Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1983-04-18
1986-03-11
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324435, 340636, G01N 2746
Patent
active
045756805
ABSTRACT:
A battery condition indicator and on-off relay circuit for electric guitars with on-board active electronics, adaptable to many other battery-operated appliances, includes an electronic relay circuit capable of disconnecting one or more batteries, under control of a pair of on-off contacts. A test interval timing circuit delays turnoff by about 10 seconds, during which a test of the battery (or batteries) is performed automatically under normal load by comparison to a precision reference voltage. Good battery condition is indicated by illumination of a light-emitting diode which may be located inside the guitar body, visible thru the opening of a standard audio output jack, which may include the on-off contacts, actuated by insertion or removal of the mating audio output plug. The circuit is particularly power-efficient to minimize battery drain.
REFERENCES:
patent: 3810144 (1974-05-01), Clouse
patent: 3879137 (1975-04-01), Sakazaki
patent: 3886443 (1975-05-01), Miyakawa
patent: 3997831 (1976-12-01), Hopfner
patent: 4028616 (1977-06-01), Stevens
patent: 4251811 (1981-02-01), Wittlinger
patent: 4338596 (1982-07-01), Huber
Eisenzopf Reinhard J.
McTaggart J. E.
O'Shea Kevin D.
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