Power Supply on the Cheap

A project log for Flood Fault Circuit Interrupter

Automate the local disconnection of electrical services during a flood. Enhance the safety of existing residential and commercial systems.

JonJon 04/23/2018 at 08:580 Comments

Our first power supply for the 5V circuits was a highly efficient switched mode power supply evaluation unit based upon a Texas Instruments chip.

However, a short-circuit during testing damaged that initial unit and an interim replacement was selected. Given the very low current draw of our 5V components, we selected a power supply recovered from a car charger based upon the MC34063 chip.