For the rotation of the disk at a given speed (one turn in 6 s) best suited micro motor with gear. The required engine can be bought in a store that sells toys. It eats from a single battery and consumes about 100 mA. The limit load on the shaft 4.5 fuel.

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Motor speed strongly depends on the load, the speed drop as its increase. But this should not upset you, because in our case, the load does not exceed 1 fuel. At this speed varies from 35 to 40 rev / sec. Therefore, to obtain the desired speed of the code disk in one revolution in 6 s, the gear ratio must be equal to about 1:200. Fasten the motor and gearbox on a wooden stand. The axis of the disk hard coded link to the axle gear. Set the contact pair. For this purpose it is best suited contacts from the phone switch.

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Connect the motor to the battery from a flashlight in series with a resistor. If the disc rotation speed is significantly different from the desired, adjust the value of the resistor. With too rapid rotation of the resistor should be increased, and vice versa. Remember, no matter what a cybernetic model of whatever you do, even the most simple, setting it to produce better in part. This will dramatically reduce your overall production time of the device. Find fault in a single node machine and make an adjustment it is always much easier than when the structure is fully assembled. It may happen that a home-made will soon not one but several errors.

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Find them to be quite difficult to even an experienced supervisor. He must first break the device into separate nodes, demonstrate proper operation and only then proceed to test the machine as a whole. In addition, as a rule, no set-up and is not required. It is only necessary to carefully check the wiring connections between the nodes, whose work is no longer in doubt.