Tachometer system for engine having battery or magneto powered i

Details Tachometer system for engine having battery or magneto powered i Tachometer system for engine having battery or magneto powered i

1990-03-30

1992-04-28

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

324166, G01P 342, G01P 348, G01P 354

Patent

active

051091917

ABSTRACT:
Two embodiments of tachometers for engines that are capable of use with an engine that either has an external source of electrical power such as a battery or no external source of power. In one embodiment, the switching is accomplished manually and in another embodiment the switching is accomplished automatically whenever battery power is applied to the tachometer. A constant voltage system reduces noise generated by this system.

REFERENCES:
patent: 3881094 (1975-04-01), Taylor et al
patent: 4127812 (1978-11-01), Baliquet
patent: 4486759 (1984-12-01), Toyomura

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