in other words power must turn on and ramp time to operating level must be somewhere between 100 micro seconds and 10 milliseconds. this is accomplished easily with power conditioning between hardware and supply voltage. My first digital project is still operating in niagara falls ontario up on the wall in 2 of the more popular museums. the record fastest drumbeat in the world was held by "some guy" and was around 127 beats per minute. the brains of the project was a microcode 16f84, and 17f84. the 16f drove the display and fed alphnumeric while the 17f counted beats on a piezo electric drum pad and compared to the "record" beat. the skin of the finished project was slick, the inside was a fibreglass bread board. $1500 pricetag at time of release for $150 in parts and some brainwork.