PNP and NPN Oscillator (MSB120E)

This traditional oscillator uses two complementary transistors to produce low frequency signals. The signals can be converted in sound if a loudspeaker is used to replace R3. Any 3 to 16 ohm loudspeaker can be used. R1 can be also replaced by a potentiometer to control the frequency. The circuit can be powered from 1,5 to 12 V sources.








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Circuit Bench