Arduino Nano 4 Channel Relay Shield

The Relay Shield is a module with 4 mechanical relays that provides you an easy way to control high voltage using Arduino Nano. 4 Channel Relay Arduino Nano shield contains onboard 4 relays, TSOP1838 Infra-Red Sensor, NRF24L01 RF transceiver module, 4tactile switches.  The circuit described here can be used for many applications like the infra-red remote controller, RF remote controller, 4 channel toggle switch.

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Features

  • Supply 12V DC
  • 4 Relay with Normally Open/ Normally Closed Switch
  • The relay can handle 7Amps 230V AC or 30V DC
  • On-Board TSOP1838 Infra-Red Receiver
  • On Board 4 Tactile Switches
  • On-Board NRF24L01 RF Module

Hardware



 



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.

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Feature

  • Supply Input +/-5V DC
  • Load 16 Ohms to 600 Ohms (32 Ohms Ideal)
  • Output Load 50mW into 32 Ohms Headphone
  • Frequency Response 20 Hz to 20 kHz

3 Amps power operational amplifier using lm675

Power operational board can drive high current load up to 3Amps, the board helpful to drive Dc Motor, solenoid, Lamp, LED and industrial application. The project built around LM675 power op-amp from texas instruments. All resistors are 1%. Refer datasheet of LM675 for further information.

I Output= VIN X 2.5amps/volt

i.e Iout=1A when VIN=400mV

Trimmer Pot for Max Rout

Download PDF PCB Layout

The LM675 is a monolithic power operational amplifier featuring wide bandwidth and low input offset voltage, making it equally suitable for AC and DC applications.

The LM675 is capable of delivering output currents in excess of 3 amps, operating at supply voltages of up to 48V. The device overload protection consists of both internal current limiting and thermal shutdown. The amplifier is also internally compensated for gains of 10 or greater.

Features

  • 3A Current Capability
  • AVO Typically 90 dB
  • 5 MHz Gain Bandwidth Product
  • 8 V/μs Slew Rate
  • Wide Power Bandwidth 70 kHz
  • 1 mV Typical Offset Voltage
  • Short Circuit Protection
  • Thermal Protection with Parole Circuit (100% Tested)
  • 16V–48V Supply Range ( +/-12 To 24V DC)
  • Wide Common-Mode Range
  • Internal Output Protection Diodes
  • 90 dB Ripple Rejection

 

Original Circuit from Texas Instruments Data Sheet

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 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

Components

  1. C1,C2 10uF/25V SMD 1210
  2. C3, C7, C10, C12 10uF/35V Non Polar
  3. All Resistors SMD 0805 5%
  4. C6,C11  10uF/35V SMD 1206
  5. C2, C5, C8, C9, SMD 0805
  6. LED SMD 0805
  7. INA1650

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.

Features-INA1650

  • 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

Lm2596-ADJ Buck Regulator output adjustable 1.2v to 35v load up to 3amps

High efficient and compact project is capable of driving a 3Amp load with excellent line and load regulation with output adjustable 1.2V to 35V DC.  The project built around LM2596ADJ regulator which is ideally suited for easy and convenient design of step-down switching regulator using buck converter topology. Adjustable output version of LM2596 is internally compensated to minimize the number of external components to simplify the power supply design. PCB dimensions 39.65 X 33.20MM

Features

  •     Adjustable Output Voltage Range 1.23 V 35 V
  •     Guaranteed 3.0 A Output Load Current
  •     Wide Input Voltage Range up to 40 V
  •     150 kHz Fixed Frequency Internal Oscillator
  •     Thermal Shutdown and Current Limit Protection
  •     Internal Loop Compensation
  •     Moisture Sensitivity Level (MSL) Equals 1

Applications

  •     Simple HighEfficiency StepDown (Buck) Regulator
  •     Efficient regulator for Linear Regulators
  •     OnCard Switching Regulators
  •     Positive to Negative Converter (buck-boost)
  •     Negative StepUp Converters
  •     Power Supply for Battery Chargers


Bill Of Material
R1 4K7 SMD 0805
R2 1.21K 1% SMD 0804
PR1 TRIMMER POTENTIOMETER
L1 33uH/5A SMD 12MM INDUCTOR
C2,C3 220uF/50V SMD ELECTROLYTIC
C1 100uF/50V SMD ELECTROLYTIC
LM2596-ADJ TO263 SMD ONSEMI/TEXAS INSTRUMENTS
D1 MBRS340T3 SMD ON SEMI
D2 RED LED SMD 0805
CN1, CN2 2 PIN SCREW TERMINALS


Photo-diode amplifier using opa381/opa380 op-amp

This Simple Photo Diode Amplifier project is based on OPA381 Trans-impedance amplifiers. The circuit Convert Current Output of Photodiodes to Voltage. The circuit ideally suited for low noise amplification of very small photodiode current. The circuit required 5V DC and provides approx. 0.5V to 4V DC.

