| Constructional Project Kitchen Timer THERE are many simple operations in a kitchen which require short timing intervals without constant attention, and simply needing a signal to alert the user that the operation has been completed. Such devices are available in the shops, including electronic timers featuring crystal controlled timing with l.c.d. displays. But if such sophistication is not really needed, it can still be almost as cheap to build your own, and much more fun! The timer described here can be set for periods of up to nine minutes in one minute increments, but a simple component change can result in, say, a 4·5 minute period in 30 second increments, or 18 minutes in two minute increments. Longer periods are impractical unless the timing is repeated or the clock oscillator redesigned. The elapsed time is displayed to the nearest minute and an alarm indicates the end of the period. |
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