PROGRAMMABLE_TIMER_SEQUENCER

  
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The circuit diagram of this programmable sequencer could be applied in a number of timing uses. Prior to the start of each interval, an audible tone is generated, and a seven-segment LED display shows the interval number. Prior to the end of that inerval, the buzzer sounds again. IC1 is a 2240 timer/counter device that clocks up to 256 periods, the durations..
PROGRAMMABLE_TIMER_SEQUENCER - schematic




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