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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 16th August 2019 05:31 PM

I have found that a $150 computer workstation UPS provides excellent 120v voltage regulated and clean AC mains vs a straight from wall plug. As a bonus, you get music to play through a short blackout.

Here is what I use:
https://www.amazon.com/dp/B000FBK3QK..._zFUvDb2VZENZY

TungstenAudio 16th August 2019 05:50 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-post5886224.html#post5886224)
I have found that a $150 computer workstation UPS provides excellent 120v voltage regulated and clean AC mains vs a straight from wall plug. As a bonus, you get music to play through a short blackout.

Here is what I use:
https://www.amazon.com/dp/B000FBK3QK..._zFUvDb2VZENZY

I wouldn't put one of those "simulated sine wave" backup supplies in the same room as my main audio system. This is the opposite of clean power, and is effectively a permanently installed Quasimodo noise generator plugged into your system. About the worst recommendation I can think of for a high resolution audio system.

xrk971 16th August 2019 06:05 PM

I guess it all depends on particular model. When not running on batteries, it’s regulator puts out quite a bit cleaner power than my dirty mains - measured with an (checked with o-scope) and you can see the vast improvement with the FFTs from the amp. It really depends on the particular unit. I have no extra-added noise issues with this one, and it actually cleans up the dirty mains.

xrk971 26th August 2019 03:16 AM

We had a few more successful Alpha 20 builds with the SLB posted earlier today (yesterday) by Bigaudioscotto and Raptorlightning.

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier

https://www.diyaudio.com/forums/atta...r-img_2256-jpg

Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier

https://i.imgur.com/YJE4FO4.jpg

Very nice work, gentlemen!
:cheers:

Oneminde 2nd September 2019 07:49 PM

Hello fellow diya. Since I am among friends, allow to me say a big thank you to Jhofland, AKSA and xkr971 for their work and time spent on developing this regulator. I stumbled upon it while doing research for my upcoming preamplifier project UGS MUSES Scion. My ambition is to give it the best "fighting" option I can so that as much as possible of the noise is pushed down to a minimum, and it has to start with the power supply. I had settled for the Salas Shunt regulator and "only" had the diya universal power supply as an option. Reading that the SLB was using active rectification and capacitance multiplier, I knew I had stumbled upon something fantastic.

Reading that at high loads, the SLB showed 1mV ripple, made me even more ecstatic. This was it. Since its a preamp, the SLB will not even break a sweat and the over sized transformers will barely be on. 48VA on an architecture that consume roughly 0.6VA... I've been in the planing stage for a while, selecting components etc. and now I finally have the PSU selected.

I am not an engineer, at best, I can call myself a designer and optimizer, so I am in need of engineers that just get it and know how to do things. This is a legendary rectifier and performance. You can all be very proud of yourself. Well done :)

Oneminde

xrk971 9th September 2019 08:01 PM

Just ran out of SLB's, and so I just ordered another 50 SLB dual rail PCB's. Still same bullet-proof 2mm thick, 2oz copper, ENIG finish and blue mask boards. Should have them in about 10 days in case anyone is ordering them.

gaborbela 10th September 2019 02:46 AM

X I sent you a PM.

Greetings gabor

AKSA 10th September 2019 11:44 AM

Wow, thank you Oneminde!! Very charming of you!

Hugh (and XRK, JP, Jan!)

xrk971 10th September 2019 12:04 PM

Quote:

Originally Posted by Oneminde (https://www.diyaudio.com/forums/group-buys/336479-slb-smooth-butter-active-rect-crc-cap-mx-class-power-supply-gb-post5903683.html#post5903683)
Hello fellow diya. Since I am among friends, allow to me say a big thank you to Jhofland, AKSA and xkr971 for their work and time spent on developing this regulator. I stumbled upon it while doing research for my upcoming preamplifier project UGS MUSES Scion. My ambition is to give it the best "fighting" option I can so that as much as possible of the noise is pushed down to a minimum, and it has to start with the power supply. I had settled for the Salas Shunt regulator and "only" had the diya universal power supply as an option. Reading that the SLB was using active rectification and capacitance multiplier, I knew I had stumbled upon something fantastic.

Reading that at high loads, the SLB showed 1mV ripple, made me even more ecstatic. This was it. Since its a preamp, the SLB will not even break a sweat and the over sized transformers will barely be on. 48VA on an architecture that consume roughly 0.6VA... I've been in the planing stage for a while, selecting components etc. and now I finally have the PSU selected.

I am not an engineer, at best, I can call myself a designer and optimizer, so I am in need of engineers that just get it and know how to do things. This is a legendary rectifier and performance. You can all be very proud of yourself. Well done :)

Oneminde

Hi Oneminde,
Thank you for the kind words. The credit goes to Aksa and Jhofland for their design and layout of this superlative power supply. I finally had time to briefly read post 1 of your UGS Muses preamp project thread. Thatís a fine looking preamp and I really like the old school LED matrix display. It looks like a 2SK170BL based input stage preamp. I could not find a schematic in your thread so donít know the particulars. I wasnít clear of the circuit requires single or dual rail voltages and what those voltages were.

The SLB could indeed work - but it would be overkill as all you need is 50VA (probably <100mA?).

I am not sure an active rectifier would do much for you - but they are inherently quieter than diodes. You would need to resize the CRC for your particular load and voltage. I bet you could aim for 20uV ripple if the current is low and the caps and resistor in CRC are properly sized.

One more thing, the PSU stage of the Yarra amplifier is a dual monoblock CRC/cap multiplier power supply expressly designed for preamps. You might consider just using the PSU from that project. While you are at it, you might consider the Melbourne preamp input stage in the Yarra. Itís interchangeable. You can go for JFET MOSFET source follower SE Class A, Wayneís BA 2018, or any of the M2X input stages of you only need unity gain.

The Melbourne is special in that it can drive up to 52Vpp cleanly in order to power zero dB gain amps like an F4 or MOFO.

Dadbeh 10th September 2019 12:25 PM

Question:

I want to use the dual rail SLB to power this amplifier: [2 pc] PCB for 56W Audio Amplifier LM3875 HiFi Amp, Gold F5

it requites between 36v to 42v for the rated power output.

I have an Antek 500VA and 50v transformer and according to XRK971:

Quote:

50v trafo will make 70vdc at the bulk caps. Hence, all caps need to be rated for 75v+ then. The size of the cap will get smaller for a higher voltage. You need to find one that is circa 10,000uF and 75vdc and with an appropriate ripple voltage rating. We will also need the rated load current yiu expect to run at.
I want to know if I can use this transformer and SLB to power the above amplifier and similar ones (I also want to build a 3886 with the same SLB and transformer but haven't ordered the PCB yet.)
I am also considering the ABBB amplifier. so I would be using the SLB with various amps rated 60watts to 100 watts and I want ot know if I can use the 500VA 50v transformer.


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