Re: Question? UCN5804

Digi-Key

Range 1.0K - 2.5K

Watts = 5

805F-1k-ND $4.68

or .....

if you put 10 resistors, 10K, in parallel, you get 1 K total
resistance.

- resistance value divided by the total number of same ohm resistors.

also, if they are all 1/2 watt, that becomes a 5 watt resistor
circuit.

- single resistor wattage times total resostors.

The single Digi-Key resistor is great because it has a heatsink, an
anodized metal body and mount screw holes.

If you have the option, use a higher wattage unit than you require.
the stuff will heat up at those temperatures and so will the
enclosure putting the total heat gain very high. the higher rated
stuff can handle the power better than stuff on the maximum limit.

Also, some circuits need the max as the occasional peak, some stepper
drivers run at the peak all the time.

If you are ordering parts, get the good resistor, if you are stuck,
you can get by with using multiples, but it is not a slick or as neat
a job.


Dave




--- In CAD_CAM_EDM_DRO@yahoogroups.com, Carl Mikkelsen <cmm@a...>
wrote:

> Not to be off-topic, but you would do better to solder five 4.7K

ohm 1 W

> resistors in parallel. Five 1K ohm resistors in parallel would

yield a

> resistance of only 200 ohms.
>
> Googling "resistors in parallel" resulted in:
>

http://www.physics.uoguelph.ca/tutorials/ohm/Q.ohm.intro.parallel.html

> which explains how to calculate the result.
>
> -- Carl
>
> At 05:03 AM 7/2/2003 -0700, you wrote:
> >On Tue Jul 1 21:40:34 2003 ben_englund wrote:
> >
> > >> > > From: k00lmon <k00lmon@y...>
> > >> > >
> > >> > > I'm trying to learn how to operate a stepper motor by

making my

> > >own
> > >> > > circuit. I have read through "The Robot Builder's Bonanza"

by

> > >Gordon
> > >> > > McComb and found a circuit utilizing a UCN5804 IC to

control a

> > >> > > stepper motor. What I don't understand is that the circuit

has

> > >> > > resistor components that were indicated as 2 to 5 watts at

1K!

> > >Where
> > >> > > do I find 2 watts resistors? Is it easier for me to learn

how to

> > >> > > control a stepper motor by just buying a kit? Are there any
> > >kits out
> > >> > > there that teaches u the basics of controlling stepper

motors

> > >that
> > >> > > anyone could recommend? Thanks for reading.
> > >
> > >Radio shack used to carry 2 watt resistors but I see they are

getting

> > >away from components lately. Kind of sad... Should still be

able to

> > >buy them on the web site or through the catalog though. Or order
> > >from Digi-Key, they are real good. I get small orders the next

day

> > >and free shipping. Hope this helps.
> > >
> > >
> > >Ben Englund
> >
> >Or, you can make a 5 Watt, 1K resistor, by taking five 1 Watt, 1K

resistors,

> >and soldering them in parallel with each other.
> >
> >Bill
> >
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