It's been a slow summer. I'm still making progress on the bench power supply. It's in the "just get it done so I can move on" phase.
I've got the regulator part of the circuit finalized. I don't think it's perfect, but I think if I ever want to work on something else, I need to move ahead. Since the powersupply has three channels, I plan to have 3 discrete boards.
Here is one of the boards, pre-soldering:
|One channel regulator board.|
On the left side of the board, there are two PWM'ed input for the voltage and current settings, and two "Vsense" and "Isense" analog outputs that will run directly to ADC inputs on the Atmega 644. The top of the board will have inputs from the ATX power supply at 12 and 5 volts. A variable 0-9V output will come form the bottom-right side.