The flasher circuits below operate on a single 1.5 volt battery. LED flasher circuit diagrams. The circuit on the upper uses the popular LM3909 LED flasher IC and requires only a timing capacitor and ...

There are just two resistors, a small-signal transistor such as a BC547, one ‘flashing’ LED and a string of ‘normal’ LEDs. The flashing LED works as an oscillator and switches the transistor on and ...

LED flasher circuit. With cycling safety in mind, I bought a pair of low power red LED things that replace the bungs in the end of drop handlebars. ... Also, some sort of Zetex/Diodes matrix ...