Time delay circuit (555)

  
A very regular configuration of the 555 astable timer to work as a timer to trigger an alarm or any other equipment connected to pin 3. R resistor should be replaced with a potentiometer that will change the time delay. Capacitor C should be calculated too (there are many 555 calculators around internet).Is a common design, not very accurate but very usefull in many everyday aplications.
Time delay circuit (555) - schematic




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