Subject:
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Re: Use RCX motor output to switch devices
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 31 Aug 2002 00:23:29 GMT
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Viewed:
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831 times
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In an e-mail Eric send me the following info, for which many thanks.
-----Oorspronkelijk bericht-----
Van: Da Byte [mailto:dabyte@hotmail.com]
Verzonden: vrijdag 30 augustus 2002 16:23
Aan: lugnet.robotics@lugnet.com
Onderwerp: Re: Use RCX motor output to switch devices
Thanks for the help, Mark!
I have a few questions still (I'm a novice at electronics).
In lugnet.robotics, Mark Riley writes:
> > ...
> > The transistor is easy to find (Radio Shack in the U.S. carries it).
> I live in The Netherlands, so instead of Radio Shack I buy at Conrad. Is
> there a universal transistor description in this case?
BC557
> > ...
> > it's important to keep the transistor in saturation to avoid it overheating.
> What does "in saturation" mean exactly?
verzadiging; hierdoor staat hij volledig open en heeft een mimimale
spanningsval. Hierdoor wordt er weinig hitte verstookt
[saturation means that it is completely open, and has a minimal powerdrop
(loss of power). Causing it to produce less heat]
Although it isn't quite clear to me how to obtain this saturation. What do I
do with the circuit?
> > ...
> > Also, don't try to hook up more than one switched device to the RCX in this >>fashion.
> The transitor will blow up (overheat), because of the large current (I)
> through it?
Yep; of de RCX uitgang...
[Yes. Or the RCX output...]
> > ...
> > To be safe try the circuit first by connecting it to a 9v
> > battery box (try both polarities).
> I was planning on doing that. I have a 9.6V, 300mA powersupply, I suppose
> that works just as well for testing purposes.
NEEE Deze dingen zijn vaak niet gestabiliseerd waardoor je vanalles behalve
9 v hebt!!
ALEEN indien er sprake is van een echte gestabiliseerde voeding kun je dat doen!
[NO! Those supplies aren't stabalized, so they'll provide you with any
voltage except pure 9 Volts!!
ONLY stabalized power can be used to that effect!]
Thanks again!
._ graag gedaan!
[._ you're welcome!]
Thanks again, Eric!
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Message has 1 Reply:
 | | Re: Use RCX motor output to switch devices
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| (...) This appears to be a PNP transistor according to this datasheet: (URL) transistor in the circuit diagram I provided is NPN. Also, the maximum current the BC557 can handle is only 100ma (I think you needed 250ma or so). In other words, this (...) (22 years ago, 3-Sep-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Use RCX motor output to switch devices
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| Thanks for the help, Mark! I have a few questions still (I'm a novice at electronics). (...) I live in The Netherlands, so instead of Radio Shack I buy at Conrad. Is there a universal transistor description in this case? (...) What does "in (...) (22 years ago, 30-Aug-02, to lugnet.robotics)
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