This circuit can easily be assembled on a small piece of prototyping board. Use low-current types for the LEDs. They have a low forward voltage and are fairly bright at current levels as low as 1 mA.
Silent Light - Classroom Timer and Decibel Meter is a new app from the folks at Top Storey Apps. It was written by a pair of teachers for teachers to use in the classroom or homeschool environment.
Today we are looking at the best decibel meter app to measure noise levels. Do you work in a loud factory and want to see just how much damage is happening to your ears when you “forget” your earplugs ...
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