Features

  • Supply 5V DC
  • Output 0.5V to 4V Approx.
  • Convert Current Output of Photodiodes to Voltage

About OPA381

The OPA381 family of Trans-impedance amplifiers provides 18MHz of Gain Bandwidth (GBW), with extremely high precision, excellent long-term stability, and very low 1/f noise. The OPA381 features an offset voltage of 25μV (max), offset drift of 0.1μV/°C (max), and bias current of 3pA. The OPA381 far exceeds the offset, drift, and noise performance that conventional JFET op amps provide. The signal bandwidth of a trans-impedance amplifier depends largely on the GBW of the amplifier and the parasitic capacitance of the photodiode, as well as the feedback

resistor. The 18MHz GBW of the OPA381 enables a trans-impedance bandwidth of > 250kHz in most configurations. The OPA381 is ideally suited for fast control loops for power level measurement on an optical fiber. As a result of the high precision and low-noise characteristics of the OPA381, a dynamic range of 5 decades can be achieved. This capability allows the measurement of signal currents on the order of 10nA, and up to 1mA in a single I/V conversion stage. In contrast to logarithmic amplifiers, the OPA381 provides very wide bandwidth throughout the full dynamic range. By using an external pull-down resistor to –5V, the output voltage range can be extended to include 0V.

5V & 12V Output DC-DC Converter with large current relay for cnc driver (Mach3)

Single Channel Large current relay board with dual DC-DC converter board is mainly designed for Hobby CNC, Routers, and Plasma cutters. Hobby CNC controller required multiple DC outputs to drive several things.  This board provides 5V DC and 12V DC 1Amp each. The dual supply helps driving LPT breakout board, Sensors, Limit switches and few other things required 5V and 12V.

The Relay has large current handle capacity can be used to drive spindles, solenoids, water pump, chiller,  The relay required TTL High signal to trigger or it has the facility to even trigger with GND signal.

Important project for CNC Hobbyist Mach3, Mach4 based CNC drivers 

Features

  • Supply Input 15V to 35V DC
  • DC Outputs 5V @ 1A & 12V 1A
  • On-Board LED for Relay Output
  • Relay Contact 20Amp NC and 30 Amps No 230V AC
  • Relay Trigger 5V TTL in or GND input
  • Screw Terminal and 2 Pin Header Connector Provided for Supply Input
  • Screw Terminal and 2 pin header provided for 5V DC & 12V DC Output
  • 3 Pin Screw Terminal Provide for Relay output Connections NO/NC
  • 3 Pin Header Connector for TTL + Signal Trigger, and Low GND signal Trigger
  • Close The Jumper to trigger rely with low GND signal input

Studio-Grade Fully Balanced Stereo Headphone Amplifier Using LME49600 and BA4560

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.

Features

  • 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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BA4560

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.

LME49600

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.

LME49720

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.

Electret Capsule Micro-Phone Pre-Amplifier Using TLV6741 Op-Amp

I am here with one more electret microphone preamplifier. This circuit uses an op-amp in a trans-impedance amplifier configuration to convert the output current from an electret capsule microphone into an output voltage. The common mode voltage of this circuit is Constant and set to mid-supply eliminating any input–stage cross over distortion, Circuit and description of the project from Texas Instruments Application. The circuit is based on TLV6741 Op-Amp from Texas Instruments.

Features

  • Supply 5V DC
  • Input Pressure 100dB SPL(2Pa)
  • Output Voltage 1.228V
  • Frequency Response Deviation @20Hz>-0.5dB,@20Khz>-0.1dB

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Microphone Parameter

  • Sensitivity @94dB SPL (1Pa) >>-35+/-4dBV
  • Current Consumption (Max)>>0.5mA
  • Impedance>> 2.2KOhms
  • Standard Operating Voltage 2V



Op-Amp TLV6741

The TLV6741 operational amplifier (op-amp) is a general-purpose CMOS op-amp that provides low noise of 3.7 nV/√Hz and a wide bandwidth of 10 MHz. The low noise and wide bandwidth make the TLV6741 device attractive for a variety of precision applications that require a good balance between cost and performance. Additionally, the input bias current of the TLV6741 supports applications with high source impedance. The robust design of the TLV6741 provides ease-of-use to the circuit designer due to its unity-gain stability, integrated RFI/EMI rejection filter, no phase reversal in overdrive conditions and high electrostatic discharge (ESD) protection (1-kV HBM). Additionally, the resistive open-loop output impedance makes it easy to stabilize with much higher capacitive loads. This op-amp is optimized for low-voltage operation as low as 2.25 V (±1.125 V) and up to 5.5 V (±2.75 V), and is specified over the temperature range of –40°C to +125°C. The single-channel TLV6741 is available in a small size SC70-5 package.

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