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List of Electronics Mini Project Circuits – Part 3

100w Subwoofer Amplifier Circuit: Here is the circuit diagram and working of 100w subwoofer amplifier circuit. A Subwoofer is a loudspeaker which produces audio signals of low frequencies.
DTMF Based Home Automation System Circuit: This is a simple and very useful circuit in our real life named DTMF controlled home appliances system. It helps to control the home appliances using DTMF technology.
Street Lights that Glow on Detecting Vehicle Movement: This article describes about the circuit that switches the street lights on detecting vehicle movement and remains off after fixed time. This system controls the street lights using light dependent resistor and PIR sensor.
555 Timer IC Testing Circuit: This is a simple 555 IC testing-circuit which tests your entire 555 timer IC. So before using your IC, you may check whether your IC is good or bad by using this circuit.
Curtain Opener/Closer Circuit: This circuit will open and close the curtain of your home and office just by pushing a switch. So with the help of this unique circuit, we do not need to move from one place to open and close the curtain.
Variable Power Supply and Charger: This is a circuit which helps to check or test your electronic projects and also to charge the Mobile phone batteries. This circuit can also work as an emergency light.
LED Running Lights Circuit: This is a simple circuit consists of 9 LED lights in knight rider scanner mode. It will present an eye catching look as the LED initially travel in the one way and then travel reverse in the similar direction.
Luggage Security Alarm: This is a simple alarm circuit which helps in ringing a warning alarm when someone tries to steal the luggage.
9 Way Clap Switch Circuit: This circuit helps you to manage your appliances in your home by just clap without moving from your bed.
12V to 24V DC Converter Circuit: This is another kind of circuit which helps to convert 12V DC current to 24V DC current.
Bidirectional Visitor Counter using 8051: This Bidrectional Visitor Counter Circuit is helpful to count the number of persons entering or leaving a room and to display it on a screen.
230V LED Driver: Here we design a simple circuit driving a series of LED from 230V AC. This is accomplished using a capacitor based power supply. This is a low cost and efficient circuit and can be used at homes.
3X3X3 LED Cube: This is a simple a simple LED cube circuit designed without using microcontroller. It is based on the principle of driving LEDs using the clock pulses.
Auto Intensity Control of Street Lights: This is a simple circuit that automatically controls the intensity of street lights which is designed using microcontroller and LEDs.
Line Following Robotic Circuit using ATMega8 Microcontroller: This line follower robot is a basic robot that follows a specific path indicated by a line having some particular width.
Monostable Multivibrator Circuit Operation: Here is the monostable multivibrator circuit diagram and working. Multivibrator is an electronic circuit which will work as two stage amplifier operating in both stable and astable mode.
Interfacing16X2 LCD with PIC Microcontroller: This is a circuit which helps in interfacing 16×2 LCD to PIC18F4550 microcontroller which is of family PIC18F.
Morse Code Generator Circuit: This is a circuit used to generate morse code. Morse code is very old and versatile technique to send text messages using wireless media.
555 Timer in Monostable Multivibrator Mode: The circuit is triggered by a falling edge, that is, by a sudden transition from HIGH to LOW. The trigger pulse, produced by pressing the button, must be of shorter duration than the intended output pulse.
555 Timer as an Astable Multivibrator: In this circuit, There are three resistors named R inside it and all have equal values. These form a voltage divider having reference voltages of 1/3 and 2/3 of Vcc (the power supply). The logic state of the flip flop is controlled by the reference voltage which is given to one of the inputs of both two comparators.
Mains Operated LED Light Circuit: This is a simple circuit which is more useful to save our resources, energy and money by installing in your homes.
LED Lamp Dimmer Circuit: In this circuit, at the starting LED glows slowly, then grown brighter and once again slowly it became dim. The basis of the whole circuit is an operational amplifier IC named LM358.
Variable Voltage Power Supply from Fixed Voltage Regulator: This Voltage regulator circuit is used to get fixed voltage at the output without depending on the input voltage.
LED Christmas Lights Circuit: This is a simple circuit used to decorate your house by building christmas lights using LEDs. The lights will get ON at night and OFF in morning time.
Audio Equalizer Circuit: The circuit is used to change the tune/melody into a different pitch level by devoid of loss in the tune. It is mainly useful to music lovers.


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