Accurate Acoustic Sensor – Sound Frequency to Voltage Converter
https://www.electronics-lab.com/project/accurate-acoustic-sensor-sound-frequency-to-voltage-converter/
The project presented here is a sensitive sound sensor. The circuit converts sound frequency and outputs DC voltage. The board consists of LM358 OPAMP and LM2907 IC. LM358 is used as a dual-stage microphone preamplifier and LM2907 acts as a frequency to voltage converter. The circuit provides analog voltage output when it detects sound. The […]
4 x 45W Quad Bridge Audio Amplifier
https://www.electronics-lab.com/project/4-x-45w-quad-bridge-audio-amplifier/
This is an AB class audio amplifier based on the TDA7388 chip and it is a great choice for car audio applications. This compact board has 4 channels each 26W with 4 ohms speaker. Then IC consists of a fully complementary PNP/NPN configuration and the TDA7388 allows a rail-to-rail output voltage swing with no need […]
Audio Line Receiver using INA134
https://www.electronics-lab.com/project/audio-line-receiver-using-ina134/
The project described here is a differential line receiver consisting of high-performance INA134 OPAMPs with on-chip precision resistors. The project is fully specified for high-performance audio applications and has excellent AC specifications, including low distortion (0.0005% at 1kHz) and high slew rate (14V/µs), assuring good dynamic response. In addition, wide output voltage swing and high […]
Audio Line Driver using DRV135 with Balanced Output
https://www.electronics-lab.com/project/audio-line-driver-using-drv135-with-balanced-output/
The project presented here is a differential output amplifier that converts a single-ended audio signal input to a balanced output pair. This balanced audio project consists of high-performance OPAMPS with on-chip precision resistors. They are fully specified for high-performance audio applications and have excellent AC specifications, including low distortion (0.0005% at 1 kHz) and high […]
49W BTL 4 Channel Audio Power Amplifier
https://www.electronics-lab.com/project/49w-btl-4-channel-audio-power-amplifier/
This is a 49W – 4 Channel audio amplifier project that is built using TB2941HQ power Integrated Circuit which has a built-in four-channel BTL amplifier developed for car audio applications. The maximum output power is 49W using a pure complementary P-Ch and N-Ch DMOS output stage. In addition, a standby switch, a mute function, and […]
10W Class-D Stereo Audio Amplifier with Mute, Shutdown and Four Gain Settings
https://www.electronics-lab.com/project/10w-class-d-stereo-audio-amplifier-with-mute-shutdown-and-four-gain-settings/
This is a Class-D Stereo audio amplifier project that provides 10W stereo output. The amplifier includes Gain control using 2 x Jumpers, Mute function, and shutdown function. RCA female connectors are provided for the audio source input, screw terminals are provided for an easy interface with speakers and power supply input. The project was built […]
Analog Style VU Meter on OLED Display – Arduino Compatible
https://www.electronics-lab.com/project/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 Operating Supply: 5V DC 0.96″ OLED display Arduino Compatible PCB dimensions: […]
Low Voltage Microphone Preamplifier with Variable Compression and Noise Canceling
https://www.electronics-lab.com/project/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 optimize circuit operation for a variety of applications. This is a complete and flexible solution for conditioning condenser microphones for personal […]
5 W + 5 W Dual BTL Class-D Audio Amplifier
https://www.electronics-lab.com/project/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 differential audio signal inputs. Jumpers are provided to set the various […]
Microphone Preamplifier – Sound Sensor
https://www.electronics-lab.com/project/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. The pre-amplifier is an important building block for many audio communication […]