Stop signal under reliable control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Stop signal under reliable 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 figure shows a schematic diagram of a device that informs the driver that the brake light lamps are turned on when the car is braking.

Stop signal under reliable control

The control lamp, which is installed on the panel, will turn on, obviously, only if Ur2 - the voltage on the resistor R2 - exceeds Uots = 0,5...0,6 V - the cut-off voltage of the silicon transistor VT1.

With R2 = 0,3 Ohm and the total current in the brake light lamps I = 3,5 A (actually somewhat less due to the voltage drop across resistor R2) Ur2 = I R2@1 V, and in the base circuit emitter of transistor VT1, a current Ibe = (Ur2-Ures)/R1 = 0,02...0,025 A will appear.

And since the current gain of the KT816G transistor is h21e=25, the collector current Ik=Ibe·h21e=0,5...0,625 A that arises in it will provide power to the HL3 indicator lamp, also, of course, 12-volt.

Note that the HL3 warning lamp will not turn on if only one of the brake light lamps - HL1 or HL2 - fails. The voltage drop across resistor R2 in this case will be less than the cutoff voltage of transistor VT1.

See other articles Section Automobile. Electronic devices.

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Studies conducted by dermatologists from the University of Zurich Hospital (Switzerland) in collaboration with metallurgists have shown that coins of one and two euros, when they are held in a sweaty hand, emit a lot of nickel.

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