Electronics and Electrical Engineering Design Projects

Featured electronics and electrical engineering design projects.

Featured Projects by Members

  • Figure:1 Circuit Diagram of Light Activated Switch

    Light Activated Switch Using LDR

    Posted Nov 30, 2014 By Sudheer Gupta
    The main principle of this circuit is to switch ON the light when the LDR is illuminated. The light dependent resistor will have high resistance in darkness and low resistance in the light. The comparator used here has LDR connected to its inverting terminal and potentiometer connected to its non-inverting pin. When the light falls on the Light Dependent Resistor, the comparator compares the…
  • Figure:2 Emergency Lights using Cool White LEDs Circuit Diagram

    Emergency Lights using Cool White LEDs

    Posted Nov 23, 2014 By Sudheer Gupta
    This is the simple and cost effective automatic emergency light circuit with light sensing. This system charges from main supply and gets activated when main supply is turned OFF. This emergency lamp will work for more than 8 hours. Circuit Principle When power supply is available, battery charges through the diode D2. At the same time white LED’s will glow based on the light conditions….
  • Figure:3 Electronic Code Lock using Single Transistor

    Electronic Code Lock using Single Transistor

    Posted Nov 16, 2014 By Sudheer Gupta
    This article describes one transistor code lock circuit which is a key coded door lock system. Here interesting thing about this circuit is that it can be done without any programming. This circuit is simple and made up of simple transistor and buttons. Circuit Principle The main principle of this circuit is that the door lock opens only when the buttons in series are pressed at a time. If…
  • Figure:4 Circuit Diagram

    Police Lights Using 555 Timer

    Posted Nov 09, 2014 By Sudheer Gupta
    This circuit simulates the police car lights by alternate flashing. This circuit flashes red LEDs for three times and blue LED’s for three times. This flashing action performs continuously. This circuit uses 555 timer and a decade counter. Here, 555 timer runs in astable mode. Decade counter 4017 counts the incoming pulses that is for first pulse Q0 becomes high and for second pulse Q1 becomes…
  • Figure:5 meet: miniRobot!


    Posted Nov 02, 2014 By Yuri Tikhonov
    Introduction Not so long ago I was participating in AXP Logic Design Contest and took an honorable place there. I created an ultra-miniature robot that I called “nanoRobot”. On the prototyping stage I had to significantly increase the robot’s size. After that I created a new power system, control system and sensors system. As you understand it was an absolutely different robot. I…
  • Figure:6

    LPG Pumping Machine Controller

    Posted Oct 12, 2014 By Deepak Gupta
    The requirement of the project was to implement a small PCB that can be attached on to the motor itself. Hence we used the PIC12 microcontroller that has a very small foot print as well as a very low cost. The current sense input determines the load that that motor is experiencing and hence based on the load of the motor and also a internal timer the pumping was to be cut off.
  • Figure:7 Analog Section

    10 - 100 Micro Amp Constant Current Source

    Posted Oct 05, 2014 By Deepak Gupta
    Analog Section The project has the following sections. 16 Bit DAC A Opamp based Precision constant current source. An instrumentation amplifier based current and voltgae sense. A precision 5V voltage reference. Working When the user sets the required current on the microcontroller, the controller converts the same into an equivalent DAC value and sends it to the…
  • Figure:8 Low Power Audio Amplifier Circuit

    Audio Amplifier Circuit using 555 Timer

    Posted Sep 27, 2014 By Sudheer Gupta
    In this article we are describing the principle, design and operation of a low power audio amplifier using 555 Timer. The 555 Timer generates a carrier signal, which is modulated by the amplified audio signal to produce a modulated signal. This signal is used to drive a small loudspeaker. Low Power Audio Amplifier Circuit Here this circuit is based on the principle of audio amplification…
  • Figure:9 Digital Stopwatch Circuit Diagram

    Digital Stop Watch Circuit

    Posted Sep 21, 2014 By Sudheer Gupta
    This article describes the principle, design and operation of a digital stopwatch circuit. A digital stopwatch can be a circuit displaying the actual time in minutes, hours and seconds or a circuit displaying the number of clock pulses. Here we design the second type wherein the circuit displays count from 0 to 59, representing a 60 second time interval. In other words here the circuit displays…
  • Figure:10 Lamp Life Extender by ZVS (Zero Voltage Switching)

    Lamp Life Extender by ZVS (Zero Voltage Switching)

    Posted Sep 10, 2014 By Ravi Kumar
    This project is designed to develop a device to increase the life of incandescent lamps. Incandescent lamps exhibit very low resistance in cold condition due to which it draws high current while switched ON, resulting in fast failure.

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