Warning device

Details Warning device Warning device

1975-01-22

1976-01-13

Yusko, Donald J.

Communications: electrical

Systems

Call station

307232, G08B 1710, H03K 520

Patent

active

039328503

ABSTRACT:
An improved warning device having means for sensing or detecting a predetermined danger or phenomenon has a compensation circuit for the sensing means, including compensating means connected to the sensing means, amplifier means connected to the junction of the sensing and compensating means, and a feed-back circuit connected to the output of the amplifier means and the input of the compensating means for maintaining the output voltage of the amplifier means substantially constant despite slowly occurring changes in the voltage drop across the sensing means. Means, such as a resistance-capacitance network, is provided in the feedback circuit for rendering the amplifier means non-responsive to slowly occurring changes in the voltage drop across the sensing means and for maintaining the amplifier means responsive to rapidly occurring changes in the voltage drop across the sensing means, as occurs in the presence of the danger or phenomenon to be detected.

REFERENCES:
patent: 3516083 (1970-06-01), Meyer
patent: 3548205 (1970-12-01), Ogden
patent: 3611335 (1971-10-01), Ogden et al.
patent: 3876999 (1975-04-01), Lee
patent: 3879718 (1975-04-01), Roberts

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