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BASIC timer I

Based on a Labs project | October 2011 | Find it here
BASIC timer I
The time-determining element in the present circuit is capacitor C1, which is charged via a current source based on T1. The voltage across the capacitor is, therefore, a ramp. A comparison of this ramp with apreset voltage gives a fairly accurate time indication. With values shown in the present circuit, that time lies between 1 and 10 minutes.
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