Digital Tach

[Bernd Felsche]

steve ravet tapped away at the keyboard with:

> I don't know how much experience is "little", but I think that a digital
> tach will require some kind of micro controller to interface to the
> display (LCD?).  That means you'll have to do a little programming, and

It can all be done with "pure" hardware; a timer, counter and
display driver chip; for LED's, these have been around for a while.
It's as simple as displaying a count over a fixed interval; count
for a preset time, latch output to display, reset counter and start
counting again.

The component _count_ is higher than when using a uC but the
hardware is reliable (well, people excuse small hardware glitches,
but swear at software bugs), cheap and simple to understand.

-- 
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