Simple Watch Tick Timer Circuit Diagram

This is the Simple Watch Tick Timer Circuit Diagram. 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.

 

 Simple Watch Tick Timer Circuit Diagram

 

 

 

 

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. 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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