G - Physics – 01 – R
Patent
G - Physics
01
R
324/58
G01R 19/165 (2006.01) G01R 19/155 (2006.01) G08B 21/20 (2006.01)
Patent
CA 1239993
ABSTRACT OF THE INVENTION A micropower DC voltage indicator is provided that is a two terminal device with a very high input impedance. An oscillator circuit is provided by a series of inverters, such as metal-oxide semiconductors (MOS) with the power inputs connected in parallel. A suitable RC circuit connects the output of one MOS inverter to the input of another MOS inverter, otherwise the output of each MOS inverter connects directly to the input of the next MOS inverter. Across one of the MOS inverters is connected a liquid crystal display which indicates if a DC voltage within a specific range is applied to the two terminals of the DC voltage indicator. The two terminal inputs to the oscillator circuit have a very high impedance and operate over a fairly broad DC voltage range.
516950
Ridout & Maybee Llp
Southwest Research Institute
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