Two a particular smd led i was looking at seems to be a straight forward connection 6 terminals three at either side you would simply bridge three at one end connect them to positive and the three at the other end to neutral and you would do this for each colour and do i need resistors for these as the website doesnt state.
The results were more or less the same than the first ones (I succeeded in getting more brightness due to 5050 but not enough to reach continuous 5mm). So I decided to do several tests by connecting LEDs to 5V through resistors (to aim to get nominal current through them), and then without these resistors.
A surface mount Resistor and LED An actual product these days would be more likely to use the smaller surface mount resistors and surface mount LEDs like those found on mbed modules. It results in smaller devices and mass production is easier and less expensive using modern surface mount automation equipment.
It then goes on to recommend a resistor of ateast 220 Ω resistor as do some other sources. I plan on powering the LED through the Pi Pico VBUS pin which, if I understand correctly, is roughly 5 V. Also, after some research I came to the conclusion that the blue LED is most likely in the 25 mA current draw ballpark. So with that info in mind
For the green LED, you need (5-3.2)/.02 = 90 Ω. For the blue LED, you need (5-3.1)/.02 = 95 Ω. Assuming that these resistors cause equal LED illumination, and that the light intensity varies directly as the current applied to the LED, then you need to reduce the currents to the green and blue LEDs as follows: For the green LED, the current
The stated specs are nominal, typical figures, and there will be variations. One LED may be 10mA at 1.9 VF, but another may be 8 or 12 mA or different at the same VF. That's not even taking brightness into account. Two leds with the same IV curve can be noticeably different in color and brightness too. You also have to account for your supply's
In a thin film resistor, the conductive layer is deposited in a vacuum process, known as sputtering. This creates a thin but uniform layer, only fractions of a micron thick, over a ceramic substrate. Once in place, this layer is then subjected to a photo or laser etching process. This determines the accuracy of the resistance value with a very
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do smd leds need resistors
