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"Brian Davis" <brdavis@iusb.edu> wrote in message
news:I547MA.6n7@lugnet.com...
> I'd like a small powersource I can plug into a wall, and I've got a
> small 9V
> battery box that seems to have gone bad. The idea is to use a standard
> "wall
> wart" transformer to feed 9-12V DC into the small battery box. But, with
> all
> that lovely room in there, it would be nice to add a rheostat of some type
> to be
> able to dial up the voltage I really want (think very poor mans train
> transformer).
> First, has anybody done this? I'm assuming the gear motors still run
> just
> fine on "pure" wall wart output (as oppossed to RCX / control center /
> train
> drivers), but I'm more concerned with two other aspects of this: (1)
> should I
> leave in the thermal fuse (actually, I suspect this is the part that may
> have
> failed, so I may have to work without it in the circuit), and (2) if I
> just
> throw a good old variable resistor in the circuit, what sort of heat
> dissipation
> within the small batter box am I talking about? Damaging?
> Speak to me oh Modding Masters!!
>
> --
> Brian Davis
I'm not that gifted in electronics so my knowledge is limited. I'd use a 9
volt voltage regulator inside the battery box, but I'm guessing there's an
easier, more efficient, and better way...
9v regulator:
http://www.mouser.com/index.cfm?&handler=data.listcategory&D=*lm7809*&terms=lm7809&Ntt=*lm7809*&Dk=1&Ns=MfgrPartNumber%7c%7cSField&N=0&crc=true
datasheet: http://www.nteinc.com/specs/1900to1999/pdf/nte1910.pdf
-Rob
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Message has 1 Reply:
 | | RE: Small battery box into 9V powersource?
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| -----Original Message----- From: news-gateway@lugnet.com [mailto:news-gateway...ugnet.com] On Behalf Of Rob Hendrix Sent: 5. október 2004 18:40 To: lego-robotics@crynwr.com Subject: Re: Small battery box into 9V powersource? "Brian Davis" (...) (20 years ago, 5-Oct-04, to lugnet.robotics)
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Message is in Reply To:
| | Small battery box into 9V powersource?
|
| I'd like a small powersource I can plug into a wall, and I've got a small 9V battery box that seems to have gone bad. The idea is to use a standard "wall wart" transformer to feed 9-12V DC into the small battery box. But, with all that lovely room (...) (20 years ago, 5-Oct-04, to lugnet.parts.mod, lugnet.robotics)
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