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I want to learn about analogue circuit design and thought I'd start of reeeaaally simple, with a circuit where you connect the battery and the LED turns on. I've been looking on digikey.nz for the right components but they don't seem to offer the kind of LED I'm looking for.

I want a small LED that's simple to work with, something that looks like this: enter image description here

Does anybody know what the name of this kind of LED is, and where I can get one? I've been trying to find a place to order one online but can only find lines of christmas lights, LED bulbs, or weird complicated circular things.

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    \$\begingroup\$ Google up "5mm red LED" and see things like this: sparkfun.com/products/9590 \$\endgroup\$ – jonk Nov 18 '16 at 4:11
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    \$\begingroup\$ If you are really planning to buy from Digikey then 1) search "5mm LED" 2) Select "LED indication - discrete" 3) Select "Oval with Domed Top 5mm" from "Lens Style/Size" filter then apply. You will find a lot of 5mm LEDs. Pick one according to color, price etc. \$\endgroup\$ – Rohat Kılıç Nov 18 '16 at 4:17
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    \$\begingroup\$ Digikey shipping is a bit expensive in australia and NZ. Wouldn't element14 be better? \$\endgroup\$ – Bradman175 Nov 18 '16 at 9:59
  • \$\begingroup\$ Your really simple circuit requires a current limit resistor (not as simple as you thought huh LOL). \$\endgroup\$ – Andy aka Nov 18 '16 at 10:20
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Learn how to search Distributor's using any search engine

  • Use a description of desired specs in any search engine or use their website with key words , use shopping tab in Google or include Digikey as a key word
  • or use their website and "drill down" the Product Index

    - = Product Index > Optoelectronics > LED Indication - Discrete

enter image description here

results < here

  • Click V descending sort on brightest LED [mcd] or Millicandella Rating

My pick for you MT5470E-UR Marktech ( Private label Distributor)

  • Oval Red diffused tinted lens 2300mcd 40x110 deg radial
    • $0.29 usd (100pcs)

These are rated at 2.1V @20mA and have an equivalent zener resistance of 7 Ohms.

{#1 Choice} Red in clear lens $0.11usd (100pc)

http://www.digikey.com/product-detail/en/cree-inc/C4SMF-RJF-CT0W0BB1/C4SMF-RJF-CT0W0BB1-ND/2809664

n.b. If you want deep Red (660 nmD) not as bright but lower Vf, 1.3V GaAs in Diffused tinted Red > Search

enter image description here However the easiest to use are 12V strip LEDs with built in resistors THAT OPERATE BRIGHTEST AT 14.2v FOR CARS

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ Excellent answer, well structured and formatted text, good illustrating images. \$\endgroup\$ – Uwe Nov 18 '16 at 8:09

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