In this post we are going to learn about strain gauge based load cell. We will be exploring what Strain Gauge is, what Load Cell is, temperature effect on strain gauge, temperature compensation with Wheatstone bridge and Load cell amplifier HX711, and finally we will learn how to build an Arduino based weighing scale machine Read More
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Solid State Contactor Circuit using Triacs and SCRs
In this article we learn how to design and build a solid state contactor circuit using triacs for operating heavy duty loads like submersible borewell pump motors with high reliability, and without any concerns about wear and tear issue or long term degradation issues of the contactor unit. What is a Contactor A contactor is Read More
Automatic PIR based Solar Home Lighting Circuit
The post explains a simple circuit using PIR, LDR for making an automatic solar LED lamp which can be used for illuminating your home automatically at sunset, and only in the presence of a human member in the premise. By SS Kopparthy Introduction Here, in this article, a simple yet useful and improved version of the Read More
Simple Milliohm Tester Circuit
I wanted a milliohm tester circuit that could be used to measure resistance on printed circuit boards to track down shorted components. I looked at several designs and combined several ideas into this project. By Henry Bowman Circuit Description Referring to the schematic, the milliohm tester is powered by two 9 volt dry cells. The Read More
Using Microwave Oven Parts to build a Soldering Iron Heat Controller
In this post we learn how to scavenge discarded microwave oven parts for making a useful soldering iron heat controller circuit which can then be used for maintaining controlled heat over a connected soldering iron tip ensuring safe soldering operations, that may be quite crucial and handy if you are working with SMD parts. By Read More
Simple Transformer Winding Tester Circuit
This test set is primarily designed to test step-down, step-up transformers, for open and shorted windings. It can determine if the device under test has a low resistance to ac current. It can also measure the dc current resistance in ohms. By Henry Bowman Introduction The test set uses a 16 VAC, 60hz signal to Read More