Re: [CAD_CAM_EDM_DRO] Re: Question? UCN5804

On Wed, 2 Jul 2003 05:03:25 -0700 (PDT), 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.

No, you can't.

You end up with a 200 ohm resistor.

Do this with 4 5.1K ohm resistors and 1 4.7 k resistors. That will
get you as close as you can get. Each of the resistors needs to be 1
watt. The 4.7 K resistor will get fractionally warmer.

(You end up 400 plus and 300 minus, which when averaged out, is about
20 ohms plus. close enough)


Must have been really early for you. <grin>

Harvey

>
>Bill