| Author | Message | | | eric | | Posted: Mon Aug 28, 2006 12:12 pm Post subject: Long-Interval Timer | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | G. Ruschitzka
Occasionally there is a need for a timer circuit for tasks such as
switching off a circuit element (such as an LC display) after a
given interval or generating a time delay for an application.
Short intervals can be conveniently generated using a 555
timer, but if the switch-off time lies in the range of minutes or
longer, a 555 is no longer suitable due to the large value
required for the capacitor, which leads to inaccuracies or instability.
In such cases, a digital counter circuit with an oscillator
is a better solution.
The 74HCT4060 IC, with its built-in oscillator, can cover a wide
range of frequencies in a simple and reliable manner and can
also generate very low frequencies. The 14-bit divider chain
can divide the oscillator frequency by up to 16,384, which
makes it easy to obtain long time intervals.
The circuit presented
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