Simple Oscillator— no transistor
This is a replication of an experiment by Lasersaber here at YouTube. It is an oscillator that functions without a transistor and is not a “buzzer type”. There is a delicate junction between a carbon rod and a copper wire that forms the switching point of the circuit. The circuit operates a 12v / 110v AC transformer (backwards) and is shown driving a small 110v led bulb. A small 12v battery is used as the power source. The current draw is less than 1 amp. This is not efficient– but it is an interesting experiment.
Here is Lasersaber’s video showing the original experiment: