Temperature controlled oscillator

Output frequency or tone of this oscillator circuit varies with the temperature at which the input germanium diode is held. Reverse resistance of D1 varies from 500- © to 10 K ©, when temperature varies between 200C and 800C. (At higher temperature germanium devices show very low resistance. ) This variation of resistance changes the tone of the ou

tput sound of the oscillator which is built around the AF amplifier IC (IC1). Instead of germanium diode, base-emitter junction of an ordinary medium-power transistor such as AC128, AC188, 2N360 or 2N610 can be used. This circuit will not work with silicon diodes.

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