Build Your Own Audio Analyzer Circuit Diagram

Description

This analyzer represents a perceptive device, monitoring variations in the frequency and bandwidth of an acoustic waveform. Consequently, the luminance of the LED that activates momentarily is proportional to the signal’s bandwidth, while the hue is correspondingly linked to the frequency. The circuit’s input sensitivity is controlled by R2, ensuring that the red LED illuminates during high-power signals, the yellow LED glows in the middle range, and the green LED activates with low-intensity signals. The display unit comprises three lines containing ten LEDs each, which are validated by a counter decoder (IC2). Two gates, ICα-b, function as the IC2, with R6 regulating the signal frequency. When no input signal is present, none of the LEDs will illuminate. Upon the application of a signal, the LEDs will begin to flash, driven by the rhythm and strength of the signal. Experimentation with the values of resistors R4, R5, is encouraged to determine the optimal configuration for individual preferences. Initially, these components can be implemented as trimmers with a 1KΩ rating, and subsequently, they can be permanently replaced with fixed resistance values. Further modification includes the addition of additional LEDs, utilizing the same IC2.

IC2 - 4017

The 4017 is a versatile decade counter IC. It’s a widely utilized integrated circuit that performs as a binary counter, counting from zero to ninety-nine. This device’s primary function is to generate a sequential count, outputting a different decimal value at each clock pulse. The 4017 typically consists of five JK flip-flops, enabling it to count up or down depending on the input signals. It’s frequently found in digital circuits, automation systems, and educational projects. Its flexibility and low cost make it an excellent choice for various counting and timing applications.

IC1 - LM3915

The LM3915 is a precision integrated circuit designed for detecting and measuring low-level analog signals. Specifically, it's an amplifier designed to amplify weak analog signals, making them suitable for audio or sensor applications. This IC incorporates a high-gain operational amplifier within a single package, providing a convenient solution for amplifying signals with minimal external components. It is frequently used in applications such as microphone amplification, where the input signal is often weak. It's commonly used in instrumentation and control systems where accurate amplification is crucial.

IC3 - 4011

The 4011 is a versatile decade counter integrated circuit. It is a 10-stage binary counter, commonly employed in digital logic and counting applications. This IC generates a sequential count from 0 to 99, with each stage representing a binary digit (bit). The 4011 typically consists of five JK flip-flops, enabling it to count up or down depending on the input signals. It’s frequently found in digital circuits, automation systems, and educational projects. Its flexibility and low cost make it an excellent choice for various counting and timing applications.

Circuit diagram

Parts list