Nice looking SLB’s Kevin 😉
I used sockets for all my SLB’s, this way you don’t have to buy
so many dip8 LT4320’s which add up $$$ quickly. Just pop them out (carefully of course) of the amp not in rotation and installed them in the current amplifier your using 😀
I was noticing that there are a lot of projects that need lower voltage, but high current low noise supplies. Like Rasp-Pi based music streamers, or various high end DACs, etc. There is a good reason to use an SLB SR to provide the 3A to 5A at 5v or 9v for these projects to get the ultimate low noise background.
Assuming a 3v drop across the capacitance multiplier, and another 1v across the CRC, and 3-4v sag under load, about 3-8v on top of nominal is needed. So 9v would be about a 16v to 17v dc from a trafo under no-load conditions. So a 12vac 25VA or 50VA trafo would be good for a 9v dc requirement. For a nominal 5vdc supply, use a 9VAC trafo.
Assuming a 3v drop across the capacitance multiplier, and another 1v across the CRC, and 3-4v sag under load, about 3-8v on top of nominal is needed. So 9v would be about a 16v to 17v dc from a trafo under no-load conditions. So a 12vac 25VA or 50VA trafo would be good for a 9v dc requirement. For a nominal 5vdc supply, use a 9VAC trafo.
I've earmarked a couple of SLB dual rail boards for a +11V/-36V supply in a tube amp biasing context. I'll use different transformers (or secondary windings) for each half to avoid burning off lots of volts.
Hi XRK - is it possible to build 2 x positive rails with the dual rail PCB, or do I need 2 x single rail SLBs PCBs? 🙂
Thanks as usual!
Thanks as usual!
Two SLB SR's as the other side of the SLB dual rail is strictly designed for -ve voltage. How many amps of current do you need as one SLB SR is good for 5A.
Speedy response, thanks.
Current PSU (it's just a rectifier cap stage that outputs a nasty saw tooth that regulated in a separate enclosure) that I'm planning to replace with SLB is dual mono arrangement - trying to keep it the same.
I'll throw in an order for 2 x SR PCBs then 🙂 You're making too much good stuff 😛
Hi X - I've ordered 2 x SLR boards and am starting to gather the bits and bobs.
My SLR specific Mouser order/BOM is: Mouser Electronics (credit to Md_Stryker for original project)
My initial application is to provide raw DC to the Salas Phono (yes overkill) - load is ~100 mA (I'm strongly considering to just use one board!). If I need more voltage drop, do I increase R2 and R3?
Max. raw DC recommended by Salas is 50 VDC. My existing Tx is 36 V secondaries and given the low load I'm estimating only ~3V drop across SLB. Australia typically has high mains voltage too.
Thanks X.
My SLR specific Mouser order/BOM is: Mouser Electronics (credit to Md_Stryker for original project)
My initial application is to provide raw DC to the Salas Phono (yes overkill) - load is ~100 mA (I'm strongly considering to just use one board!). If I need more voltage drop, do I increase R2 and R3?
Max. raw DC recommended by Salas is 50 VDC. My existing Tx is 36 V secondaries and given the low load I'm estimating only ~3V drop across SLB. Australia typically has high mains voltage too.
Thanks X.
Hi Aive,
Thanks for the order - did you want the single rail, because you ordered the standard dual rail. This PSU has about a 3v drop adjustable by maybe 1v or so. If you need more drop, and you only have 100mA current maybe you can use a larger R in the CRC?
Alternatively, you can use my simple cap Mx and regulated PSU. It has a CLC filter, MOSFET capacitance multiplier (4v drop) followed by a 78xx TO220 voltage regulator. You can use a TPS7Axxx LDO with 4uV rms noise regulator in TO220 package.
This does not have a rectifier though as it was meant for use with a Class 2 wall wart or SMPS.
GB for Simple Cap-Mx Regulated Low-Noise PSU
This is an example of one by Twocents who is powering his DAC with it.
Thanks for the order - did you want the single rail, because you ordered the standard dual rail. This PSU has about a 3v drop adjustable by maybe 1v or so. If you need more drop, and you only have 100mA current maybe you can use a larger R in the CRC?
Alternatively, you can use my simple cap Mx and regulated PSU. It has a CLC filter, MOSFET capacitance multiplier (4v drop) followed by a 78xx TO220 voltage regulator. You can use a TPS7Axxx LDO with 4uV rms noise regulator in TO220 package.
This does not have a rectifier though as it was meant for use with a Class 2 wall wart or SMPS.
GB for Simple Cap-Mx Regulated Low-Noise PSU
This is an example of one by Twocents who is powering his DAC with it.
Hmm, my Etsy order confirmation email says:
Smooth Like Buttah (SLB) Class A PSU
Transaction ID: 1655781340
Dual or Single Rail: Single Rail
Quantity: 2
Price: $18.00
Item total $36.00
?? 🙂
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Phew - do you currently have these in stock for shipping? And are these the boards I need to flip the transistor (pin 1 in square hole)?
Thanks X 🙂
Yes I have these in stock if you don’t mind using a small stamped aluminum heatsink vs the large PCB mounted one.
I just got word that the new set of SLB and SLB SR (along with ABBB v0 and Yarra and WBA18 and PCA) just shipped via DHL express.
One more thing, if you want perfect crimps for the flying lead Molex, try this tool. I just got it and works superbly well. Good to have for the ABBB amp as well. I think we are going to be using Molex connectors on a lot more Aksa/Xrk/JPS64/jhofland designs, so not a bad tool investment.
IWISS Open Barrel Terminal Crimper Plier Tool for Molex Style DELPHI AMP TYCO Terminals Crimper Open Barrel 24-14 AWG - - Amazon.com
Example crimp on 18ga silicone insulation RC car wire:
Closeup of dies:
One more thing, if you want perfect crimps for the flying lead Molex, try this tool. I just got it and works superbly well. Good to have for the ABBB amp as well. I think we are going to be using Molex connectors on a lot more Aksa/Xrk/JPS64/jhofland designs, so not a bad tool investment.
IWISS Open Barrel Terminal Crimper Plier Tool for Molex Style DELPHI AMP TYCO Terminals Crimper Open Barrel 24-14 AWG - - Amazon.com
Example crimp on 18ga silicone insulation RC car wire:
Closeup of dies:
Attachments
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The CapMx board might be overkill for a Raspberry Pi solution. The onboard buck regulator is going to remove most of the benefit for hats powered off the GPIO bus and the SoC itself is likely to pollute the rails. I haven't looked much at the available DAC hats, but the ones I know of are powered off the Pi itself with no option for a cleaner analog supply. If one exists, then a smaller cap Mx might be appropriate since it wouldn't need more than a few tens of mA.
As far I understand the slb power supply will deliver 3.5amps , is that enough juice to power 2 of those m2x boards?
Maybe use one slb board for each channel?
Yes, design is for 5A continuous, so typical 2.5A (2 channels) is well within design. The star ground topology for the SLB with built in GLB (NTC and film cap to earth/chassis) seems to make for a very quiet amp despite not being a monoblock.