The LEV evaluation circuit of μA741

Published:2011/5/26 23:10:00 Author:Borg | Keyword: LEV, evaluation circuit | From:SeekIC

This is a LEV evaluation circuit of μA741. When the input signal Ui is lower than IV, the LED1 is glowing; when the signal ranges 1~2V, the LED2 is glowing; when the signal is higher than 2V, the LED3 is glowing. As the circuitis installed with a calculating amplifier, so we can briefly evaluate the LED of weak signals. The reference voltage of U1 and U2 is provided by a voltage-steady diode. The EH of non-sensitive area is computed in the following way, i.eIn the formula, HOU and UOL are the maximum positive and negative voltages respectively of the computing amplifiers of A1 and A2.



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