MIC PRE-AMPLIFIER

This project is a microphone pre-amplifier based on LM358.

DESCRIPTION

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

  • Power supply : 5 to 12 VDC @ 10 mA
  • Output: Gain Approx. 100
  • On-Board electret condenser microphone
  • Header connector for connecting of power supply input and audio output
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 35 mm x 40 mm

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MINI AUDIO AMPLIFIER

This project is a mini Audio Amplifier based on LM386 IC.

DESCRIPTION

The Mini Audio Amplifier project is a good choice for battery operated gadgets.  It is based on Texas instruments LM386 IC, provides high quality Audio.

SPECIFICATIONS

  • Wide power supply input 6 to 12 VDC
  • 500 mW output @ 8 Ohms load
  • Takes standard audio signal as input
  • Low quiescent current drain 4 mA IC
  • The quiescent power drain is only 24 mW when operating from 6 VDC
  • Onboard preset for volume adjust
  • Header connector for connecting power supply, audio signal and speaker
  • Onboard power indication LED
  • On/Off PCB mounted slide switch for power supply
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 41 mm x 41 mm

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We are now selling a similar LM386 based audio amplifier module for beginners and hobbyists.

BC01

2 x LM386 Audio Amplifier Module

US $7.50
This is a basic audio amplifier module for
BCLM386
Categories:

LM386 Audio amplifier DIY Kit

US $5.50
BC-818

PAM8302- Mono 2.5W Class D Audio Amplifier

US $4.95
This amplifier module is similar to LM386 module.

14W STEREO AUDIO AMPLIFIER

This project is a 14W Stereo Audio Amplifier based on LM4730 IC.

DESCRIPTION

14W Stereo audio power amplifier build around LM4730 IC. The LM4730 is stereo audio amplifier capable of delivering typical 14W per channel of continues average output power a 4 Ohms or 8 Ohms load with less than 10% THD+N from  20Hz to 20Khz frequency. Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled by onboard slide switches.

 The LM4730 has short circuit protection and thermal shutdown feature that is activated when the IC temperature exceeds 150 centigrade. The LM4730 also has under voltage lock out feature for click and pop free power off and on. Amplifier required proper heat sink.

APPLICATIONS

  • Audio Amplifier for High End Stereo TVs
  • Audio Amplifier for Component Stereo
  • Audio Amplifier for Compact Stereo
  • Audio Amplifier for PC
  • Audio Amplifier for Self Powered Speakers

SPECIFICATIONS

  • Outout Power into 4 Ohms or 8 Ohms , 14W
  • THD+N  10%
  • THD+N at 1Khz with 2X1W into 8Ohms 0.02%
  • Mute Attenuation 85dB
  • Standby Current 3.5mA (+/- 17V)
  • Dual power supply – ±18 VDC
  • Less then 10% THD+N from 20 Hz – 20 KHz
  • Onboard slide switch for mute and standby mode
  • Terminal pins for connecting left and right audio signal inputs
  • Header connector for connecting Potentiometer (POT) for volume adjustment
  • Power Battery Terminal (PBT) for easy dual power supply and speakers connection
  • Power-On LED indicator

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5.5W – 2 CHANNEL AUDIO AMPLIFIER

This project is a 5.5W – 2 Channel Audio Amplifier based on LA4445 IC.

DESCRIPTION

The small 2 Channel amplifier constructed around Sanyo’s LA4445 IC delivers 5.5Watts +5.5 Watts at 4 ohm load, supply in 12V DC 2Amp, Input impedance 30K.

SPECIFICATIONS

  • Dual Channels output : 5.5W
  • Minimum External Parts
  • Very small pop noise at the time of power supply ON/OFF
  • Good ripple rejections
  • Small residual noise
  • Built-in protectors 1. Thermal Protector 2. Overvoltage Surge Protector
  • Standard Audio signal
  • Supply 12V DC
  • Load: 4 Ohms Speaker on Each Channel
  • Voltage Gain : 50DB
  • Output 5.5W on each Channel (THD 10%)
  • Total harmonic distortion 1% Max @ Po=1W
  • Input impedance 30 K-ohms

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MINI STEREO AUDIO AMPLIFIER

This project is a Mini Stereo Audio Amplifier based on TDA2822 IC.

