TACHOMETER_ADAPTER

Published:2009/6/22 22:36:00 Author:May | From:SeekIC

Use of a phototransistor and light source can enable a frequency counter to act as a tachometer:The light source is interrupted by the number of propeller blades, fan blades, spokes, or other marking. R can be anywhere from 1 to 100 kΩ. Try several values for best results.



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