Back when I was learning KiCAD and before I learned to make jumpers only at 90 degree angles. No idea what I was thinking with C-B-A-D but this was in the hazy years of trying pain killers of every sort after the broken neck and back… But I managed to figure out circuit design, op amps, offset currents, shunts, PCB layout, soldering, single and double sided boards, and both laser toner transfer (bottom) and photoresist (top) based circuit etching, plus using toner transfer like a screen print.
Did you have a use in mind for these? Or was it more of a “because I can” project?
I have several LED strips in my room and around my workstation. I wanted to do a day to night cycle with PWM fading between 2k7 and 5k5 color temperature strips and the ability to fade or make my workbench ultra bright. I also wanted to monitor and measure current just because I can while juggling multiple channels of output like to offset the pulses and lower peak power use. I think I originally intended for the circuit to be a general purpose 4 channel switch where the LED app was just the initial purpose.
