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Tutorials for Electronic Students & Hobbyists

Free electronics tutorials and downloads teach basic to advanced theories and concepts. Please bookmark us and check back frequently. We will be adding new articles and downloads continuously.

How to select an AC to DC power adapter (web tutorial)
This free tutorial explains how to choose the best AC to DC power adapter for your needs.

PDF icon ApogeeKits illustrated guide to electronic soldering (.pdf download tutorial 310 KB)
Free electronic soldering tutorial explains beginner to advanced soldering concepts. Last updated Oct. 29, 2013.

Frequency Counter Construction Article (web tutorial)
A free frequency counter construction tutorial including circuit schematics, PCB foil patterns, silk screen part placement, and digital source code.
Best of all, this frequency counter is available as an electronic kit with no programming requirements.

Astable Multivibrator Theory of Operation (web tutorial) This simple digital "flip flop" circuit provides the basis of how digital circuits operate. From timing and clock circuits (digital oscillators), to digital switches, and just about everything computerized in the modern world.

Lie Detector Theory of Operation (web tutorial) Explains how a basic lie detector works by detecting changes in skin resistance of the person being tested for lies.