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Multiplexer and Demultiplexer:​

A multiplexer is a circuit that accepts many inputs but gives only one output whereas a demultiplexer accepts only one input and gives many outputs. Get an idea about their circuit diagram and pin diagrams in this post.

 

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This is a circuit diagram of 7805 IC which is a 5v DC regulated IC. It is very flexible and is employed in many circuits like a voltage regulator.

 

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We are all well known that NOT, AND, OR are the basic logic gates. Here we have shown how to design these basic logic gates using one of the universal gates – the NAND Gate.

 

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Here, we have shown how to construct the basic logic gates – NOT, AND, OR gates using NOR Gate which is one of the universal gates.

 

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This circuit produces a sound similar to the police siren. You may also get detailed information about the pin diagram and internal block diagram of the NE555 timer

 

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A power amplifier circuit using MOSFET has been designed to produce 100W output to drive a load of about 8 Ohms.

 

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Digital Voltmeter Circuit using ICL7107:​

Here we designed an analog to digital converter working as a digital voltmeter using a low power three and a half digit A/D converter ICL7107 having internal 7 segment decoders, display drivers, a reference, and a clock

 

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We built the circuit using a microcontroller which scans the input from push buttons and displays the corresponding number on a display device.

 

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The main principle of this circuit is to increment the values on seven segment displays by pressing the button. This circuit can be mainly used in scoreboards.

 

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The objective of this circuit is to indicate left or right turn for bike/vehicle. Two identical circuits are needed, one is for the left and the other is for the right. The main heart of this circuit is 555 timer.

 

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This is a simple automatic changeover circuit in which DC load like a series of LEDs are driven either by a battery or an AC-DC power supply.

 

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This is a simple up/down fading LED light circuit that can be used in shopping malls, homes, and security applications

 

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This circuit simulates the police car lights by alternate flashing. It flashes red LEDs three times and blue LEDs three times. This flashing action performs continuously, and this uses 555 timers and a decade counter

 

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Here is a simple DC Motor speed control circuit designed using AVR Microcontroller. Here we use a technique called PWM (pulse width modulation) to control the speed of the DC motor.

 

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This is ding dong sound generator circuit is designed using 555 timer IC in astable mode. It can be used as the doorbell. With some modifications, it can be used to produce different sounds. Read this post for complete details.

 

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This article explains a PIR based security system in which a PIR sensor is used instead of a transmitter or receiver. This saves power consumption and is low cost. This circuit can be used in museums to protect valuable things.

 

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This proposed TV jammer circuit confuses the infrared receiver in a TV by producing a constant signal that interferes with the remote control signal. If you switch on the circuit once, the TV will not receive any command from the remote. This allows you to watch your own program without anyone changing the channel or volume

 

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This circuit is designed to alert the user when an intruder enters the home. If there is any obstacle in front of the IR sensor, it generates an interrupt signal. This interrupt signal is given to the speaker to alert the user.

 

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Here we have used RF434 MHz modules to make a wireless remote. Using this remote, we can control the appliances within a range of 100 meters. It is used for remote control applications like burglar alarm, car door alarm, calling bell, security systems, etc.

 

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This high and low voltage cutoff with a delay alarm circuit is an advanced automatic voltage stabilizer circuit and is used to protect our home appliances. Its cost is less as compared to voltage stabilizers.