Dual tone call. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Dual tone call. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators

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The two-tone bell contains a control oscillator assembled on elements D1.1-D1.3 of the K155LAZ microcircuit and generating control pulses, the frequency of which depends on the capacitance of the capacitor C1 and the resistance of the resistor R1.

Dual Tone Call

With the ratings indicated on the diagram, the switching frequency of the generator is 0,7 ... 0,8 Hz. The control oscillator pulses are fed to tone generators and connected in turn to an audio frequency amplifier assembled on transistor V1. The first generator is made on the elements of the chip D1.4, D2.2, D2.3 and generates pulses with a frequency of 600 Hz (regulated by the selection of elements C2, R2), the second generator is made on the elements D2.1, D2.4, D2.3 and works with a frequency of 1000 Hz (adjusted by the selection of elements C3, R3). The sound volume is controlled by resistor R5.

Details. Resistors of the MLT-0,125 type, trimming resistor of the SPZ-16 type; capacitors C1-C3 type K50-6; microcircuit K155LAZ, K133LAZ, K131LAZ, K158LAZ; transistors KT603V, KT608, KT503 with any letter index.

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