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GB for Simple Cap-Mx Regulated Low-Noise PSU
GB for Simple Cap-Mx Regulated Low-Noise PSU
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Old 22nd February 2019, 10:41 PM   #1
xrk971 is online now xrk971  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
Default GB for Simple Cap-Mx Regulated Low-Noise PSU

Have you ever found yourself making a basic circuit that is so simple, that you say to yourself, "it's so simple I will just make it from scratch on veroboard..." It works so well and is so useful, it becomes an integral part of many of your future projects. Before you know it, you have hand-assembled on veroboard the same circuit a dozen times. Well that's what I have been doing whenever I needed a source of ultra quiet (battery-like) single-rail DC power in the range of 5v to about 32v and current under 1amp. I use this countless times for low noise headphone projects, DACs, etc. Well, I sort of got tired of making them from scratch and worked with JPS64 to put it on a simple 50mm x 75mm board the following: a CLC filter, an Easy-Peasy Juma cap multiplier, and a 78xx regulator, and throw in some smoothing caps, snubbers, output bypass caps, and LED power indicator, and input/output terminal blocks. I typically use a 12v 1000mA Class 2 transformer wall-wart ubiquitous with routers and switches that we accumulate over the years. That then powers a clean DC-DC step up converter to about 4v+ regulator dropout (circa 2v) above our needed voltage. So for example, if you need a clean 18v supply, add 5v or 23v as the DC-DC stepup output. Put that into this unit, and let its cap CLC filter, cap multiplier, and voltage regulator give you a clean source of 18v with ripple as low as 4uVrms (if you use a TO-220 formatted TPS7A4xxx LDO regulator). If you can live with 50uV noise,a simple 7818 regulator will work fine. I have used this on countless headphone amps and the noise floor measures flat like a battery. Absolutely no mains hum gets through.

Thanks to JPS64 for a great layout with all the customary via stitching and double planes of copper for low impedance current paths.

So here is the circuit:
Click the image to open in full size.

This is what it looks like built up in prototype stage v1:
Click the image to open in full size.

And here is the board will look like for the v2 (will be 1.6mm thick, 1oz copper, green mask, and ENIG finish):
Click the image to open in full size.

Here is the top view of the parts placement. BOM for the board is relatively cheap if you are going with just a 78xx. You need an N-channel TO-220 MOSFET such as an IRF610 or the Fairchild equivalent. IRF510 etc works well too. A few caps and resistors, some connectors, and a basic inductor to keep the DC-DC noise even more isolated.
Click the image to open in full size.

If interested in this little PSU board as a GB, please add your name, number of boards, and country to ship to below.

Like this:
DIYJohnDoe - 2 boards - USA

Pricing will be about $10 ea and tracked shipping in a padded bubble envelope mailer is the usual $5 in US, $10 for CAN, and $15 everywhere else. Maximum 8 boards per order for the above shipping prices.

Thanks,
X

Some supporting info, you can see in the photo below, a hand-made variant of this PSU (without a voltage regulator) powering my Aksa Lender preamp, the DC-DC step up is visible as well. Here I was running 48vdc output so a 78xx regulator could not have been used as they max out at 35vdc input:
Click the image to open in full size.

Here is the FFT from the Aksa Lender showing the typical clean battery like noise floor:
Click the image to open in full size.

Another example is the PSU that is built into the DCA Single ended Class A HPA (also without a VR):
Click the image to open in full size.

Here is the typical FFT from the DCA:
Click the image to open in full size.

Finally, another example is the similar PSU built into the Aksa-Lender preamp GB:
Click the image to open in full size.

And typical FFT of the Aksa Lender putting out 20vpp into 7kohms:
Click the image to open in full size.

So you can see how well this supply works in general and how I keep coming back to it. Just use a $4 to $7 DC-DC step up to get whatever voltage you need.

These types of DC-DC work well, for example:

DC DC 250w Boost Converter Step-up 10a Constant Current Power Supply LED Driver | eBay

400W 15A DC Step-up Constant Current Power Supply LED Driver Boost Converter | eBay

400W 15A DC Step-up Constant Current Power Supply LED Driver Boost Converter | eBay

DC-DC Step-up Boost Converter Constant Current Power Supply 10A 250W LED Driver 6472005271954 | eBay

Edit Feb 25, 2019: Member Twocents was a beta tester for v1 and he installed an eBay 5v TPS7A4xx LDO board on it - nice work!
Click the image to open in full size.

And use a 12v 1000mA Class 2 Wall wart like this, for example:
Click the image to open in full size.
Class 2 Power Supply Unit FL41A20U120V120A1000 Adapter 12V 1000mA Charger | eBay

Edit Mar. 14, 2019:
Click the image to open in full size.

You can use the Wurth 774701 Choke:
https://www.digikey.com/product-deta...mSeq=289294179

https://katalog.we-online.de/pbs/datasheet/7447017.pdf

Version 2 of the board:
Click the image to open in full size.
Attached Images
File Type: png Simple-PSU-schematic-v2.png (92.8 KB, 2118 views)
File Type: jpg Simple-PSU-build-v1.jpg (399.2 KB, 2502 views)
File Type: jpg Simple-PSU-top-render-v2.jpg (250.6 KB, 1797 views)
File Type: jpg Simple-PSU-placement-top-v2.jpg (74.6 KB, 1812 views)
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Last edited by xrk971; 5th April 2019 at 04:16 AM.
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Old 23rd February 2019, 12:20 AM   #2
Vunce is online now Vunce  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
Hi X,
This little psu pcb would be very useful to have for many projects. I was just contemplating how I want to feed my Korg B1 Buffer/preamp a super clean regulated 24vdc. Since I have the dc-dc step up and class 2 wallwart, this psu board seems like a great match.
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Old 23rd February 2019, 12:31 AM   #3
xrk971 is online now xrk971  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
Yes, preamps are the primary use for these power supplies. Although I can see that they would work well for high end DACs needing 9v of RPi’s needing a clean 5v source.
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Old 23rd February 2019, 03:52 AM   #4
drpro is offline drpro  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
DIYJohnDoe - 2 boards - USA

I'm in for two.
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I must build. Pass F4s, F6, M2, BA-3, B1Korg preamp, MoFo, ImPasse preamp, Whammy headamp, Aksa's Lender preamp, Salas DCG3 headphone/preamp, XRK971 PCA & DCA headamp Bruno Putzey's balanced preamp, Doug Self preamp, Pete Millet Korg headamp.
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Old 23rd February 2019, 04:14 AM   #5
xrk971 is online now xrk971  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
Thanks for starting it off DrPro!

Ok here is the beginning of the list.

DrPro - 2 boards - USA
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Old 23rd February 2019, 04:32 AM   #6
Vunce is online now Vunce  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
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Old 24th February 2019, 06:46 AM   #7
goldkenn is offline goldkenn  Hong Kong
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Old 24th February 2019, 06:57 AM   #8
xrk971 is online now xrk971  United States
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GB for Simple Cap-Mx Regulated Low-Noise PSU
Cool - we are getting a little more interest finally. Thanks DrPro, Vunce, and Goldkenn.
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Old 24th February 2019, 09:58 AM   #9
Yatsushiro is offline Yatsushiro  France
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Old 24th February 2019, 12:37 PM   #10
Mindfunk is offline Mindfunk
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