Analog Style VU Meter on OLED Display – Arduino Compatible

Analog Style VU Meter on OLED Display – Arduino Compatible

This is an analog-style VU meter on a 0.96" OLED Display. The project has a 0.96" OLED display, Atmega328 Microcontroller, 3.5 mm audio EP socket for audio signal input. This Arduino compatible hardware can be program using Arduino IDE. Operating Supply 5V DC. Specifications...

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961
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Low Voltage Microphone Preamplifier with Variable Compression and Noise Canceling

Low Voltage Microphone Preamplifier with Variable Compression and Noise Canceling

This is a complete microphone signal conditioning project. Designed primarily for voice-band applications, this project provides amplification, limiting, variable compression, and noise gate. User-adjustable compression ratio, noise gate threshold, and two different fixed gains...

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968
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5 W + 5 W Dual BTL Class-D Audio Amplifier

5 W + 5 W Dual BTL Class-D Audio Amplifier

The project described here is a high-efficiency dual BTL class-D audio amplifier with single supply operations. The project was built using TDA7491LP13TR from ST. The low profile PCB design can fit in a small area, operating power supply 9-12V DC, Project supports single-ended or...

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814
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Microphone Preamplifier – Sound Sensor

Microphone Preamplifier – Sound Sensor

This is an easy to construct dual-stage microphone pre-amplifier. The project can be used as a sound sensor or microphone pre-amplifier. The 1st op-amp pre-amplify the very low-level signal coming from the condenser microphone and 2nd op-amp provides more boost to the audio signal....

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1261
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3 Comments
Stereo Balanced to Unbalanced Audio Converter

Stereo Balanced to Unbalanced Audio Converter

The primary role of this project is to convert a differential input audio signal into a single-ended output signal while rejecting noise that is common to both inputs (common-mode noise). The circuit presented here is a differential amplifier intended to receive balanced line...

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1345
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3W Stereo Differential Input CLASS-D Audio Amplifier with UP/DOWN Volume

3W Stereo Differential Input CLASS-D Audio Amplifier with UP/DOWN Volume

The circuit presented here is a 3W stereo audio amplifier with memory UP/DOWN volume control. The project is based on PAM8408 IC from Diode Incorp which is a filter-less class-D amplifier with high SNR and Differential input which helps eliminate noise. Two tactile switches are...

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1611
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Audio-Balanced Line Driver – Unbalanced Audio to Balanced Audio Converter

Audio-Balanced Line Driver – Unbalanced Audio to Balanced Audio Converter

This audio-balanced line driver project enables to drive hundreds of feet in length of cables without becoming unstable The project is based on the THAT1646 chip, which is a new generation monolithic differential line driver that offers improved performance over conventional...

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2212
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Headphone Amplifier For DAC Converter

Headphone Amplifier For DAC Converter

This is a headphone amplifier project for audio digital-to-analog converters (DACs) with differential voltage outputs. This circuit converts the differential voltage output of the DAC to a single-ended, ground-referenced signal and provides the additional current necessary for...

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2530
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