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As shown in the figure below, this is a simple and user-friendly logic probe circuit designed for testing digital signals. The circuit mainly consists of a hex inverter CD4069 and an LED. It allows users to easily determine the logic state of a signal through the LED's illumination. In addition to visual feedback, the circuit can also include a buzzer for audio indication, making it more versatile for different testing environments. This type of logic probe is particularly useful for students and hobbyists who are learning digital electronics. The design is straightforward, making it easy to build and understand. Whether you're checking high or low voltage levels, the LED will light up accordingly, providing immediate and clear results. With its compact size and low power consumption, this logic probe is a handy tool for any electronics enthusiast. The circuit diagram is clearly presented, making it easy to follow for those with basic electronics knowledge. Overall, this device is a practical and efficient way to test digital circuits in real-time.