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Back when I first became interested in electronics, a simple way to make an oscillator was a circuit called an astable multivibrator. These got used a lot - the electronics magazines that I used to buy as a teenager were full of them. This is the form of it     The two transistors are arranged like a flip-flop, with either one or the other conducting. Unlike the flip-flop, where the conducting transistor will hold the other off, here the additional capacitors mean that after a pe ...