DUAL_TONE_GENERATOR

Published:2009/6/24 2:39:00 Author:May | From:SeekIC

Two 555 oscillator/timers are configured similarly as audio oscillators, with each oscillator feeding a separate speaker.A dual 100-kQ potentiometer is use to tune the two oscillators simultaneously. The oscillators' frequency range is controlled by a dual-transistor switch, which selects the timing capacitor for both oscillators. Although the circuit only shows two range-switching circuits, any number can be added by simply duplicating the two-transistor switching circuit.



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