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-amp from ROHM.
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- Supply +/-15V DC (Dual 15V DC)
- 4 Balanced Outputs Male XLR Connectors
- 1 Balanced Input Female XLR Connector
- 4 Trimmer-Pots (Output Gain Adjust)
- 1 Trimmer-Pot (Master Input Gain Adjust)
Low Noise Dual Supply Voltage Operational Amplifier – BA4560
General-purpose BA4560 op-amp is suitable for any audio applications due to low noise and low distortion characteristics and are usable for other many applications by wide operating supply voltage range. BA4560R is high-reliability products with extended operating temperature range and high ESD tolerance.
Professional stereo audio line receiver is based on INA1650 device is designed to require a minimum number of external components to achieve data sheet 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.
- Supply +/- 15V DC
- Common-Mode Rejection Ratio (CMRR) VIN = 1 Vrms at 1 kHz –90 dB
- THD+N at 1 kHz VIN = +22 dBu –120 dB
- Second Harmonic – VOUT = 10 Vrms, F = 1 kHz –134.35 dBc
- C1,C2 10uF/25V SMD 1210
- C3, C7, C10, C12 10uF/35V Non Polar
- All Resistors SMD 0805 5%
- C6,C11 10uF/35V SMD 1206
- C2, C5, C8, C9, SMD 0805
- LED SMD 0805
The dual-channel INA1650 and single-channel INA1651 (INA165x) SoundPlus™ audio line receivers achieve an extremely-high common-mode rejection ratio (CMRR) of 91 dB while maintaining an ultra-low THD+N of –120 dB at 1 kHz for 22-dBu signal levels. Precision matching of on-chip resistors gives the INA165x devices excellent CMRR performance. These resistors have matching that is far superior compared to external components and are immune to mismatches introduced by printed circuit board (PCB) layout. Unlike other line receiver products, the INA165x CMRR is characterized over temperature and tested in production to deliver consistent performance in a wide variety of applications.
The INA165x devices operate over a very-wide-supply range of ±2.25 V to ±18 V, on 10.5 mA of supply current. In addition to the line-receiver channels, a buffered mid-supply reference output is included, making the INA165x configurable for dual- or single-supply applications. The mid-supply output can be used as a bias voltage for other analog circuitry in the signal chain. These devices are specified from –40°C to +125°C.
- High Common-Mode Rejection:
- 91 dB (Typical)
- High Input Impedance: 1-MΩ Differential
- Ultra-Low Noise: –104.7 dBu, Unweighted
- Ultra-Low Total Harmonic Distortion + Noise:
- –120 dB THD+N (22 dBu, 22-kHz Bandwidth)
- Wide Bandwidth: 2.7 MHz
- Low Quiescent Current: 6 mA (INA1651, Typical)
- Short-Circuit Protection
- Integrated EMI Filters
- Wide Supply Range: ±2.25 V to ±18 V
This little project will drive the signal from your balanced Audio source and increase both its volume and detail. The project has been designed for professional audio lovers, this project is easy to make and low-cost solution for audio professionals, The LME49600 , LME49720 and BA4560 ICs are used to design the project, the project can drive 16 Ohms or 32 Ohms headphones, The project provides high-quality sound and it can be used in professional studios.
- Supply 15V Dual ( +/-12V DC)
- Current 200mA
- Output Load 16/32 Ohms Headphones
- Input Balanced Stereo
- On-Board Power LED
- 5MM EP Stereo Socket Provided for Headphone
- On Board Potentiometer Helps to Adjust the Gain
- Audio Input Using Screw Terminals
- Screw Terminals for Supply Input
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Low Noise Dual Supply Voltage Operational Amplifier – BA4560F
General-purpose BA4558 / BA4560 / BA15218 / BA14741 / BA15532 / BA4510 family and high-reliability BA4558R / BA4560R / BA4564R / BA4580R / BA4584 / BA4584R / BA8522R / BA2115 family integrate two or four independent Op-Amps on a single chip Especially, this series is suitable for any audio applications due to low noise and low distortion characteristics and are usable for other many applications by wide operating supply voltage range. BA4558R / BA4560R / BA4564R / BA4580R / BA4584R / BA8522R / BA2115 are high-reliability products with extended operating temperature range and high ESD tolerance.
The LME49600 is a high performance, low distortion high fidelity 250mA audio buffer. The LME49600 is designed for a wide range of applications. It can be used inside the feedback loop of op amps. The LME49600 offers a pin-selectable bandwidth: a low current, 110MHz bandwidth mode that consumes 7.3mA and a wide 180MHz bandwidth mode that consumes 13.2mA. In both modes the LME49600 has a nominal 2000V/μs slew rate. Bandwidth is easily adjusted by either leaving the BW pin unconnected or connecting a resistor between the BW pin and the VEE pin.The LME49600 is fully protected through internal current limit and thermal shutdown.
The LME49720 device is part of the ultra-low distortion, low noise, high slew rate operational amplifier series optimized and fully specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49720 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49720 combines extremely low voltage noise density (2.7nV/√Hz) with vanishingly low THD+N (0.00003%) to easily satisfy the most demanding audio applications.
Two Channel Audio Signal Mixer Using LM358-BA4560 Op-Amp
- Supply 5V DC ( LM358)
- Supply 12V DC (BA4560)
- Standard Audio Signal Input
- On Board Preset For Gain Set
- Header Connector for Inputs, Output & DC Supply