Electronic voltmeter

Details Electronic voltmeter Electronic voltmeter

1975-07-08

1977-01-18

Demeo, Palmer C.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Demand, excess, maximum or minimum

324 96, 324122, G01R 1916, G01R 1302

Patent

active

040042200

ABSTRACT:
This electronic voltmeter is particularly suited to develop volume unit output readings for appliance type electronic equipment. Seven operational amplifiers are used to selectively and separately energize seven light emitting diodes. Each of the operational amplifiers is provided a reference voltage. Additionally, each operational amplifier is supplied a voltage proportional to the peak voltage of the signal from the electronic equipment. The reference voltage and the voltage proportional to the peak signal from the equipment are compared by each operational amplifier. The operational amplifiers are sequentially switched as the level of the peak signal from the equipment increases. Six of the seven light emitting diodes are energized through transistors. The transistors coact with the operational amplifiers to extinguish all but one light emitting diode. Accordingly, only a single light emitting diode is energized at any time.

REFERENCES:
patent: 2486890 (1949-11-01), Stanmyre
patent: 2884085 (1959-04-01), VON Wittern et al.
patent: 3383594 (1968-05-01), Fiorletta et al.
patent: 3818495 (1974-06-01), Sagara et al.

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