This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores.
An analog VU (volume unit) meter is a splendid moving-coil measuring instrument. It is a passive electromechanical device displaying a representation of the signal level in an audio equipment. Even ...
It used to be a must-have on any hi-fi, a pair of moving coil meters or LED bar graphs, the VU meter. Your 1980s boombox would have had them, for example. VU, for “Volume Units”, is a measure of audio ...
The unbridled development of radio broadcasting in the 1920s and 1930s demonstrated the need to standardize audio equipment, studio-to-transmitter links, and methods for measuring static and dynamic ...
MARY GRUSZKA As live audio mixers or post-production editors, we are accustomed to using VU meters or peak program meters (PPMs) to set and maintain desired levels. But now with the CALM Act on the ...
Before starting Techaeris, I didn’t think too much about headphones, like many people I just picked up a pair of cheap buds and went about my day. It wasn’t until I started testing headphones of ...
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