Call for utilities. Encyclopedia of radio electronics and electrical engineering

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

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It is known that apartment calls, working on the principle of "telegraph alphabet", cause a lot of inconvenience to residents of communal apartments and acquaintances who come to them. It is easy to get rid of this disadvantage by installing an electric musical bell. One has only to take as a basis the device described by G. Shulgin (see "Radio" No. 8, 1987), add a few nodes to it - and a melodious call to several rooms is ready.

Schematic diagram of an electromusical bell is shown in fig. 1. It is designed for four rooms of a communal apartment and is controlled by four buttons (SB1-SB4). When you click on each of them, its own melody sounds.

(click to enlarge)

This device works as follows. When the supply voltage is applied, the node on the elements DD2.1. vr2. R3. R4. C2 resets the counter DD3. The signal coming from the emitter VT2 to the input E of the DD4 chip. briefly translates its outputs into a high-impedance state, and as a result, a log level appears at the free inputs of the DD2.2 element. 1. Log. 0 from the output of this element is fed to one of the inputs of the element DD1.3 and prohibits the passage of pulses from the generator on the elements DD1.1, DD1.2 and the transistor VT1 to the counter DD3. When you press one of the buttons SB1-SB4, one of the triggers of the DD4 chip switches and a log level appears at the corresponding input of the DD2.2 element. 0. As a result, the lot level will be set at the output of this element. 1. which will allow the passage of generator pulses to the counter DD3. The counter starts to recalculate the least significant digits of the PROM on the DD5 chip. on the highest digits of which, depending on the pressed button, the code of one of the blocks 0111, 1011, 1101 or 1110 is set. These codes are used in the call.

Each melody consists of fourteen notes. The playback speed, if desired, is selected by the resistor R2. The last table code (1111) sets the log level at pin 17 of the DD6 decoder. 0. The DDI.4 element inverts this level to the log level. 1. which is fed simultaneously to all inputs S triggers DD4. returning them to their original state. log level. 0. appearing at the same time at the output of the element DD2.2. again prohibits the passage of generator pulses to the counter DD3. Capacitors C6 - C9 eliminate interference from the mains wires to the inputs R of flip-flops DD4 and thus prevent its false positives.

The version of the "firmware" of the PROM is shown in Table. 1 (address pins - 4, 7, 6, 5, block pins - 15, 1, 2, 3. code pins - 9, 10, 11, 12), and the map of correspondence between notes and codes is in table. 2. The programming of the K556RT4 chip is described in detail in [1].

(click to enlarge)

As can be seen from Table. 1, the capabilities of the K556RT4 PROM in this device are far from being fully implemented - only the cells in blocks 0111. 1011, 1101. 1110 are flashed. the rest of the blocks. I recommend flashing all the older cells of unused blocks with the code 1111. Because if this is not done, then if you accidentally press two buttons, the call will loop, endlessly going through the empty block without finding the stop code

The device can use MLT-0.125 resistors and any capacitors that are suitable in size. The K155LA7 chip is interchangeable with K155LA1 or K155LA6. As VD1-VD14, any small-sized KD521 diodes are suitable. KD522, KD510. D 2. D9 and others. The R9 - R22 matrix is ​​composed of MLT-0.125 resistors soldered vertically into the bell board, but other options for its implementation are also possible [2 - 4].

The bell is assembled on a printed circuit board made of double-sided fiberglass with dimensions 100x60 (Fig. 2). All parts are installed on the board, except for the network transformer, which can be made independently or taken ready-made with a voltage on the secondary winding of 8 ... 10 V. The parametric stabilizer KR142EN5A has built-in protection against thermal breakdown, but it will not be superfluous to attach a small heat sink to it.

(click to enlarge)

The connection of the board to the buttons is best done with a five-core shielded wire. The screen should be soldered to the area provided for this on the part installation side. The design of the call buttons is not critical and depends on the capabilities of the radio amateur.

After programming, the PROM should be soldered to the board, but if a socket is soldered to the place of its installation, it will be possible to change "bored" melodies. To simplify the call, instead of the K155IDZ chip, you can use the K155ID1, but in this case, the device's capabilities will be reduced to a set of nine notes.

The tuning of the tone generator and checking the operation of the counter and decoder are described in detail in [2].

Literature

1. Nazarov N. Programmer for microcircuits K556RT4: Sat: "To help the radio amateur", vol. 83. p. 26. - M.: DOSAAF. 1983.
2. Shulgin G. Electromusical bell. - Radio. 1987. No. 8. p. 54.55.
3. Cherevatenko V., Cherevatenko A. Programmable musical bell-automator. 103. p. 52-54. - M.: DOSAAF. 1989.
4. Hook A. Electromusical bell. - Radio. 1988. No. 12. p. 55.

Author: D. Kostetsky, Kamen-on-Obi, Altai Territory

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