The post explains a simple circuit using Passive Infrared or PIR for making an automatic solar LED lamp which can be used for illuminating your home automatically at sunset, and […]
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Simple Transformer Winding Tester Circuit
This test set is primarily designed to test step-down, step-up transformers, for open and shorted winding. It can determine if the device under test has a low resistance to ac […]
IC 555 Monostable Calculator
555 Timer Calculator This page is very useful when creating 555 timer circuits. it will allow you to calculate the frequency and duty cycle. Monostable 555 Timeout Calculator This calculator […]
How to Make a RFID based Attendance System
In this post we are going to construct a RFID based attendance system, which can record attendance of 12 students / staffs for a given time window and this system […]
How to Repair a Switch-Mode-Power-Supply (SMPS)
In this post we try to diagnose a burnt SMPS circuit and try to troubleshoot and repair the circuit. The shown unit is a cheap readymade Chinese make SMPS circuit. […]
3 Best Transformerless Inverter Circuits
As the name suggests, an inverter circuit that converts a DC input into AC without depending on an inductor or a transformer is called a transformerless inverter. Since an inductor […]