Name: Geekcreit® 375pcs 3MM 5MM LED Light-emitting Diode Beads Resistance Lights Kits Bulb Lamp
Brand: Geekcreit
SKU: bg-1027601
Price: 2000 INR
Availability: InStock
Rating: 5.0 (2920 reviews)

Question 1

how do you get these to light up?

Accepted Answer

Calculating an LED resistor valueAn LED must have a resistor connected in series to limit the current through the LED, otherwise it will burn out almost instantly.The resistor value, R is given by:R = (VS - VL) ÷ I R = resistor value in ohms (ohm).VS = supply voltage.VL = LED voltage (2V, or 4V for blue and white LEDs).I = LED current in amps (A)LED resistor circuitThe LED current must be less than the maximum permitted for your LED. For standard 5mm diameter LEDs the maximum current is usually 20mA, so 10mA or 15mA are suitable values for many circuits. The current must be in amps (A) for the calculation, to convert from mA to A divide the current in mA by 1000.If the calculated value is not available choose the nearest standard resistor value which is greater, so that the current will be a little less than you chose. In fact you may wish to choose a greater resistor value to reduce the current (to increase battery life for example) but this will make the LED less bright.For exampleIf the supply voltage VS = 9V, and you have a red LED (VL = 2V), requiring a current I = 20mA = 0.020A,R = (9V - 2V) ÷ 0.02A = 350ohm, so choose 390ohm (the nearest standard value which is greater).LED voltageThe LED voltage VL is determined by the colour of the LED. Red LEDs have the lowest voltage, yellow and green are a little higher. Blue and white LEDs have the highest voltages.For most purposes the exact value is not critical and you can use 2V for red, yellow and gr

Question 2

could they possibly operate on 5v?

Accepted Answer

Yesbut use of a resistor is absolutely mandatory. Otherwise it will light up for a short period of time, then burn and require replacement.

Question 3

I saw now it work on 3 volt/What can I do to connect it in my car , 12 volt?

Accepted Answer

you can join 4 of them in serial with a 100ohms resistor for current limiter... but that's not the safest. ideally you would need a current limiting circuit for LEDs to feel great with your 12v which can be up
                                                                                                                    to 16v and even higher voltage spikes. You can go with LM317 as current limiter.
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Question 4

they are ultra bright?

Accepted Answer

Bad

Question 5

Koľko 5MM je ich v jednej farbe?

Accepted Answer

3mm and 5mm available

Question 6

why not make abox with more colours ..only 5 ..if you sell more than 1000 i would love to have a box for free for giving you the idea of a good selling item

Accepted Answer

Packing and dispatching. Everything is as stated in the statement. No LEDs that haven't worked yet

Question 7

bu nasıl kargo? paket nerede,hangi firmada.ben nasıl bulacağım?

Accepted Answer

Of course.

Question 8

How to earn money in Myanmar? (kbz)

Accepted Answer

Idk

Question 9

эти светодиоды записываются от 5 вольт или от 3 вольт

Accepted Answer

kargo gelmiş görünüyor,ancak ne arayan ,nede kargo var.nereye ve kime soracağım?

Question 10

i need this product

Accepted Answer

Add it to cart and buy it then wait a little while and you will have it.

Geekcreit® 375pcs 3MM 5MM LED Light-emitting Diode Beads Resistance Lights Kits Bulb Lamp

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