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Recurring toneburst generator
34 other sections not shown
0.01-fiF capacitor 35-V electrolytic capacitor 555 astable multivibrator 555 timer IC 556 dual-timer IC alternate component values appears in Fig appears in Table applications astable multivibrator circuit astable multivibrator stage chip circuit of Fig circuit shown circuit's supply voltage circuitry CMOS component values suggested control voltage diodes duty cycle electrolytic capacitor C2 experiment with alternate fiF capacitor following component values goes high IC1 556 dual-timer kQ R2 LED D1 magnetic reed switch monostable multivibrator stage output frequency output goes output pulse output signal photoresistor pin numbers potentiometer R2 power supply project appears Project of Fig R1 and R2 relay reset resistance resistor R2 second astable multivibrator second timer stage shown in Fig stabilizing bypass capacitors suitable parts list theremin timer circuit Timer Project timer section tone bursts transistor triangle wave trigger input trigger pulse truth table unused voltage-control inputs values for capacitors values of resistor waveform