LEDs are just diodes - Saab 9000 Bulletin Board - Saabnet.com
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LEDs are just diodes
Posted by ls (more from ls) on Sun, 27 May 2001 10:28:40
In Reply to: Alarm LED. Before I asked a stupid question I checked the search, Shahn, Sat, 26 May 2001 23:25:54
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I think that "ratings" don't really matter much. Most LEDs have similar I-V characteristics. Being a diode, an LED will have a certain forward breakdown voltage in the neighborhood of one volt. It will most likely be driven from the car's 12 volt bus through a series resistor, and switched by a transistor. The diode's forward breakdown voltage and its brightness at the circuit design current is probably not that critical.
Physical size and shape is more important. (To fit whatever enclosure or hole it has to fit into.) So bring the old one along to find a good match. Also, polarity when you install it. One lead is larger than the other, the negative one I *think*. A web search should turn up lots of basic information on LEDs.
Posts in this Thread:
- Alarm LED. Before I asked a stupid question I checked the search, Shahn, Sat, 26 May 2001 23:25:54
- Re: Alarm LED. Before I asked a stupid question I checked the search, Jonathan Hengst, Tue, 29 May 2001 08:46:33
- LEDs are just diodes, ls, Sun, 27 May 2001 10:28:40 <-- Viewing This Message
- Re: Alarm LED. Before I asked a stupid question I checked the search, TS, Sun, 27 May 2001 05:20:00
- What exactly makes you think the LED is bad? (n/m), Lu, Sun, 27 May 2001 01:17:29
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