Re: [CAD_CAM_EDM_DRO] CNC band saw, FPM LED display

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, October 16, 2003 2:11 AM
Subject: Re: [CAD_CAM_EDM_DRO] CNC band saw, FPM LED display


> In a message dated 10/16/2003 12:18:59 AM Central Standard Time,
> dk1machine@... writes:
> Anyone know of a source for a low-cost display and appropriate
> electronics (or a schematic to build same) that will count the input
> shaft turns
> I needed to count turns on my engine-lathe which I also use for winding
> transformers, so I mounted a salvaged loudspeaker "alnico" magnet in a
delrin
> collar, and put two Hall-effect sensors on a tiny PCB-mount so that the
magnet
> passed by them both so that they provided a "quadrature" output (one was
ON when
> the OTHER one changed ON/OFF (or OFF/ON)) (that is, the two Hall-effect
IC's
> (look kinda like TO-92 transistors) could be BOTH "covered" by the magnet
at one
> time). This provided "TTL outputs" (actually, "HCmos" output swings!),
and
> is VERY reliable.
>
>
> [Non-text portions of this message have been removed]
>
>
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