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 ...
VU (Volume Unit) meters are often included in analog audio equipments to display a signal level in Visual Units. We are building a mono input VU meter in this project. You can build one pair to use ...
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