| Principle:
'Quartz Crystal' generates its own frequency.
Which is divided by CMOS frequency dividers
generating accurate time base. This signal is
given to synchronous counter which drives display.
The elapsed time is continuously compared with
reset time. At the set time output is generated
from driving relay.
The relay can be operated in 'Delayed On',
Delayed Off, 'Auto reset' modes as per the application.
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