power control

It's been forever and a day since I've been here, but I'm dipping my toes back into electronics design Anyways, I have a "dumb" device that's connected to a hat on my Raspberry Pi 4. Unfortunately, due to some signaling issues with the dumb device, if it's on when the Pi powers on, the Pi gets...

Hello all, This is my first post so forgive me if I break any rules, I am trying to create a variable voltage power supply using an lm317 but am running into problems. For starters, it doesn't seem that I have a vref voltage, when probed I get 0 volts across input and adjust. My second problem...

Hi, I'm an engineer but not in the field of electronics. I live in the countryside and here the water comes from a 0.5HP electric water pump to the house, from a water tank. There are power outages quite often in winter, so I have some batteries with a solar panel and a inverter to manually...