The circuit was conventionally designed with eight LED audio level meter made out of two low power quad op-amps which utilizes LM324. Volume Unit – an entity equal to a decibel for expressing the ...
The LM324 low-voltage quad op-amp is decades-old design that it refuses to die – because it subtler characteristics are just so useful. For example, it works single-supply from 3V to 30V, its inputs ...
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