I have a correction on this one "digital signal" needs proper voltage regulator, the word digital may just look to us 1's and 0's, Yes it produce less noise than analog circuits but it also needs a less noise power source. Take note of the word signal. A signal could mean radio signal, sound signal, computer signal in our own easy term, which deals with speed or power commonly named as Mega Watts in power ang Mega Hertz in speed, this two example needs a good regulated steady state AC and DC supply to support its expencieve circuitry. An example in theory is a 100% radio frequency modulated signal in which at a 1 kilometer distance from the transmitter only 10% will reach at that point, that,s in a line of sight computation in which wala pa gi subtract ang signal lost cause by obsraction sa ana na 10%, In ana ka important ang regulated power supply sa digital signals, Sa ma recall naku before sa ga skwela pako wa gyud ko ka gamit ug signal generator nga dili regulated power suppy ang nag power. So for me lang ha i dunno sa uban ha , its wrong gyud to say nga "dili kaayo sila kinahanglan ug maayo nga regulation" ang digital signals.