Under this post we investigate 4 simple 220V Mains Uninterruptible power supply (UPS) designs using 12V battery, which can be understood and constructed by any new enthusiast. These circuits can […]
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NiMH Battery Charger Circuit
A single state-of-the-art chip, a transistor and a few other inexpensive passive components are the only materials required for making this outstanding, self regulating, over charge controlled, automatic NiMH battery […]
Variable Voltage, Current Power Supply Circuit Using Transistor 2N3055
In this post we learn how to make a simple variable power supply circuit using transistor 2N3055 and some other passive components. It includes variable voltage and variable current feature, […]
Hi-Fi 100 Watt Amplifier Circuit Using 2N3055 Transistors – Mini Crescendo
Video Demonstration of the Crescendo Amplifier The mini crescendo 100 watt transistorized amplifier circuit explained here was built and tested by me and am extremely pleased by its performance and […]
Highly Sensitive Mobile Phone Detector Circuit
A cellphone or mobile phone detector is actually a high gain op amp amplifier which detects slightest of RF disturbance from a mobile phone, and illuminates an LED. NOTE: This […]
How to Make Car LED Chasing Tail Light, Brake Light Circuit
The circuit explained here is presented in response to a request sent by one of the avid readers of this blog. The proposed circuit is of a sequential LED light […]