This is probably what the one for the masses to build would look like. In order for it not to get really large, I did keep SMT for the op-amp, but it's a SOIC with leads spaced a 1.27mm, they're pretty easy to solder. Functionally, it would be identical to the SMT version I posted previously. It also is the same schematic as the SMT version, just the device footprints are different.
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