Simple voltage maintainer circuit

Published:2011/6/21 7:14:00 Author:TaoXi | Keyword: Simple, voltage maintainer | From:SeekIC

In the figure, the IC uses the general type integrated operational amplifier such as the UA741, and the operational amplifier is connected into the 1:1 voltage follower, the input impedance is very high, but the gain is 1, actually it plays the impedance transformation function. If you connected a capacitance C1 at the in-phase input port of IC, the C1 is called the test holding capacitor. When the test meter or test pen is connected with the test point, the voltage of test point charges the test holding capacitor C1, after about 1 second, the C1 is charged to the measured voltage. When the test meter or test pen is removed from the test point, C1 discharges through the input impedance of integrated operational amplifier.



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