No
problem :-)
You expect Craplins to....
a.
Have fuses
b.
Have the rating you want
....Good Luck :-)
Rapid Electronics sell some "Self Resetting Electronic Fuses" in
various ratings.
If
you exceed the design current they overheat and go high resistance.
Because they become high resistance it causes them to self heat
maintaining the high resistance.Because they
are now high resistance very little current flows into the protected load
(only a few mA) thereby removing any risk of damage/fire.
When you remove the short circuit or overload and unplug the faulty
circuit for a few minutes, no current flows so the device cools down and
becomes low resistance. Reconnect your load and normal operation is resumed
without having to replace anything.
Keith
Shudder. Thats all I am saying right now. Circuit
has ben working fine in place, but the concept of one of my
tech-friends plugging their laptop into the wrong CAT-5 socket, and
setting the house on fire is not an image which will go away quickly!! I
reckon my best approach is to use two inline fuses, one each for 12V and
5V. I reckon 100mA for the 5V line, and about the same
for 12V. feel *much* safer now, having thought this
through.
alhough, I have just disconnected my IR circuit till I can get into
Craplins :
Thanks Keith!
Ian(s) {Lego and Board} and all
IF you draw power from a PC power connector you MUST fit inline
fuses, especially if you are going to feed it over CAT5.
CAT5 cable has a maximum current rating of around 250-350mA.
Modern PC power supplies are capable of supplying in EXCESS of
40A @ 5V.
THIS IS ENOUGH TO START FIRES !!!!
Not only will a suitable fuse protect your PC from external
damage, it could also save your house. The PC power supply would only
shut down (or blow up) in the event of attempting to draw more current
than it was capable of supplying. Anything below that level and it will
happily supply it irrespective of the cables ability to safely carry
that level of current.
Keith
Ahhhh. This circuit is *not*
powered from the Serial Port (although the
original UIRT was) My
version of the circuit is powered by a Y-Splitter
Power Cable on
one of the Hard Drives in the server...
Extra useful because it
provides +5 for the UIRT and +12 for the IR Bus,
although extra
nervous-inducing when testing new modules. probably don't
want to
fry my PC PSU!
The circuit I supplied to you is the highest res
on the net, lifted from the
site of the guy who came up with the
mod to the original UIRT
Ian.
-----Original
Message-----
From: Ian B [mailto:Ian@xxxxxxx]
Sent: 22
February 2002 22:21
To: ukha_d@xxxxxxxSubject: RE:
[ukha_d] IR Tx/Rx
Time to hide????
Have got the bits
>from
low res, is there a better one on the net anywhere?
Notes: if
you want to power the LEDs any harder you will need a
separate
power supply and a transistor. The PIC can only source
25ma max and I don't
know what the serial port can
supply.
Do folks want this?
Ian
-----Original
Message-----
From: Quinten Uijldert
[mailto:yahoogroups@xxxxxxx]
Sent: 22 February 2002
22:03
To: ukha_d@xxxxxxxSubject: Re: [ukha_d] IR
Tx/Rx
> I wouldn't even know where to start
Quinten.
>
> Girder uses plug-in DLLs to talk to IR
transceivers, and the
> IR protocol for the Lego Tower would
require a custom DLL to do.
>
> I'm a hardware engineer (I
don't even know C) and I just don't know where
to
>
go.
>
> I can confirm that the tower doesn't work with any
sort of generic UIR
> plugin.
>
> I looked at this
extensivly before trying the UIRT. I mailed a pile of
stuff
>
to the other Ian,
> hopefully he can do something with
it.
>
> Ian.
Ok, in that case I will have no other
option than to stalk Ian "Board" Bird
instead then
;-)
Q.
--
Very funny Scotty. Now beam down my
clothes!
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