Light beacon for pets. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Walking with a dog in the dark, it is quite difficult to track all its movements, which is why the idea came up to make a light beacon on LEDs placed on the dog's collar.
The schematic diagram of the device is shown in fig. 1. It consists of two pulse generators. The first is made on the logic elements DD1.1 and DD1.2 of the digital microcircuit DD1, the second - on the elements DD1.3 and DD1.4. The first generator generates pulses with a duration of about 3 s and a pause of about 6 s. During the action of the pulse, a high logic voltage level is present at pin 8 of the DD1.3 element, and the second generator, which has a higher pulse repetition rate, is switched on. At pin 11 of the DD1.4 element, a series of pulses is formed, which, through the transistor VT1, turns on the LEDs HL1 - HL5. Thus, series of short light flashes are obtained for 3 s with a pause between them of 6 s.
In the beacon, you can use various parts, the main thing is that they be small in size. As a power battery, three small-sized galvanic cells (diameter 12, length 30 mm) with a voltage of 1,5 V are used. It is even more convenient to use small-sized batteries. Any small-sized power switch is suitable, for example, PD-9-1.
The device is mounted on a board (Fig. 2) made of one-sided foil fiberglass. There are no holes in the board - the parts are soldered with leads directly to the pads. The whole structure is placed in a housing attached to the bottom of the collar, and the HL1-HL5 LEDs are distributed evenly around its perimeter.
Establishing the device is reduced to the selection of resistors R1, R2 and R3. At the same time, the desired ratio of the frequency of flashes, the duration of a series of flashes and the pause between them is achieved.
Author: P. Kiselev, St. Petersburg
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