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It doesn't look very clever, that chip is a TTL/cmos device and is being exposed directly to RS232 voltages. I went to the site and there is a more comprehensive version of that circuit which uses transistors to buffer/protect the chip from these voltages, you might want to consider using that - or get a max232 and a couple of caps and use that.


No. There is regulator to regulate RTS down to +5V as a power supply. DCD is an input to the PC. So it's all legit. Although it's not really to the standard PCs almost always will understand +5v/0V instead of proper TTL.

Personally I built a UIR for my MythTV but that requires a PIC programmer. After quite a few years it went a bit flaky though and I ended up buying a Microsoft MCE remote and USB receiver which works just fine under Linux.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)