Design low-duty-cycle timer circuits

Designing astable circuits using the industry-standard 555 timer is a straightforward process when duty cycles are 50% or greater. However, you must overcome the many pitfalls of low-duty-cycle circuits to arrive at a desired result. This Design Idea uses

Logic IC yields simple, wide-range timer

you can use a 4060B binary counter/oscillator to make a simple, accurate, long-delay timer for times between milliseconds and hours.

8254 timer/counter board

The schematic, theory of operation, construction tips and parts lists

555 Timer Tutorials

Soem real handy circuits from Williamson Labs.

Amplifier timer

Timer provides power-off function

an interval from seconds to several minutes for automatic power-off switching in idle battery-powered systems.

LM555 timer chip datasheet

Appliance Timer