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'Circuit problem [OT]'
1999\11\04@225912 by Schauf Family

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To the PIC and AVR forums:

I have been a lurker on both of these forums for a while and have been
consistently impressed by some of the information sharing on the part of
both forums and the remarkable amount of knowledge present.  Some of you --
i.e., Mr. Russell McMahon and a few others in the PICLIST -- helped me with
a hex inverter noise problem that I posted a while ago that eventually was
traced to poor circuit layout.

Well, I am asking for some of the collective wisdom of these two groups
again on a circuit problem that I have.  However, to save on valuable
bandwidth of this discussion group, I have put the problem and its
particulars on a separate webpage for those who are interested to take a
crack at.  The link is as follows:

http://web.gmtcom.com/~k3jsch/circuit.htm

Any comments, suggestions, etc., are certainly welcome.  I will keep this
page up for about 1 or 2 weeks and then take it down.  Thank you all in
advance.

Kelly Schauf

1999\11\05@002931 by Dennis Plunkett

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At 21:46 4/11/99 -0600, you wrote:
{Quote hidden}

OK,
I have had a look, now you need to explain something to me.
If the motor can exist in the high heat envoronment, then why can not the
encoder?
Does not the motor shaft have two ends? As this is to be a 1024 pulse per
rev system, you will need to use an optical encoder.
I think that more information on the mechanicals is required


DEnnis

1999\11\05@025945 by McMeikan, Andrew

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Agreed.
       most factories have access to compressed air or low pressure water.
You could put a shaft encoder in a blast furnace if you wanted.  A PIC will
get upset if it gets too hot.  I have seen encoders in a glass factory
(admittedly) not right next to molten glass :) but heavy duty encoders are
not that hard to come by, and even at $300-$400 isn't going to kill you for
a factory job.  After all you want something you can buy off the shelf easy
when someone drives a forklift into it.

If heat really is that bad then use a chain or gears and an inductive
pickup.  If you made your own out of the right materials it should even work
*inside* molten glass.  I would not recommend a PIC inside molten glass
unless you had a guaranty of a cooling fluid around it.

       cya,    Andrew...

> {Original Message removed}

1999\11\07@145540 by l.allen

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> Any comments, suggestions, etc., are certainly welcome.  I will keep this
> page up for about 1 or 2 weeks and then take it down.  Thank you all in
> advance.
>
Ignoring  the already suggested problem of "why not an encoder" the
situation is .... as I understand it... that you can derive
say 2 pulses per rev (if that is not too low a resolution) that has
to translate to 1024 per rev. This is a frequency based problem that
can be solved by measuring the frequency of these pulses.
The desired output  frequency is calculated by the PIC using this
measured frequency and youre conversion constants and output the
result to a frequency agile generator.
Using a DDS chip such as Analog Devices AD9851 or... easier..
MIcro Linear ML2036 will be an elegant solution. So a PIC and a DDS
chip, they are cheap and effective.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

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