A timer is a kind of clock for measuring timeintervals. A timer which counts upwards from zero for measuring time is often called a stopwatch. A device which counts down from a specified time interval is more usually called a timer. A simple example is an hourglass. Some timers sound an audiblealarm that the time is up. Time switches, timing mechanisms which activate a switch, are sometimes called "timers". view more...
Potato chip circuit/macrochip with 555 timer circuit