Metal Detector Circuit using a Single IC

In this post we learn how to make a simplest metal detector circuit using a single CMOS IC 40106 Simple metal detector circuit The metal detection circuit displayed here might reveal the limitations of the simpleness of a metal detector, however the design performs remarkably well. It works with a single 40106 hexadecimal incinerator, a […]

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Non-Contact AC Mains Tester Circuit

The simple transistor based non contact AC mains tester circuit will allow you to test the presence of mains AC hum from a distance of about 3 inches. The LED and an optional buzzer will provide the required mains phase presence.   How the circuit Works As we can see in the above figure, 3 […]

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10 Channel Capacitive Touch Switch Circuit

In this article we are going to construct a capacitive touch switch circuit with 10 channel output, the state of the each channel can be turned ON and OFF sequentially by touching acoin sized metal plate. Capacitive touch is very commonly used in our smartphones, tablets or any gadgets which have touch screen. The term […]

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Non-Contact Voltage Detector Circuits Using Transistors and IC

In this post we are going to discuss a few non-contact voltage detector/tester circuits for checking the presence of active mains live wire. We will be understanding what non-contact voltage detector is, how it functions and how to make one using transistors and ICs. What is non-contact voltage detector? Non-contact voltage detectors are AC mains […]

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