LED Dimmer

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A transistor circuit that dims an LED with a potentiometer, using a 5 V supply, a 2N2222 transistor, and resistors.

Source book: Moving Rainbow
Kit page: https://dmccreary.github.io/moving-rainbow/kits/led-dimmer/
Printable one-pager: led-dimmer-one-pager.html

Features

• Uses the 10K Potentiometer

Benefits

• Free, open lessons: the Moving Rainbow textbook has the kit page, wiring, and MicroPython code.
• Try before you build: an interactive MicroSim on the kit page runs in the browser.
• Budget: about \(4–\)6 (estimate: breadboard $2, 2N2222 transistor, potentiometer, LED and resistors, each under $1).

Parts

• 10K Potentiometer — Input knob
• 830-Point Breadboard ($1.10) — Breadboard