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VU meter DIY kit with LEDs | LM3915N-1 LED DRIVER

This time I bring an electronic kit for beginners, this is a very cheap and interesting device that displays audio levels ...

I Used a Watt Meter to Save Money on My Electric Bill. It Was Weirdly Fun—and Enlightening.

For example, to get an accurate cost reading on a refrigerator, you’ll want to leave it connected to the meter for at least ...