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Car Tachometer with 555 IC (1N960)

2015-02-06 16:45  
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This article describes the Car Tachometer with 555 IC (1N960). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: 1N960.

Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don’t receives any current for that part of the duty cycle after time-out. A visible indication of engine speed is provided by integration of the variable duty cycle by the meter movement. Here’s the circuit diagram:

Car Tachometer circuit schematic diagram



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