Signaling device. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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In our daily life, there are procedures that are not difficult to perform, but their monotony causes inconvenience in their implementation. These include cyclically repeated from day to day signaling at exactly the specified time (for example, making calls in educational institutions). Such processes themselves "ask" to automate them. The author of this design not only solved this problem, but also provided for various options for its implementation.

The proposed device allows, in accordance with any of the 16 pre-programmed schedule options, to turn on the sound signal for 6...8 s in the time interval from 4:00 to 19:55.

The alarm device consists of an electronic clock, a programmer and a power source. The electronic clock (Fig. 1) is assembled on the well-known K176IE18 (DD1), K176IE13 (DD2) microcircuits. K176IDZ (DD3). Their typical inclusion and functioning are considered in detail in [1, 2]. The current time is displayed by the HG1 indicator (IVL1-7/5).

(click to enlarge)

Schematic diagram of the programmer is shown in fig. 2. Chips DD4.1, DD5. DD6 form a register, the outputs of which form an eight-bit code of the current time. The information inputs of these microcircuits in the code 1-2-4-8 are supplied with current time signals from the outputs of the electronic clock microcircuit DD2. At the moment the signals of tens of hours appear, the signal T4.1 from the output (pin 4) of the DD15 microcircuit arrives at the input C of the DD1 element with a slight delay in the leading edge. As a result, the code of tens of hours is set at the output of element DD4.1.

Similarly, on the leading edge of the signals TK, T2, coming from the outputs of the DD1 microcircuit to the inputs of the DD5, DD6 microcircuits, the codes of units of hours and tens of minutes, respectively, are set at the outputs of the latter. For example, at the current time of 08:30, the code 00001110 will be set at the register outputs, which will not change for 10 minutes. Thus, dynamic information about the current time generated by the DD1, DD2 microcircuits for display on the HG1 indicator, r register on the DD4.1 microcircuits. DD5 and DD6 converted to static

At the moment the T1 signal arrives at the input of the programmer, the code of units of minutes is set at the output of the decoder DD7. If the number of units of minutes is 0 or 5, a log signal will be generated at pins 3 and 6 of the DD7 chip, respectively. 1. For example, at the current time of 08 h 30 min at the address inputs A0-A9 of the PROM DD8, a ten-bit code 1 will be set on the leading edge of the T0000111010 signal. 8.

The event that has occurred is remembered by the DD4.2 trigger on the rising edge of the T1 signal, which comes to its input C (pin 11) with a slight delay. log signal. 1 at the output of this microcircuit will be held for 1 min. On its leading edge, the circuit on the elements DD9.3, DD9.4 with a slight delay will generate a log signal at its output. 0 for at least 6 s. This signal is fed to the input of the amplifier, its transistors VT1, VT2 open, relay K1 is activated and its contacts K1.1 close the power supply circuit of the sounder for 6 s. Elements R26 and C10 create a delay in the leading edge of the signal from the output of the trigger DD4.2 for a time of at least 0.32 s.

The power supply of the signaling device (Fig. 3) provides stabilized voltages of +5 and -23 V. unstabilized -28 V and an alternating voltage of the indicator glow of 5 V. From the +5 V source, the signaling device consumes about 130 mA. from a source of -28 V (when relay K1 is on) - 90 mA. The filament circuit of the HG1 indicator draws 120 mA.

(click to enlarge)

All elements of the signaling device are located on one board. During installation, oxide capacitors K50-16 (C12-C14), tuning capacitors KT-21 (C2, C3) were used. KM-6 (others). All resistors are MLT. Buttons SB1 - SB3 and switches SA1, SA2 - any small. A network transformer with a power of 10 W - any one that provides the power indicated in Fig. 3 voltages. Relay K1 - RP21 for operating voltage 24 V.

The DD8 chip is installed on a separate block. It is programmed using a programmer, which can be performed according to a scheme similar to that published in [3].

Before programming, it is necessary to compile a table, in the first column of which write the time of the sound signal (schedule), in the second, third, fourth and fifth - the corresponding binary ten-digit code of this time, in the sixth - the position of the SA1 switch (log. 0. log. 1) . at which the device will work with the selected schedule, and in the seventh - the PROM output selected for programming. Earlier in the text and in the table given here, examples of translating the signaling time into a ten-bit binary code are given.

Since each of the eight positions of the SA2 switch has two positions of the SA1 switch, the total number of call schedule options implemented by this PROM is 16.

After programming, the DD8 chip is installed in the signaling device and the correctness of its programming is checked. To do this, the switches SA1 and SA2 are moved to the desired position and the buttons SB3 - correction, SB1 - setting the minutes, SB2 - setting the hours set the time 1 h 00 min on the HG00 indicator. Then, with the SB1 button, this time is again "driven" to 00 h 00 min. When running, relay K1 will operate loudly enough. The moments of its operation should be compared with the voiced feed table.

Schools schedule bells on weekdays and Saturdays. as a rule, they do not match, therefore, for the convenience of using the signaling device, such schedules are entered into the PROM for one output with different signals at the address input A10. Then the call schedule will be easy to select with the SA1 switch.

Literature

1. Alekseev S. Application of K176 microcircuits. - Radio. 1984. No. 5. With. 36-40; No. 6. p. 32-35.
2. Bannikov V. Electronic clock from the radio designer Effect-4 ". - Radio, 1993, No. 10. pp. 28-31.
3. Puzakov A. ROM in sports equipment. - Radio, 1982. No. 1, p. 22,23.

Author: N.Klemenov, Smolensk

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