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THE 555 AS A DELAY


The 555 can be used as a timer up to 10 minutes. This circuit is also called a DELAY.
To start timing, the START button is pressed briefly and the output of the chip goes LOW. At the expiration of 10 minutes, the output goes HIGH and the red LED illuminates.
A simple application may be for a cooking operation in a shop.
If a product needs to be cooked or heated etc, the button can be pressed and the LED illuminates when the time has expired.
When calculating the time-duration for the circuit above, the capacitor charges from 0v to 2/3 rail voltage.