G - Physics – 01 – R
Patent
G - Physics
01
R
340/161, 340/77
G01R 19/04 (2006.01) G01R 19/165 (2006.01) H02J 7/14 (2006.01) H03K 3/023 (2006.01)
Patent
CA 1041627
BI-LEVEL CONDITION MONITOR USING REVERSE-BIASED CONTROL DIODES Abstract of the Disclosure An integrated circuit timer connected for astable oscillation in response to the charging of a timing capaci- tor to the threshold level of the timer, the timer energizing an indicator light when in oscillation. A current bypass path with a diode therein is connected across the capacitor, the diode being reverse-biased to limit the level to which the capacitor may charge. A condition-responsive voltage, proportioned to and variable with the level of a monitored condition, is used to maintain the reverse bias of the diode at a level below the threshold level of the timer and thereby prevent oscillation of the timer when the condition is on one side of a predetermined level, and used to maintain the reverse bias of the diode at a level above the timer threshold so the timer may oscillate when the con dition is on the other side of the predetermined level. Two such timers are used when two predetermined levels of the condition are to be detected, and the timers may be set into oscillation in response to rising or falling changes in the monitored condition.
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