Early work on a timer circuit for measuring the velocity of a cork or tennis ball in our air cannons. A 74C926N counter is driven by a 555 timer running at a known (93Hz) frequency. A second 555 timer in monostable mode is used to start (trigger) and stop (reset) the clock generator (first 555) with negative pulses from photo transistor/IR LED gates located on the barrel.Sunday, January 25, 2009
Timer Circuit Prototype
Early work on a timer circuit for measuring the velocity of a cork or tennis ball in our air cannons. A 74C926N counter is driven by a 555 timer running at a known (93Hz) frequency. A second 555 timer in monostable mode is used to start (trigger) and stop (reset) the clock generator (first 555) with negative pulses from photo transistor/IR LED gates located on the barrel.
