Audible Logic Tester Circuit Explained
A step-by-step guide to understanding how this simple circuit works with this audible logic tester.
Introduction:
An audible logic tester is a simple electronic circuit that can be used to test the logic levels of digital signals. It works by producing a different audible tone for each logic level. This makes it easy to quickly and easily identify the logic level of a signal, even if you don't have a logic analyzer or oscilloscope.
Components for audible logic tester
The audible logic tester circuit is made up of the following components:
- 4 x LM339 quad comparators
- 4 x 4011 quad NOR gates
- 4 x 2N3904 NPN transistors
- 4 x 100KΩ resistors
- 4 x 50KΩ resistors
- 4 x 1KΩ resistors
- 4 x 0.1μF capacitors
- 80Ω speaker
- 12V power supply
Wiring of the circuit.
The wiring of the audible logic tester circuit is shown in the diagram below.
[Refer the given circuit above.]
The LM339 quad comparators are used to compare the input signal to the reference voltage of 1.2V. The 4011 quad NOR gates are used to invert the output of the comparators. The 2N3904 NPN transistors are used to amplify the output of the NOR gates. The 100KΩ resistors are used to bias the comparators. The 50KΩ resistors are used to set the threshold voltage of the comparators. The 1KΩ resistors are used to bias the NOR gates. The 0.1μF capacitors are used to filter out noise. The speaker is connected to the output of the amplifier. The 12V power supply provides power to the circuit.
Operation of the audible logic tester circuit.
When the input signal is at a logic level of 0V, the comparators output a logic level of 1. The NOR gates invert this output, so the output of the amplifier is a logic level of 0V. This causes the speaker to produce a low-pitched tone.
When the input signal is at a logic level of 5V, the comparators output a logic level of 0. The NOR gates invert this output, so the output of the amplifier is a logic level of 5V. This causes the speaker to produce a high-pitched tone.
If the input signal is at any other logic level, the output of the comparators will be somewhere between 0V and 5V. This will cause the output of the amplifier to be somewhere between 0V and 5V, which will produce a tone of intermediate pitch.
Conclusion:
The audible logic tester circuit is a simple and easy-to-build circuit that can be used to test the logic levels of digital signals. It is a useful tool for anyone who works with digital electronics.
Additional Information:
- The audible logic tester circuit can be used to test the logic levels of both TTL and CMOS signals.
- The audible logic tester circuit can be used to test the logic levels of signals from a variety of sources, such as logic gates, microcontrollers, and sensors.
- The audible logic tester circuit can be used to test the logic levels of signals in both the positive and negative voltage domains.
I hope this blog post has helped you to understand how the audible logic tester circuit works.
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