Re: [CAD_CAM_EDM_DRO] Need Encoder Hookup Help

On Sun Nov 25 22:27:20 2001, Jon Elson, <elson@...> wrote:

>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

Silly me, here I was thinking _digital_.

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