Max. range: 9,950 meters with two digits
Slip it in pants’ pocket for walking and jogging
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants’ pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 [...]
The basic digital circuits are Flip Flop and Counter, both are here. This circuit can be cascaded to make even a 6 digit event counter, even a simple frequency counter can be made.
Read more : Simple Digital Counter by 4026
The natural choice for generating a pulse of variable frequency and duty cycle is a good bench-top pulse generator. If you don’t have a generator or must build one into your system, however, you can do it with a few op amps and some external components………………
Read more : Simple Pulse Generator Has Low Parts Count [...]
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