Wired remote control. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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This device can be used to select the operating mode of a tape recorder or a TV program using a remote control, to control household automation, etc. The important advantages of the system include the fact that two wires are enough for connecting to the block of actuating units, regardless of the number of channels management.
In the described form, the device should be considered as the basis of the control system. So, for example, nodes for matching the outputs of digital meters with executive relays, methods for increasing the number of channels, etc. are not covered here. Toggle switches, pushbutton switches, contactors of calculators and TV control panels can be used to issue commands, depending on the specific purpose of the system.
The device (see diagram) is structurally divided into two parts - command and executive. In the command part (it is circled with a dash-dotted line), a clock generator is assembled on the elements DD2.2, DD2.3, a command encoder is assembled on the counter DD1 and buttons SB1-SB10. Counter DD3 in the executive part serves as a command decoder.
When power is applied, the R1C1 (C3R4) circuit generates a pulse that resets the counter DD1 (DD3). As shown in the diagram, both meters are connected to a common power source, while the number of conductors in the cable connecting both parts of the device is three. If the command part is powered from an individual battery of cells, the required number of conductors in the cable is reduced to two.
After zeroing, the output 0 of the counters DD1 and DD3 will appear high, and the remaining nine - low. At the input of the blocking element DD2.1 - high level, at the output - low. Therefore, the clock generator is inhibited. In this state of the device, the load connected to output 0 of the counter DD3 is turned on, the rest of the loads are turned off.
If you press the command button SB6, for example (in the output circuit 5 of the counter DD1), the high level at the input of the blocking element DD2.1 will change to low. The generator will start to work, and its pulses through the second blocking element DD2.4 will freely pass to the CN input of the counters DD1 and DD3. Each pulse of the generator will increase the state of the counters by one, while a high level will sequentially appear on their outputs 1,2, 3, etc.
As soon as a high level appears at the output of 5 counters, the element DD2.1 switches to the zero state and blocks the generator. In this position, the device can remain indefinitely. Element DD2.4 plays the role of a buffer and at the same time provides a high level at its output after the generator is blocked, regardless of the position in which the generator was blocked.
If you now press the button with a larger number, the generator will start working again and after the counters have reached the state corresponding to the pressed button, it will stop again. When you press the SB1 button, the counters will work until they overflow and the generator will be blocked in their zero (initial) state. The device is not afraid of erroneous simultaneous pressing of two buttons - the command of the button with a lower number will work.
As already noted, a high level, before finally appearing at one or another output of the counter DD3, "passes" in turn all the intermediate outputs. In this case, however, the loads connected to them (relays or electromagnets), as a rule, do not have time to operate, since the generator frequency is very high - about 500 kHz. In other words, the duration of single pulses at the intermediate outputs of the counter does not exceed 2 μs. If the loads are too fast, slow down RC circuits should be provided in the matching nodes.
In the device, in addition to those indicated in the diagram, microcircuits of the K176, K564, KR1561 series can be used.
Author: S. Lyapunov, Nizhny Tagil, Sverdlovsk region
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