In this post we learn how to make a simple automatic day night activated car headlamp circuit. The circuit uses a LDR for sensing darkness and daylight and results in […]
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 […]
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 […]
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 […]
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 […]
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 […]