Importance

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Abstract

A wide-band programmable tachometer and speedometer/odometer apparatus to detect the rotational speed of an output shaft of an engine in a vehicle and calculate the corresponding speed/mileage thereof. First, a converting device converts a mechanical motion of an engine into an electrical signal. Second, the electrical signal is amplified by two amplifiers and outputted as an amplified signal. Third, the amplified signal is sent to a frequency divider and then through a multiplexer. A selecting device is incorporated with the multiplexer to send out a signal with frequency in an operable range. An F-V converter is used to convert the signal from the multiplexer and to output a first, a second, and a third DC voltage. The second and the third DC voltages are used to drive a tachometer to display the rpm of an engine. The third DC voltage is sent to a V-F converter and through a monostable circuit unit and outputted as positive pulses. The positive pulses are sent to an speedometer/odometer counter to obtain a corresponding mileage.

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First Claim