Blanced 4 Channel Audio Distribution Amplifer ( BA4560) Op-Amp

Circuit described here is a four channel audio distribution amplifier. The input and all four outputs may be connected through the XLR jacks. The input accepts a balanced. Each of the four outputs provides line level balanced signal. On board Trimport provided to adjust the gain of each output channel and also Master gain adjust for input signal, Trim-pot can be replaced with 16mm Potententiometer, circuit required dual15 V DC supply (+/-15V DC). Circuit designed using low noise BA4560 Op-amps from ROHM.

Balanced Audio Line Driver (Unbalance to Balance Audio Signal Converter) Using DRV135/SSM2142

Balanced Audio head-phone amplifier ( Balanced audio monitor)

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


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  

The primary application of the project is to replace the mechanical potentiometer with an optical encoder which is a long life, accurate, smooth in operation. The simple project has been designed around LS7184 quadrature clock converter IC from LSI semiconductor, AD5220-10 Digital potentiometer from Analog Devices, and optical encoder from Burns.

LM386 Based Audio Amplifier Circuit

The Tiny Audio Amplifier MODULE  is a good choice for battery operation. It is based on  LM386 IC, useful in various applications like robotics, science projects, intercom, FM radio and many more.

LM386 Based Audio Amplifier Circuit With deferential Signal Input

The Tiny board designed using LM386 SMD SO8 IC, the amplifier is designed for voice record IC which provides deferential signal outputs.

Stereo Tape Head Pre-Amplifier LA3161

The circuit is built around a popular Sanyo’s stereo head preamp IC LA3161. Low electrical signals from the playback heads are fed to pins 1 and 8 of IC1 via DC decoupling capacitors, respectively. Components between pins 2 and 3 and pins 6 and 7 provide adequate equalization to the signals for normal tape playback.


12W Audio Amplifier Circuit Using TDA2006

Project is built around TDA2006 PENTAWATT package. TDA2006 provide high output current and have very low harmonic cross-over distortion. Further, the device incorporates an original (and patented) short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their safe operating area. A conventional thermal shutdown system is also included. The TDA2006 is pin to pin equivalent to the TDA2030.


14W Stereo Audio Amplifier Schematic Using LM4730

14W Stereo audio power amplifier builds around LM4730 IC. The LM4730 is a stereo audio amplifier capable of delivering typical 14W per channel of continues average output power a 4 Ohms or 8 Ohms load.


Microphone Pre-Amplifier Circuit Using LM358

This is easy to construct a microphone pre-amplifier project using a compact electret condenser microphone. The pre-amplifier is an important building block of many audio communication systems. The circuit has been built around Op-Amp LM358.


20W Bridge Audio Amplifier Circuit Using TDA2005

20W Bridge Audio Amplifier project, based on the TDA2005 IC, The TDA 2005 IC is class B dual audio amplifier, specifically designed for car radio applications etc.


Small Signal Amplifier (Pre-Amplifier) for Audio Signal Circuit Using LM358

The Stereo small level audio signal amplifier has been developed to amplify the low-level stereo audio signal, without changing other parameters of the waveform such as frequency and shape of the signal.  Audio frequency amplifiers are used to amplify signals in the range of 20Hz to 20 kHz. These amplifiers are used to amplify the low-level signals from microphones, ultra-sonic transducer, and other audio signal sources. The project amplifies the low-level signal and then provide a sufficient voltage level to drive power audio amplifier. The gain of the amplifier can be changed by onboard preset. The circuit has preset at the output to set the audio signal level.


6.5W Stereo Audio amplifier circuit Using TDA2004

The 6.5W Stereo Audio Amplifier project built around TDA2004 IC. The TDA2004 is a class B dual audio power amplifier, specifically designed for car radio applications etc.


Mini Stereo Audio Amplifier Circuit Using TDA2822

Mini Stereo Audio Amplifier project is designed for portable radio players and other building block projects.  It is based on TDA2822 IC.


Tiny Mic Pre-Amplifier Circuit Based On BC547

The Tiny Mic Pre-amplifier project is based on a single transistor.  It amplifies the output of the electret condenser microphone. The project amplifies low-level signal coming from the microphone and then provide a sufficient voltage level to drive power audio amplifier. Good choice for Karaoke.


5 LED VU Meter project is based on LB1403/CH1403 IC from SANYO, which will indicate the volume level of the audio signal it senses.


Low Noise Hi-End Electret Microphone Pre-Amplifier Circuit Using OPA172 OP-AMP


Audio Signal To Light Unit Using 200W Halogen Lamp


6W Audio Amplifier Circuit Using TDA2006

12W Mono Audio Amplifier Circuit (1)

 12W Audio Amplifier Using TDA2030

5W Stereo Audio Amplifier Using BA5406

6W Stereo Audio Amplifier


20W Audio Amplifier Circuit Using LM1875 IC

 20W Proffesional Audio Amplifier Using LM1875 (1)

HI-FI Stereo Audio Amplifier Using LM1875 20W Output


Phono Pre-Amplifier


Balance Audio Pre-Amplifier Circuit


Balance Microphone Pre-Amplifier