Bright light alarm circuit using active buzzer Light Dependent Resistor LDR 2N3904 NPN BJT

#145 - Lighting an LED With Your Finger (Using a 2N3904 Transistor!)

2N3904 BJT Pin Layout Bipolar Junction Transistor #transistor #electronics #diy

Simple way to make continuity tester circuit using a Transistor 2N3904 and Buzzer

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Great Idea to make LED flasher circuit using Capacitor and 2N3904 transistor on Breadboard