MSGEQ7 Audio Equalizer circuit

This circuit allows you to equalize the audio signals in ten bands. It uses low-cost op-amps to form a professional equalizer circuit. The heart of the design is a classical band-pass active filter. The U11 acts as an attenuator to...

Interpolating Scanner Circuit

This design is for an interpolating scanner, a circuit featuring multiple signal inputs, a control voltage input, and a signal output. The output selectively transitions between inputs, smoothly fading from one to the next as the control voltage increases. A...

Spectrum Analyzer Adapter for Oscilloscopes

The circuit illustrated in the schematic diagram is a straightforward spectrum analyzer adapter circuit designed for oscilloscopes. This circuit can be utilized for scanning or analyzing signals. The spectrum analyzer adapter circuit is engineered to enhance the capabilities of an oscilloscope,...

7 band audio graphic equalizer circuit

This circuit is for an audio equalizer that is commonly found in commercial products such as high-fidelity systems, car audio, and stage equipment; however, published circuits for these devices are quite rare. This design features equalizer bands. The circuit diagram...

Arduino Vocal Effects Box

This Arduino-powered vocal effects box pitch shifts and distorts incoming audio signals to produce a wide variety of vocal effects. This project is an experiment with real-time digital signal processing using Arduino. It samples an incoming microphone signal at a...

Audio Beat Detect ?« Electronic Product Design

This circuit employs a digital potentiometer to enable the microcontroller to automatically adjust the circuit's gain according to the ambient audio volume. However, a standard potentiometer can be used if automatic adjustment is unnecessary. The low-pass filter design is based...

Central-image-canceller

The circuit is designed to eliminate the vocal portion of an audio signal while preserving the instrumental portion. It achieves this by mixing two channels that are 180° out of phase, allowing the signals that create the center-stereo image to...

3 Channel Spectrum Analyzer

This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. The circuit will take line level...

Simple Spectrum Analyzer Adaptor For Scopes Circuit

This circuit is designed for monitoring an amateur band or a specific segment of the radio spectrum. It utilizes an NE602 mixer-oscillator chip to generate a 455-kHz intermediate frequency (IF) signal. This signal is amplified by U2 and subsequently directed...