Figure 1. A section of a typical LED light strip. Resistors in this case were for white LEDs. The problem with resistors is that the voltage drop will vary with the number of LEDs connected. Diodes, on the other hand, give a reasonably constant voltage drop of about 0.7 V. We can use this feature. simulate this circuit. Figure 2.
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.
SMD components can be soldered to copper tape, connected by painting the pads with conductive paint, or taped onto copper tape. This tutorial from The Exploratorium's Tinkering Studio shows two methods for attaching SMD LEDs - soldering and clear tape. Use With: Copper tape - solder or attach with conductive glue.
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How a diode produces light. (c)HowStuffWorks. Visible light-emitting diodes (VLEDs), such as the ones that light up numbers in a digital clock, are made of materials characterized by a wider gap between the conduction band and the lower orbitals. The size of the gap determines the frequency of the photon ā€“ in other words, it determines the
You mentioned running from 3.3V. With a FET, the voltage drop across the FET will be Rds * current. With 0.05 Ohm (50 milliohm) FET and 60 mA of current, that will be just .003V, so you have 3.297 to go across your LED & resistor. With a 3.2V Vf diode, that could be enough to drive it. What I have learned is this: 1) To much air flow will blow small components away (SMD resistors and capacitors) 2) To little heat and you will be heating forever without success 3) Too much heat will burn the PCB 4) Any plastic must be removed - it will burn/melt 5) large IC's need some practice and patience, because you must heat up all pins The soldering is more reliable. SMT has proven to be more reliable when performing in conditions of vibration and shake. Disadvantages. For components that will be under mechanical stress (e.g., connectors) SMT can be unreliable when used as the only method to attach components on a PCB.

The LEDs are rated at 3-3.2volts so they will work just fine connected to your 3v battery pack. The only problem, like Milton mentioned, is how long the batteries will last when running the number of LEDs that you need. Adding resistors to some of the LEDs can be used to dim them if needed.

Fig. 1: The Bourns CR series of molded, SMD thick-film resistors is rated at 1/10 W, Ā±100 ppm/Ā°C, and is available from 10 Ī© to 1 MĪ©. (Source: Bourns) Packaging and lead style are established by the product circuit board or physical configuration as well as the desired power rating. Low-wattage resistors are almost always in surface-mount
OACS.
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    • do smd leds need resistors