switching

Hello, I'm hoping to modify a simple circuit but I'm not sure what I have in mind is possible without replacing one of the main parts. The application was for adding water to two rechargeable banks of 2 volt batteries, a process that took a very long time pouring from a watering can, which had...

Hi Everyone! I have reached a point of semi-desperation with a project on which I am working for over a year now. There is one issue I doesn't seem to be able to fix. I have a nixie clock pcb which drives 6 apa106 rgb leds. I am trying to wire it up to be able to turn off three of these leds...

Hi, Please share your opinion on noise reduction techniques in mixed-signal circuits, PCBs. your experience, tips .. etc

Hi all, I feel like I am stuck because don't know how to solve following "simple" solution: Somehow I have to (each 60 min) activate 12V/2A electromagnet, with 5V input voltage (tipical PC USB (5V/100mA). 5V is powering microcontroller, and with that microcontroller, each 60 min I have to...