A small board with a full floating PSU unit that includes a full wave rectifier with a Quasimodo snubber and a CRC or CLC filter
The past few weeks I have been working on the PSU and regulator of my Technics SL1200 MK2 turntable, while migrating most of my old boards into KiCad.
At first I started re-working my General Purpose PSU board, which includes big footprints for screw-mount 52mm capacitors, and 50mm power resistors.
What quickly became apparent was that in low-wattage devices, the 100x100mm board wastes a lot of space. So I decided to also revive my old 50x100mm board that just includes 30mm capacitors and 16mm power resistors.
Here is a pic of my old design installed into my turntable’s PSU
There are minimal changes from my 2017 design.
I added the ability to wire the board for a negative rail, added pads to help wire transformers with two secondaries in series or in parallel, and added multiple output pads to help power multiple devices or reference boards to each other or to ground.
The design is fully floating, and allows the user to define any star ground points anywhere they are needed.
I will delay ordering new boards for a bit to fix any minor forgotten details.
The final board is 50x100mm, the mounting holes are 5mm from the edges in a 40x90mm square, and it supports up to 2mm wiring.