I want to build a countdown timer using 3 x 7 segment led displays
I want it to count down from 120 to 0
I shall provide the pulses to operate the counter , 1 pulse per second
At the end of the countdown the counter can sit at 0 or reset to 120
or be manually reset to 120 by a single operation/switch
I apologise if this info is readily available but I can't find a circuit diagram for this.
I see there is a circuit diagram for a 9 to 0 countdown on this site perhaps that could be modified, but I'm a novice and it's beyond me as yet.
A circuit digram for the above or perhaps a book where I can find a suitable circuit would be a great help.
thanks Alan
I want it to count down from 120 to 0
I shall provide the pulses to operate the counter , 1 pulse per second
At the end of the countdown the counter can sit at 0 or reset to 120
or be manually reset to 120 by a single operation/switch
I apologise if this info is readily available but I can't find a circuit diagram for this.
I see there is a circuit diagram for a 9 to 0 countdown on this site perhaps that could be modified, but I'm a novice and it's beyond me as yet.
A circuit digram for the above or perhaps a book where I can find a suitable circuit would be a great help.
thanks Alan