This LDR Light Sensor Circuit using BC547 works by itself. When it is dark the LED turns ON. When light comes then LED turns OFF. LDR feels the light and controls the LED. No need to press any switch. Circuit is simple and is with very low cost. It is good for small night lamp […]
Transistor Circuits
Sound And Light Metronome Circuit using Transistors
Music needs rhythm. A metronome helps us keep that rhythm perfect. This small project for Sound And Light Metronome Circuit using Transistors turns light into beat. When light changes then sound speed also change. It is simple, fun and easy to build. What is Metronome: Metronome is small device that gives steady beat. It makes […]
Simple Human Touch Sensor Circuit with Transistor
A human touch can do magic! This Simple Human Touch Sensor Circuit with Transistor shows how a tiny finger touch can switch ON a light. No switch, no button just a skin current makes it work. It is a cool and educational mini project for learners. Circuit Working: Parts List: Component Name Specification Quantity Resistor […]
Logic XNOR Gate Circuit with Transistors
XNOR gate is one of the basic logic gates. It gives HIGH output when both inputs are same. If both inputs are 0 or both are 1 then output is 1. If one input is 0 and other is 1 then output is 0. It is also called an “Equivalence Gate”. This Logic XNOR Gate […]
Logic XOR Gate Circuit with Transistors
This is project is for Logic XOR Gate Circuit with Transistors It uses transistors and resistors. It shows how XOR logic works. Output is high only when inputs are different. Good for students and beginners to learn digital logic. Truth Table for Logic XOR Gate: Input A Input B Output Y (A ⊕ B) 0 […]
Logic NOR Gate Circuit with Transistors
NOR gate is a universal logic gate. It gives output HIGH only when all inputs are LOW. It performs both OR and NOT operation together. In this circuit two NPN transistors are used to make NOR logic. Truth Table for Logic NOR Gate: Input A Input B Output Y 0 0 1 0 1 0 […]