| 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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