Peter, I suspected that as well (from my earlier experience with Girder and UIR), but in this case when the remote misbehaves, so does the local/manual momentary switch. I therefore think the issue is to do with the fact that I do not have a snubber circuit across the triac. Even so, I still cant figuire out why the PIC should not respond to the inputs. That too, its not as if the PIC is hopelessly locked and *has* to be reset to recover; it would respond to an input (IR or the switch) if you try a dozen times! I did try the snubber from the URL given by Adam. The values which seemed to work were 100 ohms and 0.47 uF. But now, the monitor LED flickers at times even when the triac is off, the current being passed on by the snubber itself. Perhaps another combination of R-C might wok better? Regards, Anand ----- Original Message ----- From: "Peter L. Peres" To: Sent: Tuesday, March 30, 2004 1:14 AM Subject: [PIC] triac driving a monitor > Anand, your monitor probably has strong parasitic radiation due to decayed > filter capacitors and jams the remote receiver. Try to scope the IR rx > signal. An easy way is to put a 2mA LED in series with its pullup resistor > on the output. But this will not show glitches. > > Peter > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.601 / Virus Database: 382 - Release Date: 29-Feb-04 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.