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Fully discrete μA741

Overview

The uA741 operational amplifier is built with all discrete components. The circuit uses a circuit of the original domestic LM741. The pins are led out using F3 solder tabs. Please refer to the manual for various parameters.

The unconnected pin 8 is omitted and can be used for external zero adjustment.

Demo video: https://www.bilibili.com/video/BV11q4y1U7Da

Note: The triangular version of 741 does not have a schematic diagram and BOM, so the parameters of the resistor, capacitor, and diode are in the compressed package. All N tubes are 2N3904, and all P tubes are 2N3906.

UA741s is a semi-SMD and semi-inline version of 741. It is small in size and can be plugged into the op amp holder using an adapter board; a zero-adjusting resistor is installed on the board.

AD741 is based on the internal circuit of Arnold Semiconductor's AD741. It uses twin transistors with stable parameters and the same small size; a zero-adjusting resistor is installed on the board.

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-23 04:05:01

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