Custom Bench Power Supply

I'm working on a balancing bot project that needs multiple voltages and I've never had a decent bench power supply.

So in the middle of the other project I decided to build a 3-channel bench supply with 3 modes: Free-Running, Constant-Voltage and Constant-Current. 12V, 2A, on three independent output channels.

It has automatic output cutoff for 4 independent limits that can be optionally enabled on the fly to help protect things or limit the damage if/when I do something stupid 😉

The full working version with the first channel is totally working! The output is accurate to within 6mV and 5mA and the optional over/under voltage/current protections will cut the output to 0.016V within 100ms of any triggered event 😄

Two more channels to add and they will be super easy. RP2040 Zero MCU, INA219 voltage/current sensor, software programmable and controllable buck converter.…