Introduction
This experiment demonstrates how to use the LM3915 audio level meter IC to visually display the level of an audio signal using a series of LEDs.
Materials Required
- LM3915 Audio Level Meter IC
- LEDs
- Resistors
- Audio Signal Source
- Breadboard and jumper wires
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Circuit Diagram
The LM3915 IC is used to convert an audio signal into a series of LED displays that represent the amplitude of the audio signal.
Steps for the Experiment
- Connect the LM3915 IC to the breadboard.
- Connect the LEDs to the output pins of the IC.
- Feed an audio signal into the input pin of the IC.
- Observe the LEDs lighting up in response to the amplitude of the audio signal.
Explanation
The LM3915 uses the amplitude of the audio signal to control the brightness of the LEDs, providing a visual display of the signal strength.
Results and Observations
- The LEDs will vary in brightness or light up sequentially in response to changes in the audio signal's volume.
