Melodic call with a random number generator. Encyclopedia of radio electronics and electrical engineering

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

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Melodious calls have already been discussed in "Radio", for example, in [1, 2]. I propose my version of a similar construction (Fig. 1), containing relatively few elements and using the laws of probability theory.

Two generators are made on the DD1 chip: one of them is a clock (GTI on the elements DD1.3, DD1.4), the frequency of the other ("high-frequency" - on the elements DD1.1, DD1.2) is divided by an arbitrary natural number - from 1 to 16 - counter-divider DD3. The signal of the "high-frequency" generator is fed to the input "+1" (account for increase) of the counting trigger of the DD3 microcircuit. At the end of the count, the code is loaded in parallel from register DD2. The result is a new frequency division factor.

Shift register DD2 works in this case in serial boot mode (from input D0). It is transferred to this mode by applying a low level to the input S. At outputs 1-3, the code is maintained constant during the cycle, and then changes to another according to the decline of the clock pulse coming from the GTI to the C1 input of the DD2 register. There is a shift of bits by bits of the register and loading of the next random bit to the input DO sequential loading. Consequently, the "high-frequency" generator is not only a master, but also serves as a source of a random number, which is subsequently stored at the outputs of the register.

From the output of the decoder on the diodes VD1-VD4, the impulse oscillations of the audio frequency are amplified by the current by the transistor VT1 and converted into sound by the dynamic head BA1. The duty cycle of oscillations is directly proportional to the coefficient by which the GTI frequency is divided. The result is an audio signal with a rich harmonic spectrum.

In the device, instead of those indicated in the diagram, it is permissible to use microcircuits of the K133, K555 series. The transistor can be any of the KT801, KT815, KT817 series, dynamic head - 0,25-1 W with a voice coil with a resistance of 8-16 Ohms. Diodes - any other low-power germanium, capacitors - for a rated voltage of at least 6 V, resistors - MLT-0,125, MLT-0,25.

The details of the device, except for the dynamic head, are mounted on a printed circuit board (Fig. 2) made of one-sided foil fiberglass, which, together with the head, is placed in a finished or self-made case. The dashed lines on the board drawing indicate the wire (in isolation) jumpers.

The supply voltage is supplied to the device through the bell button. The power source can be a battery made up of three series-connected galvanic cells with a voltage of 1,5 V. A somewhat worse option is a power supply unit, which must always be connected to the network.

Literature

1. Lyalyakin S, Tyulin V. Melodic automaton. - Radio, 1990, No. 2, p. 82-84.
2. Electronic calls for every taste. - Radio, 1995, No. 7, p. 33-35.

Author: M. Boyko, Kineshma, Ivanovo region

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