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 16:49:56 GMT
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Original-From:
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Tom Boles <TBOLES@INTELLISENS.stopspammersCOM>
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Viewed:
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2726 times
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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.
(Can anyone look at their power supply and tell us what it says...?)
Kekoa Proudfoot wrote:
> > Along the same line, does anyone have the specs on the co-ax power plug
> > itself? diameter (outside & inside) and the polarity? I dont want to fry my
> > brick through experimentation...
>
> A plug that fits, with either polarity, 9-12V, ought to work fine.
> Capacitors and a rectifier do the conversion for you. Be careful, but
> don't worry about it too much.
>
> > (determining if there is circuitry involved should have two steps-looking at
> > the connector to see if there is the usual mechanical switch and then
> > looking inside to see if anything is connected to the switch contacts.
> > Standard electronic practice would have the internal batteries disconected
> > by the switch when the external power supply is plugged in.)
>
> As far as I know, it's not this simple. There is no mechanical switch. I
> believe the change from A/C to battery is done with diodes. As a side
> note, it's also fairly tricky to follow traces on the circuit board, since
> the board is multi-layered.
>
> -Kekoa
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Message has 2 Replies:
 | | Re: Solar-powered RCX?
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| Tom Boles wrote in message <36486EB4.3941EC00@i...ns.com>... (...) Many embedded systems use a bridge to be polarity and AC/DC insensitive on the power inputs. At the very least, you should put a series diode to protect against reverse voltage. By (...) (26 years ago, 10-Nov-98, to lugnet.robotics)
| | | 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 (26 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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| (...) A plug that fits, with either polarity, 9-12V, ought to work fine. Capacitors and a rectifier do the conversion for you. Be careful, but don't worry about it too much. (...) As far as I know, it's not this simple. There is no mechanical (...) (26 years ago, 10-Nov-98, to lugnet.robotics)
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