I picked the LM324 for pedagogic reasons
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In real life, you’d use actual LED drivers
The layout, such as it is, made those short, direct wires possible
There’s nothing too complicated about any of that.
This is a tweak to the previous design, based on some road testing.
The HT’s mic input is galvanically isolated from the rest of the circuit board.
The Smell of Molten Projects in the Morning 