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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Tue, 3 Sep 2002 23:04:56 GMT
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Viewed:
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1246 times
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"Da Byte" <dabyte@hotmail.com> wrote:
> 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
This appears to be a PNP transistor according to this datasheet:
http://www.semiconductors.philips.com/pip/bc557
The 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 won't be a
good substitute for the MPS2222A.
BTW, I went to the Conrad (International) website and I couldn't
find any semiconductors listed, so you might need to find another
supplier.
> Although it isn't quite clear to me how to obtain this saturation. What do
> I do with the circuit?
The resistor in the circuit determines the amount of current
going to the transistor's base. The 330 ohm resistor
provides more than ample current to achieve "saturation",
so you don't need to do anything besides build the
circuit and connect it to the RCX.
Mark
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Message has 1 Reply:
 | | Re: Use RCX motor output to switch devices
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| (...) Can't I secure my circuit against this 'switch', or even use it to achieve the same with output in both directions: by using diodes for example? I have tried to model something like that in software called "Crococlips" (screenshot: (URL) >To (...) (22 years ago, 4-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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| 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 (...) (22 years ago, 31-Aug-02, to lugnet.robotics)
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