A Noise Meter Circuit::: save ears PCB


Posted on Feb 5, 2014

Circuit Hello HELLO! Are you deaf Do you have disco ears ` If people ask you this and you`re still well below 80, you may be suffering from hearing loss, which can come from (prolonged) listening to very loud music. You won`t notice how bad it is until it`s too late, and after that you won`t be able to hear your favorite music the way it real


A Noise Meter Circuit::: save ears PCB
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ly is so an expensive sound system is no longer a sound investment. To avoid all this, use the i-trixx sound meter to save your ears (and your neighbor`s ears!). With just a handful of components, you can build a simple but effective sound level meter for your sound system. This sort of circuit is also called a VU meter. The abbreviation VU` stands for volume unit`, which is used to express the average value of a music signal over a short time. The VU meter described here is what is called a passive` type. This means it does not need a separate power supply, since the power is provided by the input signal. This makes it easy to use: just connect it to the loudspeaker terminals (the polarity doesn`t matter) and you`re all set. The more LEDs that light up while the music is playing, the more you should be asking yourself how well you are treating your ears (and your neighbours` ears). Of course, this isn`t an accurately calibrated meter. The circuit design is too simple (and too inexpensive) for that. However, you can have a non-disco type (or your neighbors) tell you when the music is really too loud, and the maximum number of LED lit up at that time can serve you as a good reference for the maximum tolerable sound level. Although this is a passive VU meter, it contains active components in the form of two transistors and six FETs. Seven LEDs light up in steps to show how much power is being pumped into the loudspeaker. The...




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