Temperature controlled oscillator

Posted on Feb 5, 2014

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

Temperature controlled oscillator
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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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