Re: [CAD_CAM_EDM_DRO] Need Encoder Hookup Help

Bill Vance wrote:

> On Sun Nov 25 14:09:22 2001, Bob Bachman, <bobach@...> wrote:
>
> >OK you techy types, help me out.
> >
> >I have a coule of Red Lion counters which will make dandy readouts
> >for a DRO. I also have some of the famous Goldmine motors with attached
> >encoders.
> >
> >The problem: The encoders are 5 volts and the counters are 12 volts.
> >The 5 volt outputs from the encoder will not trigger the 12 volt logic
> >of the counter. I need a simple circuit that will use the 5v pulses
> >from the encoder to create 12v pulses for the counter.
> >
> >Thanks,
> >
> >Bob Bachman
> >
> >"It's our choices that show what we truly are,
> >far more than our abilities" - A. Dumbledore
>
> You could try this:
>
> O +12V
> |
> /
> \ 20K ohms
> /
> \ CMOS inverters run at 12 Volts.
> .01 | |\ |\
> 5V---||------+----------| >O---| >O-----to counter
> sig in | |/ |/
> /
> \
> / 20K ohms
> \
> /
> \
> |
> _____
> ___
> o
>
> Use open collector TTL inverters if you need speed. They need a pull up
> resistor on the output, too, but will probably work without the input side
> components shown above

Oh, no! This definitely will not work! You can't put a capacitor in
series with the encoder signal, as it needs to pass signals totally
down to DC. This would cause massive problems when the encoder
was not moving.

Jon