Currently under heavy review
This is the evolution of my General Purpose PSU for small-signal projects. The full-sized boards felt a bit of a waste of space for some projects where there is no need for 55mm capacitors or dual 5W resistors.
The design is pretty standard. We can connect secondaries either in series or in parallel, feeding a full wave rectifier through a Quasimodo Snubber, which then leads to the main CRC/CLC filter and a bleeder resistor with a LED indicator.
Note
Please read the entire project, including any notes or safety warnings, before you determine if the described actions are applicable to your equipment, and that you have the required expertise and skills to implement them according to the safety laws and regulations in your area.
The boards are designed to be 50x100mm, which allows us to panelize them to 100x100mm. This is both cheaper and allows the boards to be wired in series for dual PSU configurations. And if we need a single rail, we can always split them on the v-cut.
Below you can see the actual boards
And here is a single rail being tested for my SL1200
The boards are compact and dense, but still allow for a clean build. Here is my latest SL1200 external PSU.
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BOM
You can find the current BOM here
TODO
There are a few things I wish I had included.
- PPTC fuses on the input.
- Screw terminals both on the input and on the output.
- Move the input and output terminals a bit further away from the screw mount holes. With washers they are a bit too close.
- Site Update: The projects need to be updated to show the small PSU.
Neither of them are showstoppers though.