Simple Infrared Thermopile Sensor Circuit Explained

A simple infrared thermopile sensor circuit diagram is shown underneath. The op amp must be a excellent low-noise unit. We usually make use of the LTC1050 for such purposes, however various other pin-compatible selections may be present and tried. (The all-pervasive 741 op amp is not going to be eligible as a “low-noise” substitute, although […]

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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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Thermal Indicator Circuit for Heatsinks

The post details how to build a simple 3 LED thermal indicator circuit for heatsinks and other similar applications to quickly understand the level of heat on the selected surface through a sequential 3 LED panel. The temperature of a heatsink can be measured with a wet finger: if it sizzles, the temperature is too […]

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Simple Temperature Indicator using BC547 Transistor

The post explains a simple temperature indicator circuit using a single BC547 transistor and complementary 1N4148 diode. The temperature indication of a heat sink on a power transistor in high power circuits can be extremely useful. A simple, inexpensive temperature indicator would be ideal for this purpose since accuracy is not an important factor. In […]

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Under Soil Gold Detector Circuit

The article talks about a surprisingly simple under soil gold detector circuit for estimating buried metals like gold, iron, tin, brass etc by detecting alternation in the resistance of the specific earth deposits. Larger physiological matter which can be hidden within the topsoil could possibly be discovered by means of a alteration in the electrical […]

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Simple Smoke Detector Circuit

A Smoke detector circuit is an essential system when it comes to maintain safety precaution for any establishment. Having a smoke detector installed makes life easy to save your establishment from any fire attack. Smoke detector is common these days and this project aim to detail the process to building the alert system. Smoke Detection […]

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Carbon Gauge Circuit

In this post we’ll see how to make a simple carbon gauge circuit for measuring carbon emission level of an automobile exhaust system. Measuring carbon is common usage in the field of transportation. As the world has crowded with increasing number of vehicles plying every day, the increase of carbon has become a major point […]

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Simple Touch Switch Circuit using IC 4017

A surprisingly simple touch sensor switch circuit could in fact be constructed utilizing just one IC 4017 together with a couple of supplementary passive elements, the method is spelled out in the next paragraphs . Looking at the below presented circuit diagram for the suggested simple touch sensor switch, we are able to notice that […]

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AC Mains Current Detector Circuit

This AC mains current detector circuit identifies current levels within one of the AC mains supplies with the aid of an inductive pickup sensor (L1) made using a one inch diameter U-bolt wrapped with eight hundred spins of 30 SWG super enameled wire. It senses AC mains line currents of approximately 200 mA or maybe […]

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