30 PM   #149
gionag is offline gionag  Italy
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Hello !
great stuff...
is it possible to use in a circlotron configuration ?
afaik the two regulated side must be floating.

not sure if that is suitable or not with your design.

Thanks !
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Old 6th May 2019, 04:36 PM   #150
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
My mistake about the ECB pinouts - in that case, no issues there. If you notice, we are using a 4-pin AMP high current quick connect for the slave BJT flying leads. They work ery well. I think that is a great idea to use them for main power in and power out, but then most people already are using spades (FASTON) for their systems so I want to make the transition as seamless as possible.

Maybe in the future I can have an SMT active bridge with all Molex Megafit or AMP quick connectors. It would make for a much more compact and snappy to connect board.

One nice thing about FASTONs is that they are very low profile and have none of the bulk of a plastic shell.

If I have some time, I can test the 7A out but need to order the Darlingtons. Finding a suitable 7A load is tough to find - what is the voltage of the amp you planning to use this in? I can't seem to get the voltage anywhere after spending 20 min looking in that BAJX thread. You would think that is a pretty basic thing to specify in the first 5 schematics presented.

One thing is for sure, it will probably give you at most 10mVrms with the existing BD139/140 circuit as is. That's still a lot better than what a plain old monster CRC that was planned (those are in the 100's mV range). I am trying to get it down to 1mVrms which is why trying the Darlington.
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Last edited by xrk971; 6th May 2019 at 04:44 PM.
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