Subject:
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Re: Solar-powered RCX?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 10 Nov 1998 18:42:47 GMT
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Viewed:
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5479 times
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Kekoa Proudfoot wrote in message <199811101742.JAA03702@pixel.Stanford.EDU>...
> > Sorry, maybe there is to much engineer in me but are you saying the
> > external power supply produces low voltage AC and that it is rectified in
> > the brick to DC to run the system? I can believe it's regulated inside,
> > but it needs DC from the "wall wart", not AC.
>
> I believe AC is okay, although most wall warts are DC. Look at the little
> 9-12 V ~ symbol right near the port :)
This implies a 9-12V AC adapter. This is a cost reduction, since a DC adapter
is generally a transformer, bridge and minimal filtering.
The Brick needs reverse voltage protection anyways, so why not move the bridge
from the wallwart to the brick?!
The CPU needs a regulated supply, which can be got from the lumpy 9-12. I'll
wager that if you measure the output of the motor port at high load full on
you will see some AC ripple in the order of a volt or two?
ARRGGH. I have all the tools to do this and no Mindstorm!
Cheers,
Ralph Hempel - P.Eng
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The train stops at the train station,
The bus stops at the bus station,
So why am I sitting at a work station?
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Reply to: rhempel at bmts dot com
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Message has 1 Reply:
 | | Re: Solar-powered RCX?
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| I use a big transformer only type wall wart I had laying around. Pure AC output. The wall wart says it is 9VAC @ 3.2A but no load is about 10.5VAC. I'm sure this is more power than I need but it was free. If I look at the normally (battery) 8.2vDC (...) (28 years ago, 10-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: Solar-powered RCX?
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| (...) I believe AC is okay, although most wall warts are DC. Look at the little 9-12 V ~ symbol right near the port :) -Kekoa (28 years ago, 10-Nov-98, to lugnet.robotics)
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