Two-tone call on microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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A two-tone chime bell is assembled on two microcircuits and one transistor.
(click to enlarge)
Logic elements D1.1-D1.3, resistor R1 and capacitor C1 form a switching oscillator.
When the power is turned on, the capacitor C1 starts charging through the resistor R1. As the capacitor charges, the voltage on its lining increases, connected to terminals 1, 2 of the logic element D1.2. When it reaches 1,2 ... 1,5 V, a logical "6" signal (1.3 V) will appear at the output 1 of the D4 element, and a logical "11" signal (1.1 IN). After that, the capacitor C0 begins to discharge through the resistor R0,4 and the element D1. As a result, rectangular voltage pulses will be formed at the output 1 of element D1.1. The same pulses, but shifted in phase by 6 °, will be at terminal 1.3 of element D180, which acts as an inverter.
The duration of the charge and discharge of the capacitor C1, and hence the frequency of the switching generator, depends on the capacitance of the capacitor C1 and the resistance of the resistor R1. With the ratings of these elements indicated on the diagram, the frequency of the switching generator is 0,7 ... 0,8 Hz.
The switching oscillator pulses are fed to the tone generators. One of them is made on the elements D1.4, D2.2, D2 3, the other - on the elements D2.1, D2.4, D2.3. The frequency of the first generator is 600 Hz (it can be changed by selecting elements C2, R2), the frequency of the second is 1000 Hz (this frequency can be changed by selecting elements C3, R3). When the switching generator is running, the output of the tone generators (pin 6 of element D2.3) will periodically receive either the signal of one generator or the signal of another. Then these signals are fed to the power amplifier (transistor V1) and converted by head B1 into sound. Resistor R4 is needed to limit the base current of the transistor. Trimmer resistor R5, you can choose the desired sound volume.
Fixed resistors-MLT-0,125, tuning-SPZ-1B, capacitors C1-C3 - K50-6. K155LAZ logic circuits can be replaced with K133LAZ, K158LAZ, KT603V transistor - with KT608 with any letter index. The power source is four D-0,1 batteries connected in series, a 3336L battery or a stabilized 5 V rectifier.
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