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RE: Nigel's IR transmitter - some questions from a begin ner about to
bu ild one.
- To: "'ukha_d@xxxxxxx'" <ukha_d@xxxxxxx>
- Subject: RE: Nigel's IR transmitter - some questions from a
begin ner about to bu ild one.
- From: Robert Chasmer <robert.chasmer@xxxxxxx>
- Date: Mon, 13 Nov 2000 18:01:23 -0000
- Delivered-to: rich@xxxxxxx
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
Ian Wrote:
> The visible LED flashes as it should but no IR signal out. In a fit of
> complete madness I then tried a total of 5 out of 6 IR LEDs and none
of
> them worked. About this time I wondered if I had the LED connected the
> correct way round. My guess (and Nigels, the circuit creator) at the
> moment is that I have toasted all but one IR LED. Time to do some safe
> testing to find the good one and ascertain its polarity. I did some
> research this morning and it seems it is opposite to the visual LED so
> woops, Lesson 2: insert components the correct way round and check,
> check and treble check!
When I built the ciruit I used just visible LED's, after testing I swapped
in the IR LED.
Most LED's, and the IR LED's I had, have one leg shorter than the other.
The shorter leg should go towards the (-) negative, the longer leg towards
the (+) positive. Some round LED's also have a flatter bit on one edge
which also point towards the negaative. Once the circuit works ok with the
visable LED's it should just be a case of swapping it with an IR one. I
also had to make sure the IR LED actually pointed towards my TV, or HIFI to
get them to recieve the IR commands. [Disclaimer: All of this could be
complete Tosh!]
Surely if your using an inline resistor you unlikely to have fried the
LED's. I thought diodes were meant to prevent current flowing in the wrong
direction, there not fuses?
I've only managed to fry a 555 timer so far. Ahh the smell of burning
electronic components!
Rob
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