1156 incandescent bulbs work just fine, thank you. But for the inveterate farkler, everything and anything can and should be improved, changed or customized. That’s where the 18 LED “Tower” style LED ...

The simple Diode and LED Tester presented here costs under £5 to build (including all components, the battery and a cheap case) and will indicate the polarity of almost all types of LED and other ...