Need help with an LED project

I've almost collected all of the necessary parts to start experimenting. Just enough for simple experimentation.

Though I'm curious what type of wire I'll need to find to connect everything. I'm using a breadboard.

Also, I have a multimeter, is there a way I can test the voltage of the LEDs to make sure I pick the right transistor?

 Completely agree with Jayefuu.  26 gauge insulated wire is good, though you can use any piece of wire you happen to have as a start.  The insulation has to be removed about 1/4 inch (5 cm) from the ends.

You don't need a transistor, but you DO need a resistor (maybe that is what you intended), anything from 100 to 1000 ohms will work.  There are Instructables on resistors.

And you need some batteries so you have 3 v -- you can use a 9v, but make sure you have at least 200 ohms resistance.

Don't forget LEDs have polarity.  The long wire on the LED is +, positive.

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seandogue7 years ago
Since you are unsure of the LED forward voltage, I would suggest a 1K or 10K trimmer pot, since it can be adjusted to provide a variety of values for different LEDS... Also,  22ga solid core wire (or you can buy jumper wire kits from mfg like 3M at mouser or digikey or similar), and for transistor, 2n3904, although I agree with cyberpageman that a transistor isn't necessary to get started with LEDs.

Jayefuu7 years ago
If you're using a breadboard never use multistranded wire. Single core is best or all the little bits of wire will break off and mess up your breadboard.

You can look up the specifications of the LEDs easily online. Or post the kind what they are and someone can look up the required voltage for you.