Got a 2n2222 npn?

Want one of the worlds simplest oscillators?



Here's the end result, it's got three interesting features..

1. It's an exploit of this type of transistor, as it should not really work

2. Current is really quite low even though i used a 1000uf 16v cap only a few ma no more than 1 - 5ma, this would be an ideal security car alarm as it does not flash, it pulses which implies extra gubbins/circuitry which leads to the plausibility of it being a real car alarm

3 the reverse collector/emitter once it reaces a certain voltage, the collector emitter opens up and the capacitor drains away to the led until the voltage is low enough and the transistor is pinched off


It will run off a car battery for months if not years, very efficient considering

 

Although stepping up the voltage might be required, i should try it at 11.8v