Use pin 7 of the fifth 7490 for the 24-hour European clock. Use pin 6 of the fifth 7490 for the American 12-hour clock. Connect pin 6 or pin 7 of the fifth 7490 as the clocking input of the sixth 7490.Wire the wiper of the switch to the clock input of the fifth 7490. Wire the normally open contact of the switch to the 1 Hz time base. Wire the output from pin 8 of the fourth 7490 to the normally closed contact of a single pole double throw switch. LEVGRY Emoji Alarm Clock,Digital Clock,Smart Childrens Clock, Student Bedside Night Light, Multi-Function Electronic Alarm,Alarm Clock for Heavy Sleepers Adults Kids (White), 4.13 x 4.33 x 3.66 in 3. Provide the ability to set the hours section of the counter.This 7490 is the tens of minutes counter. Wire pin 11 of the third 7490 as the clocking input of the fourth 7490.Wire the wiper of the switch to the clock input of the third 7490. Wire the output from pin 8 of the second 7490 to the normally closed contact of a single pole double throw switch. Provide the ability to set the minutes section of the counter.This 7490 is the tens of seconds counter.
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