DESCRIPTION

The dual low power amplifier built around TDA2822 8pin DIP. IC, it is mainly designed to use in portable players, radios and other building block project. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel, and a 12V power supply will provide 1W in 8 Ohm per channel for small loudspeakers.

SPECIFICATIONS

  • Supply 9V DC (supply Range 3V to 12V)
  • Load 8 Ohm Speaker
  • Gain 39dB
  • Input Impedance 100K Ohm
  • THD 10%
  • Frequency Response 20Hz to 20Khz

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6.5W STEREO AUDIO AMPLIFIER

This project is a 6.5W Stereo Audio Amplifier based on TDA2004 IC.

DESCRIPTION

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.

SPECIFICATIONS

  • Power supply input 15 VDC
  • Output power: 2 X 6.5 W, 4 Ohm / 2 X 10 W, 2 Ohm
  • Short circuit, thermal shut-down, load dump voltage surge protection
  • Terminal pins for connecting left and right audio signal inputs
  • Header connector for connecting potentiometer (POT) for volume adjustment
  • Screw terminal connector for easy supply input and speaker output connection
  • Power-On LED indicator
  • Heat-sink for IC
  • PCB dimensions 67 mm x 73 mm

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10W STEREO AUDIO AMPLIFIER

This project is a 10W Stereo Audio Amplifier based on TDA1521 IC.

DESCRIPTION

The project built around Philips TDA1521 IC, The project provides high quality audio 2X10W Audio output. The device is specially designed for mains fed applications, (e.g. Stereo TV Sound and Stereo Radio). The circuit designed for asymmetrical power supply systems.

SPECIFICATIONS

  • It has few external components
  • Input muted during power on and off
  • Low offset voltage between output and ground
  • Excellent gain balance between channels
  • Short circuit proof IC
  • Thermally protected
  • Supply 18V DC @ 3.5A
  • Output Power 2X10W
  • Voltage Gain 30dB
  • Frequency response 20Hz-20Khz
  • Input impedance 20K Ohm
  • Output load 8 Ohm
  • Recommended power supply 18V @ 3Amps

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1.6W MONO AUDIO AMPLIFIER

1.6W Mono Audio Amplifier Project is based on TDA7231, which is class AB power amplifier with a wide range of supply.

FEATURES

  • Power supply: 5  To 12 VDC
  • Output: 1.6 W, 4 Ω / 1 W, 8 Ω
  • Low crossover distortion, soft clipping
  • PR1 Preset for Volume Adjust
  • Terminal pins for connecting power supply, input and output
  • Power On/OFF Switch
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 36 mm x 52 mm

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TINY MIC PREAMPLIFIER

The Tiny Mic Preamplifier based is based on a single transistor amplifier design.  It amplifies the output of the electret condenser microphone.  Good choice for Karaoke.

SPECIFICATIONS

  • Power supply: 5 ~ 9 VDC @ 2 mA
  • Provides standard audio signal
  • PCB dimensions 26 mm x 56 mm

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2 CHANNEL RELAY SHIELD FOR ARDUINO NANO

2 Channel Mini easy to use Relay shield for Arduino Nano consists of ULN2003 IC and 2 Mini 12V Relays with NO/NC contacts of 2A-24V Load Capacity. ULN2003 used as Relay coil driver. Relay can be controlled from D3 and D4 of Arduino Nano. Three-pin Header Connector CN1 and CN2 provided to connect the Load. Relay has normally open and normally closed contacts with 2A and 24V capacity and also can handle 120V AC but it’s not advisable. CN2 supply input 12V DC. LED D2 and D3 are the output LEDs.

