If you have an old ATX PSU knocking around you can build a tidy 12V, 5V, 3.3V and variable DC lab power supply (to 35V) for electronic projects and wotnot.
My ATX PSU is a Zalman ZM550 Goldrock, but any old ATX supply would do, I think.
Components and circuitry
I used the component list and circuit from video below (all AliExpress) by @Siron_DIY. I’m not really a cat person, but I do like the feline intrusions throughout his videos…and he does some cool stuff!
Points of difference with my design? Just aesthetic really, except for the fuses:
- Vertical orientation for desk space and different look
- 3D printed fascia with LED backlights to illuminate voltages.
- Old Bakelite knobs from a 1930s radio to control voltage and current. Tried to put a bit or Art Deco into the styling/ form of 3D printed fascia (unsuccessfully?)
- Automotive blade fuses for each supply so a short should blow a fuse and not something important.
Components
Original @Sorin_DIY build:
- 80W buck/boost converter: https://s.click.aliexpress.com/e/_c4e…
- Volt/ammeter 4 digit: https://s.click.aliexpress.com/e/_c3F…
- Potentiometers 1K+100K: https://s.click.aliexpress.com/e/_c3T…
- Binding posts: https://s.click.aliexpress.com/e/_DFU…
- 10W 47R resistor: https://s.click.aliexpress.com/e/_c4a…
- USB port: https://s.click.aliexpress.com/e/_omi…
Additional:
- 5x 470Ω resistors
- 5x green LEDs
- 5 x 10A blade fuses and fuse holders
Circuits
Images below are from here and here.
Variable supply
The buck converter has two on board potentiometers which we replace with 1K & 100K ones.
- 1K on the left-hand side is for current regulation – the constant current (CC) control.
- 100K on the right-hand side is for voltage regulation – the constant voltage (CV) control
Ammeter/ voltimeter
LED backlight
3D files
