High speed warning device

  
A1 amplifies and regulates the signal from the spark coil. A2 converts frequency to voltage so that its output is a voltage proportional to engine rpm. A3 compares the tachometer voltage with the reference voltage and turns on the output transistor at the set speed
High speed warning device - schematic

Amplifier A4 is used to generate an audible tone whenever the set speed is exceeded.




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