Watch Tick Timer Circuit

Posted on Oct 3, 2012

This circuit adapts a frequency counter to measure intervals. It was originally used as a shutter speed checker for a photo application. The watch ticks are clipped and shaped and formed into a square wave. This square wave is used to gate an accurately known clock (1-MHz TTL XTAL OSC) and an external counter is used to directly count the clock pulses during the interval to be measured.

Watch Tick Timer Circuit
Click here to download the full size of the above Circuit.

A 1-MHz clock can be used to measure to a resolution of 1 Accuracy = time base 1 1 count LSB.

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