Transistor Frequency Doubler. The transistors before and after the diode multiplier. The circuit may use any npn transistor that operates at the frequency of the input signal.
Two transistor voltage doubler circuit. The following small circuit will create a dc output that may be nearly 2 times the supply voltage. O1 is connected as a phase splitter with anti phase signals appearing at its collector and emitter.
The two diodes c3 and c4 are a standard voltage doubler fed from the oscillator and feeding the resulting dc directly into the base of the second transistor.
Two transistor voltage doubler circuit. The signal is applied to the input of n1. Simple frequency doubler circuit this is a simple three transistor frequency doubler circuit to raise an audio frequency by a factor of two i e one octave. As such the rectifier and the transistor emitter must share the same ground.
