RCX programmable brick : 1248


Robotics / RCX / 1248	1247 \| 1249

Subject:	RE: Custom Firmware, IR Problems, and Dead RCXs (long)
Newsgroups:	lugnet.robotics.rcx
Date:	Sat, 26 May 2001 19:59:29 GMT
Viewed:	2053 times

Even more interesting.... I've also just replaced the IRED I replaced a few hours ago in my RCX :-( This time, I'm putting a limiting resistor between the IREDs in the RCX to keep the current within limits. The following is pure conjecture on my part... I think that they (LEGO) are using a MOSFET to drive the IREDs in the RCX, and depending on the RdsON of the part, it limits the current in the IREDs in high power mode (which is what I set the output too) Anyways, off to RadioShack for more IREDs.... Cheers, Ralph Hempel

Message has 1 Reply:

		Re: Custom Firmware, IR Problems, and Dead RCXs (long)
(...) Maybe this is shedding some light on why LEGO removed the Power Port in the 1.5's. To remove a known problem without dealing with it.?.?.? Dean -- Coin-Op's For Sale!: (URL) Lego Workshop: (URL) Lego Club: (URL) (23 years ago, 26-May-01, to lugnet.robotics.rcx)

Message is in Reply To:

		RE: Custom Firmware, IR Problems, and Dead RCXs (long)
(...) 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 (...) (23 years ago, 26-May-01, to lugnet.robotics.rcx)

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