Re: home brew tachometer

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

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.