Hi-End Headphone Amplifier for DACs Differential Signal input
Simple stereo headphone amplifier for audio DACs required a differential signal. The circuit works with dual +/-5V DC supply, the project can drive load 16 Ohms to 600 Ohms. Headphone amplifier provides output 50mW into 32 Ohms. Signal for the right channel and left channel input is applied to the amplifier through connectors CN1and CN3, respectively. The source such as an audio analyzer or audio digital-to-analog converts (DAC). The positive input from the source connects to the pin labeled I1+/I2+, the negative input from the source connects to the pin labeled I1-/I2-, and the ground connection from the source connects to the center pin of CN1 and CN3, labeled GND. Output connections are provided through the use of the CN2, CN4 provided to power up the board, D1 power LED. OPA1688 or OPA1622 op-amps are good for the applications.
Balanced Audio Line Driver (Unbalance to Balance Audio Signal Converter) Using DRV135/SSM2142
Useful audio device for audio professionals, tiny board is a balanced headphone monitor, based on BA4560 op-amp, project works with 12V DC supply, Female XLR connector helps to feed balanced audio input, male XLR connector for parallel balanced signal output, and 3.5MM Stereo EP socket provided to connect headphone, easy supply input using standard DC socket, onboard potentiometer provided to adjust the gain.
Audio line receiver/Studio Grade 2-channel audio line receiver using ina1650
Professional stereo audio line receiver is based on INA1650 device is designed to require a minimum number of external components to achieve datasheet level performance in audio line-receiver applications. Circuit shows the INA1650 used as a differential audio line receiver in split-supply systems that are common in professional audio applications. The line receiver recovers a differential audio signal which may have been affected by significant common-mode noise. The INA1650 is a high common-mode rejection audio line receiver from the Sound Plus line of audio Amplifier products from Texas Instruments.
Studio-Grade Fully Balanced Stereo Headphone Amplifier Using LME49600, LME49720 and BA4560
Electret Capsule Micro-Phone Pre-Amplifier Using TLV6741 Op-Amp
MINI MICROPHONE PRE-AMPLIFIER USING LM358
3.1W Stereo Audio Amplifier
The LM4952 is a dual audio power amplifier primarily designed for demanding applications in flat panel monitors and TV’s. It is capable of delivering 3.1 watts per channel to a 4Ω single-ended load with less than 1% THD+N when powered by a 12VDC power supply.
68W High-Performance Stereo Audio Amplifier Using LM3886
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz.
Tiny stereo audio amplifier board has been designed around SMD TDA7266D IC from ST. The TDA7266D is a dual bridge amplifier specially designed for Portable Audio, for LCD TV/Monitor, PC Motherboard, and TV applications. This circuit provides high-quality audio output of 3W approx. on each channel with standard audio signal input. The circuit works with 3.5V to 5V.
Digital Volume Control for Audio Amplifiers Using Rotary Encoder