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...
View Article3kva 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...
View ArticleHow 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...
View ArticleStopwatch 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...
View ArticleWhat 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...
View ArticlePatient 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...
View ArticleLM317 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...
View ArticleCapacitance 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...
View ArticleReactance 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...
View ArticleMosquito 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...
View ArticleSMS 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...
View ArticleIncubator 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...
View ArticleAutomatic 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...
View ArticleRFID 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...
View Article3D 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...
View ArticleSimple 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....
View ArticleIntroduction 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...
View ArticleIR 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...
View Article400V 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...
View ArticleCell 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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