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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 20th July 2019, 07:38 PM   #481
ferret is offline ferret  South Africa
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Hmmm,
I just looked at the quick reference in the RS specs, which when checked out at the unabridged spec is in fact referenced to 20kHz. The 120Hz for the 22k is 7.89 A and the 15k one is 6.56 A. In future I will only look at the full spec. Once burnt, twice shy.
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Old 26th July 2019, 05:38 PM   #482
ppap64 is offline ppap64  Canada
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Picked up my boards, really nice work !
Thanks to all.
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Old 27th July 2019, 04:16 PM   #483
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
Hi Folks,
We have a new item under development for a GB: a solid state relay (SSR) DC protection and turn-on delay board. The nice thing about this item is that it will be fully professionally assembled and tested. You just need to solder your own choice of speaker connector (spade, Miolex, or flying lead) and it is read-to-run (RTR). More info here:

Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
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Old 28th July 2019, 09:06 PM   #484
metaphile is offline metaphile  United States
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I purchased and have mostly populated an SLB dual rail supply (thanks, board is really nice!) for use in my first big amp build: an F6. I am awaiting the Antek 3222 trafo as well. I'm planning to use a single SLB (at least to start with) and try the grounding scheme described earlier in the thread.

I'm wondering if you have a recommendation for crimp-on spade connectors and a (budget-conscious) crimper tool to use with them.

I'd like to use insulated connectors like these and found an economical crimper from Titan tools.

I'm also curious what the AWG is on the trafo secondaries as it doesn't seem to be listed on Antek's website so I can purchase the correct sized connectors and tool.

Thanks for all the work put into this!
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Old 28th July 2019, 10:30 PM   #485
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
Nice assembly work, Metaphile!

The Antek 3222 secondaries appear to be 14ga. I use many crimpers, and if you get the usual insulated Fastons and loop connectors, these tools work well:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

They squeeze the metal ferule into a square box shape. I also like to crimp with a good bite from a Klein model 1005 prior to use in above crimper for extra security.

https://www.amazon.com/Insulated-Non...91&s=hi&sr=1-4

As far as insulated Faston terminals, these work well:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

and 14-16ga insulated loop terminals:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Hope that helps. Oh, and you can never have too many crimpers or donut trafos! Those red Kleins on the far right will handle most insulated non-insulated in all sizes and lots of leverage, plus they cut wire too. I have had those for 25 years and still use them almost every day when making amps.

The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB-crimpers-jpg
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Last edited by xrk971; 28th July 2019 at 10:41 PM.
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Old 28th July 2019, 10:42 PM   #486
metaphile is offline metaphile  United States
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Thank you for the quick reply!

Just completed the board, pics attached .
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Old 28th July 2019, 10:52 PM   #487
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
Nice work! Be sure you hand trace the wires from the flying leads to the correct pins - look at schematic to make sure BCE goes where you expect it to. Also, don't power up with load connected and forget to attach the Molex connectors. It will blow the 68R resistor and possibly the driver transistor.
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Old 29th July 2019, 12:34 AM   #488
metaphile is offline metaphile  United States
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Appreciate the advice, xrk -- I am indeed planning to use the flying leads and a Molex connector to attach the transistors to the front panel of the 4U chassis -- will be sure I hand trace the wires per the schematic before power up. Will be at least a couple of weeks before I'm ready to power up.
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Old 7th August 2019, 11:33 PM   #489
evanc is offline evanc  United States
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The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
Overdue photos and a thank you.

I have two channels of aleph j goodness powered by this very nice power supply. Both boards fired up with no problem. The amps are absolutely silent when no music is playing. The 22000 uf caps don’t heat up at all. Thanks again for this well worked out power supply.

Sorry for the sideways photos.
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Old 8th August 2019, 12:06 AM   #490
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
Nice work Evanc! Glad it is silent!

Silent amps are the best amps!
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