• on Miscellaneous Electronics
  • Published in issue 7/2011 on page 82
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Debouncer for 12 V Contacts

Debouncer for 12 V Contacts
Usually some effort is required if it is desired to use the positive edge of a switched 12 V signal (for example from a 12 V horn relay in a car) in a digital system. Digital systems place particular requirements on the signals they use, and the RS flip-flop often used for debouncing purposes does not provide a complete guarantee against interference. If, furthermore, there is no auxiliary 5 V supply available for the debounce circuit, we must turn to a device such as the 555 timer IC to clean up the signal.
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