The idea behind Edison in his telegraphic alarm clock, a widely used at present in so-called code converters. Only now with the cam grooves is called the code disk. Telegraph alarm Edison can help out, and you guys, especially in war games.

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Where required at regular intervals apply Morse code any team or their call signs, machine will replace the "fighter". But the main thing is not the point. Automaton with a rigid program, always in a reliable person, and certainly never "go to sleep." Assume that your team calls "pine" and send it to every quarter of an hour. What will be the transmitter of commands that do not play any role? This can be either a radio transmitter, or transmitter of light commands, or any other yet.

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Automatically running a telegraph key will be to manage operation of the transmitter - and turn it off, adhering strictly to a given program. Start making machine should be a compilation of the program. Set the call sign "pine" in Morse code and make a provisional timetable for the transmitter that is when he is on and when turned off. The necessary data for the duration of parcels dots and dashes, and intervals between them, take the description of the telegraph alarm Edison. The resulting schedule put on a sheet of paper in the cellular scale, so that 1 / 8 to match the same cell (5 mm). As a result, you should get a graph. This is a program of the transmitter in the transmission of the word "pine". The total duration of parcels equal to 6. If we now make the resulting graph to the circumference of the disc diameter of 76 mm, it is easy to make a profile drawing code disc, which determines the work program of the machine.

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The shaded areas correspond to the projections of graphics on the disc, the intervals - basins. The disc can be manufactured from sheet getinaks, PCB or Plexiglas thickness of 3-4 mm. When you rotate the code disk counterclockwise at a speed of one revolution in six seconds, the contact pair repeats the recorded program. When the ledge came against the contact pair, the circuit of the transmitter is turned on. Once a contact plate is hollow, opens the circuit and the transmitter off.