Ferdinand added a dc/dc converter circuit to the transistor tester, allowing it to be powered from 2 AA batteries instead of a single 9volt. This project is similar to our Part Ninja, itâ€™s designed to test various electronic components like transistors, diodes, resistors, etc, and display their pin out and basic specifications. [via]
I built my own version of this handy tool last weekend. I replaced the linear regulator with a small boost-converter. Now the circuit can be powered with two AA batteries.
The PCB is sandwiched between the battery holder and LCD, so to provide a handy device without need for a case. I had a lot of fun designing and building the circuit, so thank you DP for highlighting this project.