Build Electronic Circuits

Electronics explained in a simple way

AC vs DC: The difference between alternating and direct current

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The difference between Alternating Current (AC) and Direct Current (DC) is simple: AC vs DC comes down to in which direction the current flows. AC is a current that alternates its direction. It goes back and forth continuously. DC is a current that flows in one direction.

Current flow in a DC circuit:

Animated gif that shows the flow of current in a DC circuit
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Simple VU-Meter Circuit

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I put together this Voltage Unit (VU) meter using LEDs on a breadboard the other day. It only has 4 LEDs, but can easily be expanded to more:

It’s basically a simple display for showing a value. It’s originally for showing signal level in audio circuits, but there’s no reason you can’t use it to show temperature, rain intensity, light level, or whatever other value you are measuring.

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End of year notes from Oyvind

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So I just realized today that it’s not only a new year we are entering into…

We’re entering into a new decade!

I’ve been teaching electronics for about ten years now.

And it’s been a crazy ride:

From teaching a small group of students as a teaching assistant at the University – to reaching millions of people through my books, articles, videos, newsletter, workshops and online courses.

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