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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