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Cheap 40KHz clock

2017-01-06 09:53  
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Use a 40KHz Xtal and a 74C14 schmitt trigger: ________ <---------------- 2.2 M resistor ___| 2M2 |___ | |________| | | | | | | |\ | | | \ | +-----| O------+--------> Output 40KHz | | / | |/ gate 1 of 74C14 | | --+-- XXX 40KHz Xtal --+-- | | ----- --- - This circuit has worked for me in many applications. (it might be an idea to buffer the signal befor using it. (There are still 5 unused gates in the 'C14.. :-)