The glove uses light-gun sensors on each finger. I designed my own circuit because I couldn't round up five NES zappers. Cloning the zapper wasn't an option because the IR3T07A chip it uses has been out of production for decades.

The circuit uses two stages of edge detectors and amplifiers: Detecting the edge of an edge to produce an output pulse about 0.6 μs long.

I'm not 100% satisfied with this circuit. It uses five transistors. I feel like I should be able to reduce it to four.

The phototransistors are wrapped in heat-shrink tubing. This isn't just to protect the wires. The detector circuits will not work without it. They need a sharp pulse when the raster beam is pointed directly at the phototransistor. The pulse rises more gradually without the tubing because the phototransistor picks up the raster beam from the side as it approaches.