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Digital Stopwatch Circuit Diagram Using ICs We are going to construct a digital stopwatch circuit using 7 segment LED display and digital ICs like IC 4026 and IC 4017, this digital stopwatch also features milliseconds count. We will see: What is Stopwatch? The Design of Digital Stopwatch. IC 4026 Pin Diagram and Explanation. IC 4017 Pin Diagram and Explanation. IC555 Pin Diagram and Explanation. Block Diagram of Stopwatch. Common Cathode Display Connection Diagram. How to operate the Stopwatch . What is Stopwatch? Stopwatch is a timer which is used to measure an event anywhere from milliseconds to several hours. We can start and stop the count of the stopwatch at any instant and also can be reset to zero to measure the timing of a new event. Stopwatch needs no introduction; we use them at many points of our life to measure timings for several purposes like: During cooking to avoid the food to either overcooked or undercooked, during a sport event or eve
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Simple 12V to 230VAC Inverter Circuit – MOSFET In this post we are going to construct a simplest 12VDC to 230VAC inverter using transistor and MOSFETs. We will learn: Different Stages in an Inverter Circuit. Circuit Diagram of the Inverter. Analysis of this Inverter’s Waveform. Understanding Astable Multivibrator. Maximum Power Output of an Inverter. Advantages and Disadvantages of this Inverter. Power Inverters need no introduction; we use them when there is a power cut or in an emergency situation or simply you are on a camp. Power inverters can deliver power anywhere between 10 watts to 10000 watts depending on your needs and inverters can also be single phase or three phase  depending on your application. Inverters can be with any specifications, but a standard inverter has these important stages: Stages of an Inverter: Power source i.e. battery Oscillator Driving Stage Transformer Let’s explore one by one: Battery / DC Power source:
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How to Make a Walkie Talkie Circuit

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In this post we are going to make simple Walkie talkie circuit project which can send and receive voice over FM frequency band with range of 250 meters. You can make this as a toy or use it for real life applications if you build it durable enough. Note: Please follow your country’s wireless regulation strictly while using this project. We will see: Explaining the idea. Transmitter Circuit Diagram. Transmitter Circuit Explanation. Different voice modes. The Receiver. How to use this Walkie talkie. The Idea: This project utilizes FM radio as receiver and FM transmitter to send voice. A person who wants to communicate with the other will have a set of FM radio and FM transmitter and same with the other person. Let’s consider two persons ‘A’ and ‘B’ and they want to communicate: Block Diagram for Walkie Talkie Here, the person A’s receiver frequency is tuned to person B’s transmitter and person B’s receiver frequency is tuned to person A’s transmitter. You
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Digital Clock Circuit Using IC 555 and IC 4026In this post we are going to build a 12 hour – 7 segment display digital clock without any microcontroller. We will be using only basic CMOS ICs and pure logic to build the circuit, yet this circuit can be easily replicated by beginners in electronics. We will see: Main Circuit Diagram. Pulse Generator for Digital Clock. IC 4026 Pin Configuration. IC 4017 Pin Configuration. IC 7408 AND Gate Pin Configuration. How to Set Time. How to Wire the Circuit Easily. Circuit Diagram for 7 Segment Display Digital Clock: Download high resolution image of the above circuit diagram:  click here Circuit Description: The above circuit consists of 4 seven segment display driver IC 4026 which can display 0 to 9 on common cathode 7 segment display, one IC controls one 7 segment display. There are three IC 4017 which are decade counters, it tracks the time and reset the IC 4026’s count to “00” when the minute digit reaches 60.
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