RE: [CAD_CAM_EDM_DRO] Sinosidal Encoder signals to TTL signals converter

Jon:

You're workin' too hard. :)

Last I looked, Ohm's law still says Volts = Amps TIMES resistance.

The numbers you got look right, though. Just replace those "/"'s with
"*"'s.


Andy Wander
Verrex Corporation

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Jon Elson
Sent: Friday, December 30, 2005 12:07 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Sinosidal Encoder signals to TTL signals
converter

juan gelt wrote:

>i'm glad it helped you. good thing you are already familiar with the
>linear encoders.
>you said: 'you'd get a voltage swing from zero to 11 uA.'
>

No, I just looked, I said you'd get a voltage swing from zero to 11
milli-VOLTS.

>things like this which may seem self evident to you, already knowing
>the technical data, WILL be obscure to ppl who aren't and confusing to
>ppl who measure voltages with Volts and current with Amps.
>after your 'explanation' there is still insufficient information (for
>me). this is my own deficiency, certainly.
>volts pp at 11uA would be really nice to know.
>

This conversion is made with Ohm's law, in the form :
Volts = Amps/resistance

So, if you divide 11 uAmps by 1000 Ohms, you get
.000011 Amp /1000 Ohm= .011 Volt, or 11 mV.
If you desire a different voltage, you use a different resistor value.

>knowing is it full quadrature would be rather necessary if one intends
>to decode step/dir signals.
>a resistor and a comparator isn't the whole job, if i understood what
>little i did correctly.
>

Actually, it takes two identical copies of the same circuit, to convert
the two quadrature sine waves to two quadrature square waves. You feed
one of the sine signals to each comparator, and you get two digital
(square wave) signals out.

>
>

Jon


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