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I've read that there's a benefit to using twisted pair wire for
carrying signals when the distance isn't small.

But what do you do when you have 3 lines (Vsupply, Ground, and
Vout)? Should I braid them all together?...Or wrap the third around
the twisted pair?

Mike

On Saturday 10 April 2004 07:23 pm, upand_at_them wrote:

I've read that there's a benefit to using twisted pair wire for
carrying signals when the distance isn't small.

But what do you do when you have 3 lines (Vsupply, Ground, and
Vout)? Should I braid them all together?...Or wrap the third around
the twisted pair?

The benefit to twisted pair is that noise induced into one wire will also be
induced into the other one at pretty much the same amplitude, and the wires
will typically be balanced, and out of phase with each other. Phone lines
work like that -- no shielding, and they can run for miles with really low
level signals and not pick much up. Balanced microphone lines that run all
over in broadcast and recording studio setups also work this way.

What kind of signal are you running, and how is it interfaced at each end?
How long of a run are you talking about?

The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor. Nothing will be over 5V and my wires
will be about 3 feet long. Soldered and heat-shrink tubing at the
device end and header connector at the other end.

Mike

--- In Electronics_101@..., "Roy J. Tellason"
<rtellason@b...> wrote:

What kind of signal are you running, and how is it interfaced at

each end?

How long of a run are you talking about?

On Sunday 11 April 2004 10:29 am, upand_at_them wrote:

The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor. Nothing will be over 5V and my wires
will be about 3 feet long. Soldered and heat-shrink tubing at the
device end and header connector at the other end.

Well, in that case I would twist the wires only to the extent that you want
to for cosmetic reasons, and not worry about the effects on the signals...

Mike

--- In Electronics_101@..., "Roy J. Tellason"

<rtellason@b...> wrote:

What kind of signal are you running, and how is it interfaced at

each end?

How long of a run are you talking about?

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On Sun, 11 Apr 2004 14:29:26 -0000, upand_at_them <upand_at_them@...> wrote:

The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor. Nothing will be over 5V and my wires
will be about 3 feet long. Soldered and heat-shrink tubing at the
device end and header connector at the other end.

Mike

Are these analog signals or digital?
if digital i would do nothing, a shielded cable if analog.

Keep things low impedance and there will be no problems.

Braided wires are sometimes used with measuring systems, because
it keeps induced voltages similar and also keeps capacitance relatively low.
you can braid more than 3 wires also.

ST

I doubt twisting will make much difference as your signals will be
changing slowly and you have very short runs.

--- In Electronics_101@..., "upand_at_them"
<upand_at_them@y...> wrote:

The two devices I planned on using this for are a LM335 temp sensor
and a Motorola pressure sensor. Nothing will be over 5V and my

wires

will be about 3 feet long. Soldered and heat-shrink tubing at the
device end and header connector at the other end.

Mike

--- In Electronics_101@..., "Roy J. Tellason"
<rtellason@b...> wrote:

What kind of signal are you running, and how is it interfaced at

each end?

How long of a run are you talking about?

Oh, okay. I didn't realize 3 feet was considered short.

Thanks.

Mike

On Sunday 11 April 2004 02:53 pm, upand_at_them wrote:

Oh, okay. I didn't realize 3 feet was considered short.

You're looking at a propagation time of only a little over 3 nanoseconds,
there... :-)