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Joule Thief: Basic Circuit, Upgrade to 24 LEDs, 1 to 1 Toroid Winding

The basic circuit using the 2n2222 metal can transistor, with a few alterations from the “instruction” video, to show the next steps in development. I’ve tested a few different coils and this 1::1 toroid…

Arduino: LED Twinkler: Basic Analog Input, Digital Output, PWM

The Arduino is a flexible platform for controlling all kinds of devices from all kinds of input signals. Here I demonstrate the most basic Analog Input — a voltage from a potentiometer — and…