The circuit is too simple so that it can be enclosed in a small box. A 12 volt miniature battery is used to power the circuit. Two transistors T1 and T2 are used as electronic switches to turn on / ...

I also have some discarded 1980s track-lighting fixtures, which used 12-volt incandescent bulbs. I swapped in some LED spotlights, then added a few more to bulb sockets screwed onto a 1x6 pine board.

Testing a new headlight before you install it can save time, money, and frustration. Whether you’re checking a replacement ...