Rear light control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Rear light control. 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 described device is designed for installation on a motorcycle or scooter and is intended to signal the driver about the serviceability of the rear red light lamp at night or about the burnout of this lamp, which is fraught with a traffic accident in the form of a rear collision.

The schematic diagram of the device is shown in the figure.

Rear light monitoring

Diode VD1 is connected in series with the rear lamp EL1. When the lamp is turned on with the SA1 toggle switch, the lamp current, passing through the diode, creates a voltage drop across it, which is enough to unlock the transistor VT1 and put it into saturation. Due to this, the bases of both transistors VT2 and VT3 are connected to a common bus. As a result, the transistor VT2 is closed, and VT3 opens, providing its emitter current with the glow of the green LED HL1. Resistor R2 limits the current of the LED to the allowable one.

When the tail lamp burns out, there is no current through the diode VD1, the transistor VT1 is locked, as a result of which the base current of the transistor VT1 flows through the resistor R2, with which it is unlocked. The emitter current VT2 lights up the red LED HL2. Resistor R3 limits the LED current. In this case, the HL1 LED is off, since it is shunted by an open transistor VT2.

A printed circuit board with the arrangement of circuit elements on it is shown in the figure.

Rear light monitoring

As transistors VT1 and VT2, you can use KT315, and as VT3 - KT361 with any letter index. The resistances of resistors R2 and R3 are selected during adjustment to obtain sufficient brightness of the LEDs.

Author: Prokoptsev Yu.

See other articles Section Automobile. Electronic devices.

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