Why there is humming noise in transformer.
Transformer makes some noise like humming or buzzing. In some case the noise is very much loud. This is mainly because of dc offset current in the supply current and…
Insulation resistance test of alternator – how to do safely.
The insulation resistance test of alternator is very important. The IR test must be done in regular interval of minimum 6 month. Plus any time IR test may be needed…
The I2C Bus: Hardware Implementation Details
Essential information for understanding and designing the hardware needed for an I2C bus. Sometimes a Little Complexity Is a Good Thing The I2C protocol is notable for some less-than-straightforward characteristics:…
Introduction to Capacitive Touch Sensing
In this article, we will take a detailed (but not too detailed) look at the electrical principles that allow us to detect the presence of a human finger using little…
How Low Can You Go? Measuring Small Voltages with a DMM
Understanding the relationship between resolution and accuracy will help you determine how small a voltage, current, or resistance—or how small a change in those values—you can actually measure with your…
Analysis of Forward Conducting Diodes
In this article, we will learn how to analyze circuits that utilize forward conducting diodes. We will also talk about the exponential model, constant voltage drop model, as well as the ideal…
Major considerations in Electrical Machine Design
The basic components of all electromagnetic apparatus are the field and armature windings supported by dielectric or insulation, cooling system and mechanical parts. Therefore, the factors for consideration in the…
Insulation resistance test- 9 safety tips to follow.
Safety is a sense. No instrument or tools can guarantee safety. Only safe practice and quality tools can ensure the safety. When you are to do insulation resistance test there…
What is Power Correction Factor for Transformers
Correction or improvement of the power factor of electrical equipment like transformers is done to reduce the required electric power and thereby save electricity. Here, we discuss how the power…
Circuits and Techniques for Implementing Capacitive Touch Sensing
This article presents some basic cap-sense circuit configurations and discusses how to deal with low- and high-frequency noise. Measuring Change If you’ve read the previous article, you know that the…
