Perfect Electronics has recently developed a programmable bell for use in institutes or industries. It includes a built-in clock. Maximum 16 timings can be fed to the unit. If one selects a weekly program mode, then the same timings for every day will be accepted. It is possible to omit Sunday from the weekly schedule. Of any two consecutive timings, the difference should be minimum one minute and maximum 23 hours, 59 minutes. A 10 second delay for every time is given so that bell will sound only for 10 seconds. However this delay time can be changed. So no person is required to sound the bell. If the mains power fails, the bell will not sound but the built-in clock operates on back-up cell and the programmed times will not be disturbed. UPS or EPS can be used with this system so that bell will sound during the mains failure.