FEATURES

  • Supply 12V DC
  • Relay Load 2A-24V DC (120V AC Possible with Care)
  • Relay Switch Normally Closed/Normally Open
  • On Board LED D2 and D3 Operation Indicator

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4 DIGIT 7 SEGMENT DISPLAY SHIELD FOR ARDUINO NANO

4 Digit Multiplexed display shield for Arduino Nano with onboard 2 tactile switches and LM35 temperature sensor. This shield helps you to develop many projects that require 4 digit display. For example, a thermometer can be made using on board LM35 sensor.  7 Seven segment multiplexed display is a tiny board and has been designed around Common cathode 4 digit Display. Display has 12 Pins. The board is provided with current limiting resistors on all LED segments and 4 NPN Transistors to drive 4 digits. This tiny board directly seats on Arduino Nano.  Nano analog pin A0 connected to LM35 sensor, A1 and A2 connected to Switch 1 and switch 2 with pull down resistors. Digital pin D2-D8 connected to displays segment A-F, Digital pin D9 connected to DP of display, D10-D12 pins are associated to Digit 1-4 common cathode.

FEATURES

  • Supply 5V DC
  • 4 Digit 0.3 Inch Common Cathode 7 segment display
  • On board 2 Tact switch
  • On Board Female Connector to install LM35 Temperature sensor

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10 LED BAR-GRAPH DISPLAY WITH OP-AMP SHIELD FOR ARDUINO NANO

Arduino Nano Bar-Graph display with universal op-amp shield consists of 10 LEDs and single low voltage general purpose LMV321 op amp including few capacitors and resistors connected to op-amp pins. The op-amp proto area can be configured without any modifications to the board and all that is necessary is to select the correct resistors and capacitors. The other optional components can be left open or shorted depending on the configuration desired. All 10 LED comes with current limiting series resistors connected to digital pins D2 to D11 of Arduino Nano, Nano analog pin A0 used as input, the input can be used directly as voltage input to measure the voltage and display on Bar-graph.

0 To 5V Bar-graph volt meter with 0.5V step is simplest project possible with the shield, many other sensor based application possible using op-amp as signal conditioning amplifier.

Code for Simple Bar-Graph Voltmeter with 0-5V range is available here.

https://www.arduino.cc/en/Tutorial/BarGraph

FEATURES

  • Supply 5V DC
  • 10 LED Connected to D2-D11 pins of Nano
  • Universal Op-Amp proto available
  • Trimmer Potentiometer provided to fine adjust the analog input Voltage
  • A0 Analog pin with series resistor is available for input

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8 DIGIT NUMERICAL 7 SEGMENT SPI DISPLAY SHIELD FOR ARDUINO UNO

8 Digit serial numerical display shield for Arduino has been designed for various applications like digital clock, stop watch, score display, temperature meter, frequency counter, digital meters etc. The circuit uses popular MAX7219 IC and two common cathode 0.5inch red seven segment displays. The MAX7219 is a compact, serial input/output common-cathode display drivers that interface Arduino UNO to 7-segment numeric LED displays of up to 8 digits. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor R1 provided to set the segment current for all LEDs.  A convenient 3-wire serial interface connects to all Arduino UNO. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219 also allows the user to select code-B decoding or no-decode for each digit. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on. The project works with 5V DC and SPI interface connected to Arduino Digital pins D4, D5 and D6.

KEY FEATURES

  • SUPPLY 5V DC
  • Additional CN1 provided for external micro-controller
  • Switches S1, S2, S3 for development, connected to Arduino Pin Analog A3, A4, A5
  • CN2 for analog input to Arduino Analog pin  A0
  • SPI Serial Pin connected to D4, D5, and D6 of Arduino UNO
  • Additional SPI Connector provided to use the board with other micro-controller board
  • 10MHz Serial Interface
  • Individual LED Segment Control
  • Decode/No-Decode Digit Selection
  • 150µA Low-Power Shutdown (Data Retained)
  • Digital and Analog Brightness Control
  • Display Blanked on Power-Up
  • 8 Digit Common-Cathode LED Display

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4 CHANNEL RELAY SHIELD FOR ARDUINO UNO

4 Channel Relay Shield for Arduino UNO is a simple and convenient way to interface 4 relays for switching applications in your project. Very compact design that can fit on top of Arduino UNO. Project requires 12V DC supply, all 4 trigger inputs require TTL signal, Relay-1 to Relay-4 inputs connected to D8 To D11 of Arduino digital pins through solder jumpers J1 To J4. All trigger inputs can be connected to other I/O pins of Arduino using female header connectors and you will need to open solder jumpers J1-J4 in this case.  D1, D2, D3, D4 LEDs provided to indicate the Relay ON/OFF status. D5 is Power LED. Each relay has 3 pin screw terminals with normally open/normally closed switch to connect the load. Project is ideally used for low voltage applications and requires extra care in case of using high voltage AC switching.

