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Sound level meter circuit diagrams
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August 8, 2010
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so... [more]
August 8, 2010
‘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... [more]
circuit from:http://www.extremecircuits.net/2010/04/save-your-ears-noise-meter-circuit.html
July 2, 2010
This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control... [more]
June 22, 2010
This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range. [more]
April 25, 2010
The circuit accosted in those who they want a Vumeter that will be connected in the exit of power amplifier. [more]
April 13, 2010
A simple circuit peak indicator of tops of musical signal. Each time where the level of signal exceeds the level + 4dB, turns on led D1. It is useful in each channel of console of... [more]
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