The circuit for lighting a blue LED is a very easy circuit to build.
It consists of the blue LED, a 1K ohm resistor, and a 9-V battery clip.
LEDs have one lead longer than the other. This long lead must be connected to the (+) terminal of the 9-V battery using the clip leads.One lead of the clip should have the 1K ohm resistor soldered to it and the opposite end of the resistor soldered to the LED, as shown below.
Mouser Electronics
2401 Hwy 287 North
Mansfield, TX 76063-4827
ph: 817/483-0931
fax: 800/346-6873
http://www.Mouser.com/
Blue LED
604-L53MBC Kingbright T-1 5mm Water Clear, $2.52 each
Resistor
29SJ250-1K 1 kilo-ohm, 1/4 watt, carbon film resistors, $0.07 each
9-V battery clip
123-5004 EAGLE PLASTICS PREMIUM BATTERY SNAP BLK MOLDED,2PC,I-4", $0.36each
Digi-Key Corp.
701 Brooks Ave. South
Thief River Falls, MN 56701-0677
(800) 344-4539
http://www.digikey.com/
Blue LED
P465ND Panasonic T-1 5mm Water Clear, $4.31 each
Resistor
1.0KQBK-ND 1 kilo-ohm, 1/4 watt, carbon film resistors, $0.28/5
9-V battery clip
BS6I-HD-ND 9-volt BATTERY SNAP BLK MOLDED,2PC,I-4", $0.33 each
Radio Shack
Blue LED
276-311 Blue LED (5mm lens) $3.29
Resistor
271-1118 1 kilo-ohm, 1/2 watt, carbon film resistors, $0.99/5
9-V battery clip
270-324 9-volt BATTERY SNAP, $2.59/5
The above catalog numbers and prices subject to change.
Last updated 10/19/2006
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