Reverse gear indicator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Reverse gear indicator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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The device consists of two generators connected in series by a signal. The first of them is assembled on logical elements DD1.1-DD1.3 (see diagram in Fig. 1). It generates rectangular pulses with a high level duration of 0,45 s, and a low level of 0,55 s.

Reverse gear indicator

The output signal of this generator controls the operation of the second generator, made on the elements DD1.4-DD1.6. At a high level at the output of the first generator, the second one is inhibited; when the levels change, the second generator begins to form a sequence of rectangular pulses with a frequency of about 400 Hz.

On the transistor VT1, a current amplifier is assembled, loaded with a dynamic head BF1.

In the car, the device is connected in parallel with the lamp signaling the reverse gear. Immediately after power is applied, the signaling device starts to reproduce sound pulses.

All parts, except for the dynamic head, are mounted on a printed circuit board made of foil fiberglass 1 mm thick. The board drawing is shown in fig. 2. Together with the head, it is placed in a strong metal or plastic box, fixed in the trunk of a car.

Reverse gear indicator

It is desirable to cover the finished board with a waterproof varnish - this will reduce the dependence of the signaling device on dust and moisture.

Author: I.Zabelin, Moscow

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