FEATURES

  • Input supply 12 VDC @ 170 mA ( Arduino DC Jack)
  • Output four SPDT relay
  • Relay specification 7A/24V DC-230V AC
  • Trigger level 2 ~ 5 VDC
  • Header Connector for connecting power and trigger voltage
  • Solder Jumpers J1, J2, J3, J4 Interface Arduino Pins D8, D9, D10, D11
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output
  • PCB Dimensions 68.37MM x 51.91 MM

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2 CHANNEL HIGH CURRENT ARDUINO RELAY SHIELD

2 Channel Relay Shield for Arduino UNO is a simple and convenient way to interface 2 relays for switching applications in your project. The board has been designed using large current relay that can handle a load up to 30Amps. Relay circuit is optically isolated to prevent any kind of EMI noise. The board directly seats on Arduino Uno. Project requires 12V DC supply, Relay-1 can be controlled using digital pin D12 of Arduino and Relay-2 interfaced to digital pin D2 of Arduino, J1 and J2 solder jumpers provided in case of Arduino and Relay board to be power up from same supply line. LED D2 and LED D4 indicate the Relay ON/OFF operations. Open the jumpers J1 and J2 in case of complete isolation required.

Specifications

  • Input: 12 VDC @ 160mA
  • Output: Two SPDT relay
  • Relay specification: 30 A /230V
  • Screw Terminal to supply Arduino
  • CN3 Power Input to Relay Board
  • Trigger voltage input TTL level
  • Digital Pin D12 Connected to Relay 1 and D2 to Relay 2
  • Header connector for connecting power and trigger voltage
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output connection
  • PCB Dimensions 68.37mm X 51.01 mm

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3.6A BIDIRECTIONAL DC MOTOR DRIVER SHIELD FOR ARDUINO NANO

This is another Arduino Nano shield which can drive a Brushed DC Motor in both directions with PWM signal for speed control and it also includes current trip feature. Project is based on DRV8870 IC which can handle current up to 3.6Amps, The shield also includes an IR sensor and trimmer potentiometer. Trimmer Pot helps to develop speed motor control application, IR sensor can be used to make remote based DC motor driver. DRV8870 requires two PWM signals to control the motor speed and direction and both these pins are connected to D9 and D10 PWM pins of Arduino Nano.  Analog pin A0 connected to Trimmer Pot, digital pin D12 connected to IR sensor, two IN1 and IN2 PWM pins are connected to Digital PWM pin D9 and D10 of Arduino Nano. The board can drive brushed DC Motor up to 3.6Amp and voltage 6.5V to 12V DC.  This shield can drive higher voltage DC motor up to 45V with few changes. Remove R3 and D1 and use higher value and voltage rating capacitor C1 on motor supply. Trimmer potentiometer PR1 is used to adjust the maximum load trip current. For more information refer DRV8870 datasheet.

A single-power input, VM Motor supply, serves as both device power and motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100 kHz. The device has an integrated sleep mode that is enabled by bringing both inputs low. An assortment of protection features prevent the device from being damaged if a system fault occurs.

DRV8870 DESCRIPTION

The DRV8870 device is a brushed-DC motor driver for printers, appliances, industrial equipment, and other small machines. Two logic inputs control the H-bridge driver, which consists of four N-channel MOSFETs that can control motors directionally with up to 3.6-A peak current. The inputs can be pulse-width modulated (PWM) to control motor speed, using a choice of current-decay modes. Setting both inputs low enters a low-power sleep mode. The DRV8870 device features integrated current regulation, based on the analog input VREF and the voltage on the ISEN pin, which is proportional to motor current through an external sense resistor. The ability to limit current to a known level can significantly reduce the system power requirements and bulk capacitance needed to maintain stable voltage, especially for motor startup and stall conditions.

