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SMS Based Water Supply Alert Circuit

In this post we are going to construct a circuit which will notify the user via SMS if the water supply to you area / home is initiated. It can show the time when the water is begin to supply and...

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3kva Transformerless Inverter Circuit

The post helps us to design a relatively simple transformerless 3kva inverter circuit using a full bridge IC network and a SPWM generator circuit. The idea was requested by Mr. Ralph Wiechert   The...

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How to Repair an SMPS Circuit

In this post we try to diagnose a burnt SMPS circuit and try to troubleshoot and repair the circuit. The shown unit is a cheap readymade Chinese make SMPS circuit. This article is written as per the...

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Stopwatch Using Arduino with 7 Segment Display

In this post we are going to construct a stopwatch circuit using 7 segment LED display and Arduino. We will be exploring the concepts related to interrupts and display driver ICs which are crucial for...

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What is Constant Current Source

In this post we try to analyze what is constant current source and how it affects a load, or how it may be used with a load correctly for achieving the most efficient results. The following discussion...

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Patient Drip Empty Warning Indicator Circuit

In this post we will learn about a simple mechanism, and a circuit which will enable a patient's IV drip bottle system to sound an alarm whenever it gets almost empty, and needs a replacement. The...

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LM317 LM338 Calculator

This LM317, LM338 calculator software is used as a tool to determine the value of the voltage adjusting resistor needed to assign the output of an LM317 to an allocated degree. Normally R1 is 220 ohms...

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Capacitance Calculator

Capacitive reactance is an opposition to the change of voltage across an element. Capacitive reactance XC is inversely proportional to the signal frequency f (or angular frequency ω) and the...

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Reactance Calculator

Calculate the reactance XC by selecting a preferred value of the capacitor C and the frequency f. Capacitive reactance (symbol XC) may be defined as a measure of a capacitor's opposition to AC...

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Mosquito Bat without Battery

This simple homemade mosquito swatter bat neither requires a circuit nor a battery for the operation. The entire design works using a single high voltage capacitor and through quick charging from mains...

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SMS Based Pump Controller with Automatic Dry Run Shut Off

In this post we are going to construct a SMS based water pump controller with automatic shutdown of pump when no water flow through the pump is detected.  We will also construct another much simpler...

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Incubator Using Arduino with Automatic Temperature and Humidity control

In this post we are going to construct an incubator using Arduino which can self-regulate its temperature and humidity. This project was suggested by Mr. Imran yousaf who is an avid reader of this...

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Automatic School/College Bell System Using Arduino

In this post we are going to construct an automatic school bell/college bell system using Arduino, 16 x 2 display and real time clock module. You can program this project to ring the bell up to 16...

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RFID based Attendance System Using Arduino

In this post we are going to construct a RFID based attendance system, which can record attendance of 12 students / staffs for a given time window and this system can record up to 255 attendances per...

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3D Moon-Sphere LED Driver with Charger and Dimmer Circuit

In this post we learn how to build a homemade LED driver with dimmer and charger circuit for illuminating a 3D moon from a 5V USB source. The idea was requested by Mr. John Sweden. Requesting an LED...

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Simple Transistor Diode Tester Circuit

In this post we learn how to make a simple yet efficient transistor/diode tester circuit, that will not only test the quality of a BJT, but will also help to identify whether it is is an NPN or a PNP....

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Introduction to I2C LCD Adapter Module

In this post we are going take a look at “I2C” or “IIC” or “I square C” based LCD adapter module, which will reduce wire connections between Arduino and LCD display to just 2 wires, also saving tons of...

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IR Remote Control Range Extender Circuit

In this post we will learn how to increase or extend the range of an ordinary infra red or IR remote control through a 433MHz RF remote control system. IR Range Extender Concept The idea of this...

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400V 40A Darlington Power Transistor Datasheet Specifications

In this post we investigate the datasheet and technical specifications of a 400V, 40A (ampere) power Darlington transistor MJ10022 and MJ10023, and also learn the main features of the device. We mostly...

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Cell Phone Ring to Flashing Lamp Indicator for People with Hearing Loss

The post explains a simple sound to flashing lamp circuit which can be used for facilitating people with hearing loss, so that they are able to visualize a distant cell phone rings through flashing of...

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