His ill-advised first try involved directly coupling two switches ... from a second pair of switches he wired up some resistor-capacitor networks on a breadboard and got the connecting to ...

An undesired voltage spike resulting from this capacitive coupling is commonly referred to as crosstalk. The presence of another nearby line will increase the total capacitance of the isolated line.

Further, where components or wires carry large switching currents, noise can be coupled by both magnetic and capacitive coupling. Other likely problem areas are output rectifiers; output ...