I was bored one weekend and decided that I needed an easy way to generate a 3.3v rail on my breadboard without a real power supply. So I designed this simple circuit to perform just that. The device is powered from USB and has two independent output channels, one for each rail on the breadboard. A button per channel makes for easy toggling of the power for a rail. The device is also equipped with current and voltage sensors for detecting over-current or under-voltage conditions. The breadboard power supply doesn't nearly match the performance of a true power supply, but it's simple and easy to work with and didn't cost nearly as much.
- Two individual output channels, one for each rail
- User selectable output voltage from 1.8v, 3.3v, or 5v
- Channel enable/disable per channel
- Over-current protection (device disables output on over-current condition)
- Under-voltage indication
Here's the circuit all assembled and ready to go:
The circuit fits right into the power rails of a standard breadboard.
