Subject:
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RE: Custom Firmware, IR Problems, and Dead RCXs (long)
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 26 May 2001 18:13:23 GMT
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Viewed:
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2079 times
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Dean Husby wrote:
> > 2. To conserve batteries, I use a RadioShack adapter through a
> > Y cable to the tower and RCX (Obviously, I have a 1.0 RCX)
> > The adapter is 273-1656A, which is rated for 800mA at 9V.
> > The actual output (unloaded) is about 12 volts - near the posted
> > limit for the RCX.
>
> I'm pretty sure I know your problem to your number 2...
>
> The IR Tower has no protection against higher power. Running an
> unregulated power source into the IR tower is not a good idea! Use a 9v
> regulator package (The little 3 prong packages with the metal tab and hole
> at the top) to steady it out. Works great. Even .1 of a volt out of spec
> could be enough to burn out the components.
Actually, there's a regulator on the Tower that takes the voltage for the
digital side to +5 and keeps it there. The capacitor is only rated
for 10V.
The higher voltage will allow higher current through the IREDs as they
are connected right to the supply and go through the limit resistor and
NPN transistor switch.
I will be using a regulator from now on though....
Cheers, Ralph Hempel
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