This is a small board with 16 LEDs and pairs of switches for exercising digital circuits. It can draw power from the circuit under test, or it can use USB-C. It's intended to run at 5V, but the high-level threshold for AHCT logic (the LEDs are buffered by two 74AHCT240s) is wide enough that it might work at 3.3V as well. Pullup/pulldown is selectable for each group of 8 outputs (and can be disabled if you want the outputs to float), and you can use either the DIP switch or the pushbutton to set an input, whichever is more convenient.
Components are all surface-mount, and chosen so that JLCPCB should be able to fab the whole thing (including assembly).
KiCad build files available on GitLab; see the link below.
The boards arrived last week...took hardly any time at all for them to be assembled and shipped. I'm keeping one for myself, but if you're looking for a simple way to monitor a bunch of logic lines (or maybe you just want to add a row of blinkenlights to your retrocomputer project), maybe you might be interested in buying one of my extras.