Circuit arrangement for monitoring two operating voltages

Details Circuit arrangement for monitoring two operating voltages Circuit arrangement for monitoring two operating voltages

1990-04-05

1992-06-09

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340661, 340662, 340663, G08B 2100

Patent

active

051211084

ABSTRACT:
A circuit arrangement for monitoring two operating voltages of different polarity detects and indicates the deviation of either operating voltage from its nominal value beyond a predetermined tolerance limit. A transistor is provided, whose base is connected to the positive operating voltage across a first zener diode and to the negative operating voltage through a first resistor, and whose emitter is connected to the negative operating voltage through a series connection of a second zener diode and a second resistor, and to a reference potential across a diode.

REFERENCES:
patent: 3311907 (1967-03-01), Teal
patent: 3412392 (1968-11-01), Jenkins et al.
"Overvoltage/undervoltage Indicator . . . " Ideas for Design; Electronic Design vol. 28, No. 11 May 1980; Venkatasubbiah.

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