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Automotive Speed Indicator(1N4001)

2017-08-11 02:24  
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This article briefly describes the Automotive Speed Indicator (1N4001). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: 1N4001.

The speed of an automobile can be indicated by detecting the pulses generated by the ignition system and causing anLEDto light. The circuit utilizes a quadNORgate IC chip. Two of the gates are configured as a one shot multivibrator which produces a fixed duration pulse each time the primary circuit of the automobile ignition system opens the circuit to the ignition coil. The other 2 gates are used as buffers which provide an accurate rectangle pulse.


Figure 1 

As the number of pulses per second increases, the voltage fed to the base of of theNPNtransistor becomes high enough to cause it to conduct and turn on theLED. The speed at which theLEDlights is set by R4. The input of the circuit is connected to the distributor side of the ignition coil or to the tachometer connection on those cars that are equipped with electronic ignition.



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