Title: Voltage-change detecting circuit and input device of alarm thereof
Application Number: 97106664 Application Date: 1997.10.17
Publication Number: 1201147 Publication Date: 1998.12.09
Approval Pub. Date: Granted Pub. Date: 2002.01.09
International Classifi-cation: G01R19/00,G08B13/00
Applicant(s) Name: Zhang Hui Address: 314000
Inventor(s) Name:
Attorney & Agent: sun jiafeng
Abstract:
     The voltage fluctuation detection circuit includes operation amplifiers A1 and A2, divider resistors R1, R2, R3, R4 and R5 and capacitor C1. When the voltage of input end is raised to a sufficient value or reduced to a sufficient value, the output end outputs a negative triggering signal, then it can be restored to initial state after the capacitor is charged. The on-and-off sensor is series-connected with a resistor, and is parallel-connected with divider resistor R1, an alarm input device can be formed.
Time: 6