Voltage level indicator established by a series of progressively

Details Voltage level indicator established by a series of progressively Voltage level indicator established by a series of progressively

1975-02-07

1976-07-13

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Nonquantitative

324122, 340378R, G01R 1916

Patent

active

039696723

ABSTRACT:
This invention relates to a voltage level detector having a string of series coupled light emitting elements, such as light emitting diodes or low voltage lamps, as indicating devices. The light emitting diodes are series coupled to a constant current source. Parallel to each of the light emitting diodes is the emitter-collector path of a transistor connected. The base electrodes of the transistors are connected to the point with the voltage level to be detected through base resistors. When a transistor is in its conductive state the parallel coupled light emitting diode is by-passed and when a transistor is blocked current is diverted through the parallel coupled light emitting diode which then becomes lit. Since the transistors are series coupled and have their base electrodes connected to the same voltage level point the more the transistors become successively blocked and accordingly their parallel coupled light emitting diodes become successively lit the higher is the voltage between the collector of the end transistor and the voltage level point.

REFERENCES:
patent: 2817815 (1957-12-01), Evans
patent: 3351928 (1967-11-01), Smola
patent: 3740644 (1973-06-01), Schag et al.
patent: 3795863 (1974-03-01), Umeda et al.
patent: 3796951 (1974-03-01), Joseph

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