ELECTRONIC_PROJECTSCIRCUIT • DESIGN • BUILD
Connecting Circuits...
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This project demonstrates the design and implementation of a light-sensitive control switch using a phototransistor and an NPN BJT. The circuit automatically turns an LED ON or OFF depending on the ambient light intensity. When light falls on the phototransistor, it controls the base current of the BJT, allowing the transistor to operate as a switch. The project helps in understanding light-sensing circuits, transistor switching behavior, and basic sensor interfacing. It is a simple and practical application commonly used in automatic lighting systems such as street lights and night lamps.
This project is a hardware-based digital clock designed entirely using discrete logic circuits to deliver accurate and reliable performance. Timekeeping precision is achieved using a 32,768 Hz quartz crystal oscillator, with full support for both 12-hour and 24-hour display formats. The clock also integrates advanced features, including a dual normal/stopwatch mode, a hardware-level zero detection circuit for timer functionality, and a multiplexer-driven manual time-setting mechanism for seamless user control