Simple Basic Led Circuit Beginner Electronics Project Step 1: 3 volt basic led circuit with 10 ohms resistor. the above diagram shows a 3v led circuit, in this circuit there are two aa cells are used. when you are operating an led with 3v you have to use minimum 10 ohms resistor . for more details visit simple basic led circuit. Step 2: the led. leds come in different sizes, brightnesses, voltages, colors and beam patterns, but the selection at radioshack is pretty small and so i just picked up a couple different leds from what they had in a few different brightnesses and voltages.
Simple Led Circuit Board Step 4: final assembly. once the battery is placed on the board with the two leads in two holes. place the led on the board with its two leads in two holes as well. ideally the positive led lead should be on the same side as the positive battery lead. two small drop of glue attach the led. First, identify the longer leg of the led, known as the positive or anode leg, and the shorter leg, known as the negative or cathode leg. connect the positive leg of the led to one end of the resistor using a connecting wire, and connect the other end of the resistor to the positive terminal of the battery. next, connect the negative leg of the. Step 3: connect the led cathodes to the negative battery terminal. using a similar strategy to how you connected the positive side, solder a length of wire to the cathode of each led (shorter leads) and combine them into a single wire that gets soldered to the negative wire of the battery pack. In our simple led circuit consisting of a single led, we have used a 5mm white led and a power supply of 12v. as per the datasheet of the 5mm white led, the forward voltage of the led is 3.6v and the forward current of the led is 30ma. therefore, vs = 12v, vled = 3.6v and iled = 30ma.
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