power supply design

Attached are 2 photos of an L.E.D circuit. The tape is labeled 3v. However, when I tried to verify circuit voltage by sharing the image with Copilot, it kept telling me that it is labeled 5v. Is this an error on behalf of the AI system? If so, can anyone confirm that this circuit should be...

Hi, I'm new to this forum (and forums in general). I am starting my second year of engineering school (midlife career change) and have a problem I have been trying for figure out, on and off, for about a year. With an unregulated 35VDC input I am wanting to use a MCU (ESP32 specifically) to...

Help! I have an old natural gas engine that I have designed a Capacitor Discharge Ignition module for. The module uses a pre-made boost circuit that takes 12vDC from a truck battery / solar cell and boosts it to 350vDC that I then route to my ignition circuit. This worked great on the bench...

Hello, I have a power supply which have V480LA10P varistor connected at input between line and neutral but I want to replace it with the V480LA40AP from same family. Looking at datasheet they seem to have almost similar characteristics except for "Peak Current 8 x 20µs" and "Energy 10 x 1000µs"...

Hello I am making a power supply to power a Raspberry Pi/camera/touch screen (5V @3A), and some LEDs, servos/motors (12V LEDs and 9V servos/motors). I am using a 12V/5A adapter to supply power, and an LM2576 switching regulator to take the 12V down to 5V @3A for the pi etc. and a 7809 to drop...