<DIV>I'm having a hard time tracking down the IR LED, at least the one shown in the diagram (LD271) I know it's Osram but Newark doesn't have that line from them, and Newark (for tose in the u.s.)is probably the best electronics retailer. <BR>So can someone tell me the specs I need on the infrared emitter? I found some by Fairchild but they seem to differ in mA and angle? Not sure which one.</DIV>
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<DIV>Thanks</DIV>
<DIV>Stuart<BR><BR><B><I>Chris Osgood <mythtv@functionalfuture.com></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I'm using the same transmitter. (IR LED + diode + 220 Ohm resistor)<BR><BR>The suggested 1k resistor was too much for my modern serial port as it<BR>only does like +/-5V in the first place.<BR><BR>With no resistor I get a range of over 8 feet (as far as I could easily<BR>test).<BR><BR>With the 220 Ohm resistor I get a range of about 2-3 feet which is all I<BR>need since it's stuck on the front of my cable box.<BR><BR>Note that I've found the range can vary drastically depending on how good<BR>the receiving device is.<BR><BR>Works great so far.<BR><BR>--<BR>// Chris<BR><BR><BR>On Mon, 5 Jan 2004 steve@nexusuk.org wrote:<BR><BR>> On Mon, 5 Jan 2004, Stuart Felenstein wrote:<BR>><BR>> > Reading the lirc documentation on the simple transmitter, seems to<BR>> > suggest the serial port may not be safe.<BR>> > Any comments on this , as I know people have built
them?<BR>> > Did you go with the suggested options for eitehr a bigger resistor or<BR>> > amplifier circuit?<BR>><BR>> I assume you're talking about an IR transmitter? I built both the<BR>> homebrew transmitter and receiver as shown on the LIRC site and it works<BR>> fine. The RS232 specs provide very a very robust electrical specification<BR>> for the port and it's well buffered so I can't imagine you would blow it<BR>> by just sticking an LED across it.<BR>><BR>> --<BR>><BR>> - Steve http://www.nexusuk.org/<BR>><BR>> Servatis a periculum, servatis a maleficum - Whisper, Evanescence<BR>><BR>><BR>_______________________________________________<BR>mythtv-users mailing list<BR>mythtv-users@mythtv.org<BR>http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users<BR></BLOCKQUOTE>