Schematic DIY KitTimer Circuits Time measurement and interval
eg for exposure in a darkroom, or for control of lighting (switch), see these links interesting circuits

Here you will find Schematic Circuit Diagram for DIY and further information on Timer Circuits
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Timer for exposure of plates or in a darkroom www.geocities.com/tjacodesign/timer/timer.html
Stopwatch, with IC's built (CMOS) and LED display www.electronics-lab.com/projects/oscillators_timers/015/index.html

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