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Tachometer interface for old OMCs
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Bill's simplification
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Bill Yacey simplified the interface box by chopping off the Schmitt trigger and feeding the signal raw into his tachometer. The tachometer he used employed the world's most commonly used tachometer driver IC, so I strongly recommend trying out his circuit first and seeing if it works with your tach. Just leave some extra room on your circuit board. If you observe glitches, add the Schmitt trigger and see if that cures it.
Also, Bill has a .1uF capacitor in addition to the electrolytic one for power supply bypassing. Mine ought to have one too.
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All projects on Shareaproject.com are user-submitted and should be used for reference information only. The projects are not intended to be complete "How-To" articles. Use the information contained in these projects at your own risk. Projects are not checked for completion, accuracy, or safety and therefore cannot be guaranteed in any way.
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