You can get a red laser diode pretty cheap these days—as cheap as £1 in fact. [Beamer] had purchased one himself, but quickly grew bored with just pointing it at the walls. He decided to figure ...

At the heart of the laser beam sender is a standard 650nM red laser diode having 5mW of power. The laser diode is fired by a 5 V dc supply with the help of two supporting components D1 (1N4007) and R1 ...

You can get a red laser diode pretty cheap these days—as cheap as £1 in fact. [Beamer] had purchased one himself, but quickly grew bored with just pointing it at the walls. He decided to figure ...