I was building a logic circuitry that performs 8 bit multiplier 16 bit divider using decoders as finite state machine in breadboards. the circuit is a bit large and i wonder why grounds or low voltage doesn't spread to other part of the circuitry or ICs. When test with logic probe, the reading has noise and most of the time, there will be no reading.
I come to a point to try to short VCC and ground. This solves everything. The circuitry has grounds to the whole circuit or to all ICs. And also, LEDs have high brightness.
My question is in large circuits, why does ground not spread evenly to other ICs or other parts of the circuit? and What is the explanation of the ground and VCC shorting solve this problem?