Flashing red light. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Professional drivers are well aware of how important it is to identify yourself on the road during an emergency stop, especially at night. After all, an unnoticed obstacle on the road very often leads to irreparable and tragic consequences.
The rules of the road stipulate that in the event of an emergency stop, the driver must put up an emergency stop sign at a distance of several meters from his vehicle. But very often this sign is blown away by a sudden gust of wind, or it is simply not noticed in bad weather or at night.
In order to properly protect themselves, drivers should play it safe and use a flashing red light in conjunction with an emergency stop sign. Unlike the sign, the lantern is very clearly visible at a distance of several hundred meters, and at night its visibility only improves. How to make such a lantern from the most accessible and inexpensive parts is described in this article.
The flashing light circuit consists of two transistors, one diode, two capacitors and three resistors. Resistors must have a dissipation power of at least 0,125 watts. The elements indicated in the diagram can be replaced with equivalent ones. A distinctive feature of the circuit is its simplicity and the way it is turned on. The fact is that, unlike common multivibrator circuits, it uses not parallel, but serial switching of a multivibrator with a load, which is used as a 12 V car incandescent lamp.
The scheme works as follows. When power is applied, the charge of the capacitor C2 begins through the resistor R3. Transistor VT1 during the charge C2 potential on the base is not enough to open, and it is closed, locking the transistor VT2. As C2 charges, the voltage across it reaches the unlocking threshold VT1, the latter opens and opens the transistor VT2 with its current. Current flows through the lamp and it glows. The open transistor VT2 discharges the capacitor C2 with the control current VT1. When the voltage on this capacitor drops below the opening threshold VT1, the circuit returns to its original state when both transistors are closed. Then the process is repeated.
You can make such a flashing lantern on the basis of an ordinary flashlight. To do this, the flashlight is replaced with a car bulb (12 V), with a power of not more than 5 watts. The inner side of the protective glass of the flashlight is painted red. To do this, you can use a paste from a red rod for a ballpoint pen. Instead of batteries, the multivibrator circuit assembled on the breadboard is placed in the power compartment. To fix the board, you can use a piece of porous rubber or foam rubber. The light bulb and the board are connected by insulated wires. The flashlight switch can be omitted, since the red light will turn on instead of the cigarette lighter. A pair of wires about 3 m long is soldered to the assembled circuit, at the end of which a purchased connector for the cigarette lighter is soldered. The center pin of this connector must be connected to the "+" of the circuit, and the side spring leads to the light bulb.
It is possible to use a flashing red lamp in a passenger car without removing the lamp from the passenger compartment, by directing a stream of flashing light through the rear window of the car. The light of this lantern will warn the approaching transport about an obstacle in its path in time.
Author: O.Valpa
See other articles Section Automobile. Electronic devices.
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