Micropower DC voltage indicator

Details Micropower DC voltage indicator Micropower DC voltage indicator

1985-10-21

1986-09-30

Ruehl, Charles A.

Communications: electrical

Condition responsive indicating system

Specific condition

331108D, 331DIG3, 340663, 340765, G08B 2100, G09G 318, H03B 512

Patent

active

046149406

ABSTRACT:
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.

REFERENCES:
patent: 3503062 (1970-03-01), Witzke et al.
patent: 3550105 (1970-12-01), DeCola et al.
patent: 3575492 (1971-04-01), Nester et al.
patent: 3832629 (1974-08-01), Cernek, Jr.
patent: 4479118 (1984-10-01), Cole, Jr.
Electronic Engineering (Feb. 1982), "Temperature Compensation in CMOS Oscillators", by Ward et al., p. 25.

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