Category Archives: Building blocks

Components: LM386 audio amplifier

Posted on 2026-03-30 by M. Eric Carr

The LM386 audio amplifier is a convenient way to add a speaker amp to electronics projects. Continue reading →

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Quadrature Encoders

Posted on 2022-06-30 by M. Eric Carr

Quadrature rotary encoders are inexpensive and very easy to wire up. Here’s how to use them with interrupts in Arduino C for ESP32. Continue reading →

Posted in Arduino, Building blocks, Digital, Electronics, HOW-TO, User Interface Design | Tagged , , , , , , , , , , , , | Leave a comment

The EBCs of BJTs

Posted on 2014-11-30 by M. Eric Carr

Bipolar Junction transistors (BJTs — NPN and PNP types) are inexpensive, reliable, relatively easy to use, and very useful. Here’s how they are used. Continue reading →

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Components: LEDs

Posted on 2014-05-30 by M. Eric Carr

LEDs are useful devices. They require a bit more thought to use than indicator lamps, but are very versatile and efficient. Continue reading →

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