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Dundundun

{img src="img/wiki_up/litled_LEDTester.gif" } The current is set to VBE/R1, where VBE of a 2N4403 transistor is a minimum of .75 V and a maximim of .95 V. Depending on exactly which transistor you use, a little fiddling with R1 can be set to any convenient current. (David threw one of these together with junk box parts and it delivers 17 mA, which is close enough.) Acquired from: [http://wolfstone.halloweenhost.com/Lighting/litlpo_PoweringLEDs.html] 03-26-2008.

Schematics

• [http://www.discovercircuits.com/list.htm]
• [http://www.reconnsworld.com/audio_simplepreamp.html]
• [http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm|317T variable voltage regulator AND transistor enhanced]
• [http://www.dprg.org/tutorials/2005-11a/index.html|Better PWM 555]

Calculator programs

• [http://www.csgnetwork.com/freqwavelengthcalc.html]
• [http://www.freewebs.com/skunkworks/CIRF/XLXCjs.html]
• [http://lalena.com/audio/calculator/inductor/]

Lessons/Tutorials

• [http://info.ee.surrey.ac.uk/Workshop/advice/coils/terms.html|Formulas Gallore]
• [http://www.tpub.com/content/engineering/]
• [http://www.maxim-ic.com/appnotes.cfm/appnote_number/1760]
• [http://www.kpsec.freeuk.com/]
• [http://www.faqs.org/docs/electric/]
• [http://www.kpsec.freeuk.com/555timer.htm|Tested 555 circuits]
• [http://www.uoguelph.ca/~antoon/gadgets/555/555.html]
• [http://www.lalena.com/audio/calculator/inductor/help.shtml]

Online Parts

• [http://www.elexp.com]
• [http://www.mouser.com]
• [http://www.digikey.com/]
• [http://www.advancedsemiconductor.com/cgi-bin/search?pattern=2sc2879]

Component Manufacturers

• [http://www.fairchildsemi.com]
• [http://www.national.com]
• [http://www.microchip.com]

Verified Circuits (we built and tested these to have functionality)

• [http://www.warplink.com/user/kencan/lm386.htm]
• [http://ourworld.compuserve.com/homepages/Bill_Bowden/page12.htm]
• [http://www.kpsec.freeuk.com/555timer.htm]