Tachometer circuit

Details Tachometer circuit Tachometer circuit

1976-10-21

1978-06-13

Demeo, Palmer C.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324 16R, G01R 1342

Patent

active

040951782

ABSTRACT:
The disclosure describes an improved tachometer for displaying the speed of an engine which produces ignition pulses. The tachometer includes a pulse-forming circuit, a meter, and a capacitor connected in series with the meter. A rectifier enables the transmission of a current pulse through the capacitor and meter in response to each timing pulse. A discharge device momentarily interconnects the opposed plates of the capacitor in response to the terminal of each timing pulse, whereby the voltage on the capacitor is dissipated. The meter indicates the speed of the engine by responding to the frequency of the current pulses. The discharge device includes a diode and transistor connected across the capacitor.

REFERENCES:
patent: 3369178 (1968-02-01), Wilson
patent: 3473119 (1969-10-01), Mazurkevics
patent: 3559063 (1971-01-01), Galletti
patent: 3572302 (1971-03-01), Wollesen
patent: 3588698 (1971-06-01), Ashcraft

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