• on Miscellaneous Electronics
  • Published in issue 7/2009 on page 83
About the article

Economy Timer

This circuit detects when a window is open (it can also be used with a door), indicates that the window is open by means of a red LED or a blinking LED, and emits a loud acoustic signal from an intermittent electronic buzzer to remind you to close the window.
The active components consist of a pair of type 555 timer ICs.
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