FEATURES

  • Supply 6.5V to 12V DC
  • Motor Load Up to 3.6Amps
  • Over Load Current Facility
  • Over Load Trip Adjust Trimmer Pot
  • Trimmer Pot provided on Analog Pin A0 to make Motor Speed Controller
  • IR Sensor On D12 Digital Pin
  • PWM Frequency 0-100Khz
  • Motor Input Pin In1 and In2 Connected to D9 and D10 PWM Pins
  • PCB Dimensions 59.19mm X 38.15mm

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8 CHANNEL OPTICALLY ISOLATED I/O SHIELD FOR ARDUINO NANO

This shield enables you to interface many different devices to Arduino Nano using optically isolated inputs/outputs. The circuit consists of 4 Input channels and 4 Output channels and all 8 I/O lines are optically isolated. This project can help in various industrial applications where EMI noise and high voltage lines can damage the Arduino Nano or other circuits connected to it.  Circuit is built using 8 x 6N137 optocoupler. The 6N137 optocoupler can switch at frequency up to 10 MHz.

Features

  • Supply of Arduino Nano 7-12V DC
  • Supply to Outputs of Optocoupler 5V DC
  • All Outputs are TTL 5V
  • Inputs 3.3V to 5V DC
  • 4 Channel Inputs
  • 4 Channel Outputs
  • PCB Dimensions 61.09 mm X 48.89 mm

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8 RGB LED DRIVER SHIELD FOR ARDUINO NANO WITH OPTICAL DEFUSE SENSOR

The board consists of 8 x RGB LEDs 1W, BJT transistors on each LED, series resistor across the LED for current limiting, a hole to mount 18mm optical sensor which may be a defuse sensor for object detection with Arduino nano.  The board can be programed to create multiple RGB LED related applications, like interactive lamp, automatic bathroom light etc. I have used Omron E3F-D32 defuse optical sensor which can detect human or object at a distance up to 300mm. When the sensor detect any object within the range of 300mm its toggles output. The output is PNP type, the range of sensor is adjustable using trimmer pot and also sensor has LED operation indicator. All RGB LED transistors connected to D3, D5, D6 of Arduino PWM pins which helps to create multi-color effects. Optical sensor connected to digital pin D13 of Arduino Nano. Board also has prototype area to mount other sensors or circuitry and some additional components are provided to make PIC based applications or RS485 based RGB LED controller. Circuit works with 12V DC input.

FEATURES

  • Supply 12V DC
  • 8 RGB LEDs Each 1W
  • Defuse Reflective Sensor for Interactive Light
  • PCB Diameter 92.06 MM

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10 X 1W WHITE LED SHIELD FOR ARDUINO UNO

This project includes 10 LEDs of 1W each, and provides high intensity lighting that can be used in various applications. The board is made in Arduino shield form and can be used with Arduino Uno or Mega. Each LED can be controlled individually connected to digital pins D2-D11 of Arduino. Circuit requires 9-12V supply, it can work with lower supply by changing current resistor across LEDs. Applications include: Large size Bar-graph monitor, led sequencer, strobe, LED light effects are possible applications with this board. CN3 provided to interface PYRO sensor or any sensor to create interactive light effects.

FEATURES

  • Supply 9-12V DC
  • Maximum Load on each channel 200mA (Total 2Amps)
  • LED 1-10 Connected to D2,D3,D4,D5,D6,D7,D8,D9,D10,D11 of Arduino
  • CN2 Power Input
  • CN3 Sensor Interface
  • PCB dimensions: 87,79 x 51.17mm

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VOICE CHANGER

B011-500x500-500x500Voice Changer project can be used to transpose or distort one’s voice by encoding the sound appearing at the Microphone input.  This project  is built around AP8072 IC.

SPECIFICATIONS

  • Supply input : 6 VDC @ 200 mA
  • Output : Speaker, 8 Ω / 0.5 W
  • Audio amplifier type LM386 with volume control preset
  • Jumper selectable tone frequency for encoding sound
  • 4 Tones to choose
  • Built in noise reduction circuit for reducing environment noise
  • On/Off Jumper connector for power supply input
  • Berg connector for power supply input and speaker output
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 48 mm x 52 mm

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