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Circuits for Beginners
Electronic and Arduino circuits for beginners with Arduino sketches.
Also see the circuits in the beginner series of electronics and Arduino tutorials.
Arduino Buzzer Circuit
This article shows how to connect a buzzer to an Arduino when the buzzer operates at a different voltage to the Arduino such as 9V, 12V or some other voltage.
Arduino MEGA 24 LED Knight Rider Display
Build a Knight Rider LED chaser display using an Arduino Mega 2560. This breadboard circuit uses 24 LEDs in for the display.
Two Colour LED Flasher Transistor Circuit
This simple two transistor circuit flashes a common cathode tri-colour 3-pin LED two different colours (colors).