Re: home brew tachometer

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Robin Copini by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rcopini-at-merlin-dot-net.au>

Hi Marc,

 Take a look at what I did at


 http://www.geocities-dot-com/rcopini/srsgsetup.html

Best Regards

 Robin Copini



Tesla list wrote:

> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
>
> Hi Marc,
>
> Absolutely! A scope can be used to check the rotational speed. All you need
> to do is trigger the
> scope on each revolution (the Al tape you thought of, prox sensor, light
> sensor, or whatever).
>
> Bart
>
> Tesla list wrote:
>
> > Original poster: "Metlicka Marc by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
> >
> > All,
> > I was just think about tach'ing a motor and wondered if a scope could be
> > used?
> > My thinking is that if i stick a small piece of aluminum tape on the
> > disk, shine a strong pinpoint type light on it, then use a photo diode
> > or photo resistor or something, couldn't the pulses from the reflective
> > tape be "counted" with a scope, counter, or even the frequency function
> > of a dmm?
> > I would think that "something" could be setup for a tach?
> > Now for the strobe, Couldn't a simple dimmer circuit like the triggered
> > gap driver, be used to fire a camera flash lamp?
> > I would try some of this myself if i didn't already have too many
> > projects going.
> > So just some thoughts, comments?
> > Marc M.