Lots of capacitors in a CLCLC configuration + a shunt voltage regulator: a high-end power supply for preamplifiers, phono stages and other HiFi equipment. The shunt regulator can run with a quiescent current of up to 500mA. With the onboard heat sinks, that you can see on the picture, the regulator ran well with 250mA quiescent current and no external load. In this configuration, the power consumption of the circuits is the highest, because the regulator has to “burn” the full quiescent current.
Both PCBs are available in our shop: UniSieb, Shunt regulator or as set of both PCBs.
We’re starting with some open source hardware projects now. The first design is a 8x10cm PCB for a symmetrical power supply. It uses 4 capacitors with a 30mm diameter like the nice old Roedensteinthat we found lately. If the UniSieb/Shunt combination looks like overkill for you and the small SimplePower is too simple, this is the right option.
The PCBs will be available in the shop later, but if you like to create your own or modify the design, just get it from the GitHub repository.
Today I found a pair of NOS[ref]new old stock – components that were produced sometime in the past, but were not used yet[/ref] ROE EYF 06 electrolytic capacitors. After measuring them I was lucky to see, that they still have full capacity (4800uF and 4700uF). And wow – these things look great! The gold color will look great on a black PCB. I’m thinking to design a new PCB similar to the UniSieb circuit, but with these capacitors (only 6 of them will fit on a 8x10cm board, because they are quite large with 30mm diameter).
Any other ideas how to use them?
The new PCBs for the shunt voltage regulator arrived. Now final testing starts. Unfortunately I ran out of electrolytic capacitors of the right size, therefore it will take some more days until the tests can go on.
One cool thing of about this new PCB – by just changing two jumpers you can select between 3 different quiescent currents. This makes it easy to adopt the circuit for different use cases.
As the name suggest, SimplePower is a simple power supply for audio devices. It uses a pair of LM317/LM337 to provide a stable output voltage. Add a transformer and you get a symmetrical power supply. This power supply will be used for our QuadVol project.
The SinCos power supply for turntable synchronous motors is available now in our shop. It upgrades your old turntable to with an quartz-stabilized power and has many features that improve the audio quality of your turntable.
If you do not want to flash the microcontroller by yourself, there are also programmed microcontrollers available.
Note: This power supply supports only low-voltage synchronous motors. If your turntable is direct driven or uses a DC motor, you cannot use this circuit.
I’m working on a new version of the K+T shunt regulator. The old PCB was very similar to the original K+T design. The new version will be bigger, but completely integrated for a symmetrical power supply.
The universal rectification and smoothing PCB is now available on circuits.io. You can order PCBs there or fork the design and use it in your own designs.