piclist 2002\10\02\121140a >
Thread: slow sine wave freq counter
www.piclist.com/techref/method/math.htm?key=sine
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face BY : Wagner Lipnharski email (remove spam text)



Wagner Lipnharski wrote:
> From 2 to 10mVpp is not difficult to use any comparator, even the old
> LM339, but this sensor output being magnetic pickup can be tricky, any
> slower rotation of the magnet can drop down the pickup coil output so
> much that the comparator can start to miss pulses. Anyhow, at this
> voltage level you should take all possible extra care for noise,
> using shielded cable or at least twisted pair....

[snip]

wow, I just sent it once... hmmm, what happened? I received 3 of them.

Wagner.

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