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LEAP#345 Boldport Club MOSTAP

The MOS TAP circuit was originally published in Elektor magazine in Feb 1975. It was an update or the original TTL Tap circuit to use “state-of-the-art” COSMOS (CMOS) components.

In practical terms, that means 4000-series logic instead of 7400-series logic.

The Boldport Club version of this venerable circuit makes an additional improvement by replacing the output stage BJT drivers with 2N7000 n-channel MOSFETs so that the project really does live up to it’s name!

I’ve added a few mods of my own - a mode switch and a test jig mounted on the beautiful Boldport box (too good to throw away).

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub


Here’s a quick demo: