So much for theory and design. Here’s a built-up version of the voltmeter:
It was built as add-on for the RF Node Watcher, here’s the side view of this sandwich:
Everything was built with through-hole parts, the LM324 and LT1413 op-amp chips (quad and dual, respectively) were mounted on the bottom, to provide easy access to all their pins from the top and allow simple experimentation & soldering. The ST232C chip was mounted in a free spot, with the 4x 0.
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