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5532P voltage comparator

Overview

Use one of the NE5532 operational amplifiers as a voltage comparator and the other operational amplifier as a voltage follower to drive the indication LED.

The design takes into account both debugging and long-term use. Precision potentiometers can be used during debugging (the hand-tightened version is recommended, as shown in the picture above)

When it needs to be placed in a device for use, you can select an appropriate resistor label based on the calculated or measured resistance value (from a precision potentiometer) and fix the comparison voltage.

This is a set of test photos. The reference voltage is 3.3v. The input comparison voltage is lower than the set value. There is no output and the indicator light is off.

When the input voltage is higher than the reference voltage, the module outputs high level and the indicator light turns on.

The pin header is affixed, the module interface adopts fool-proof design, and the IO function is marked for easy use.

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:2025-07-02 21:58:25

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