ok so how come i bought a set of led fairy lights from the dollar store and there is no resistor in them, there are 10 white LED's wired in parallel with a battery box , in the box is just a switch and holder for 2 AA batteries ,no resistor anywherethey are small LED's with a flat top , last year i cut apart a string of them for a halloween project and confirmed there was no resistor,i used an AC to DC power supply to power them instead of the battery box with an output of 3.3v DC from an old sony discman, not sure the mA current outputi also plugged the power supply into a plug in electronic lamp dimmer the slide kind with a triac inside and dimmed it a little ,some of the LED's i guess burnt out after a while after about a few weeks or so and got dim, not completely burnt out ,but dimmed ,i also have a halloween wreath pre-lit with similar LED's but yellow orangish,the LED's are clear but emit an orange yellow light,in the battery box for that there is a resistor and it also runs AA batteries,3 of them but i power it with the same power supply setup ,i wire it through the battery box so i use the included resistor it is wired in parallel with the other fairy lightsso how come the dollar store fairy lights have no resistor but the wreath does?why do the fairy string from the dollar store not have resistors?i bought some white LED's from ebay (clear but emit light with a bluish hue)they say VF 3.2-3.4 IV 12000-14000 , not sure what the 2nd thing isi plan on using the same power supply setup, i have some 270ohm 1/2 watt resistorsso will i be ok if i wire say 12 LED's in parallel ,and use one of these resistorsin series between the power leads and + terminal of the power supply?the wreath i have has only one resistor in the battery box so i assume they are only using 1 resistor for the whole string of about 20 LED's, but i see that on another site it is recommended to use one resistor for each LED, but i if use one resistorcan i just multiply the value for each of the LED resistor values i get?for example when i calculate what resistor value i need using a vf of 3.2 and a power supply voltage 3.3 i get recommended to use a 5 ohm resistor ,so if want to use 12 LED's wired in parallel then can i just use one 60 ohm resistor in series between all the positive led leads wired together and the + of the power supply?instead of wiring a 5 ohm resistor in series with each individual LED? Please help meSo, I want to add 30 LEDs. 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; Or to calculate values not shown in table, use the formula (supply voltage - LED voltage) / LED current. on Be aware that mains power is rated at "230V rms", which means peaks of 325V.Supposing a 3.5V 25mA LED, you would need a 12860ohm 8.03W resistor. 6 months ago 5 years ago I need to have a LED light that will withstand higher current applications. Writer for MAKE Magazine, presenter of inventions on TV, radio, magazines and newspapers. So if I use the LED series/parallel array wizard, and I use these settings: 9V, 9.2 forward voltage (1.8 (r) +1.8 (y) + 2.8 (g) + 2.8 (b), 20 mA forward current and 4 LEDs. on sir, can i use any IC or bridge circuit type somthing to glow LED buld? Any thoughts? That is literally the exact question this Instructable answers. 6 months ago All the calculators in step 2 are just doing some simple math that you can do at home: The formula to calculate resistance in a circuit is: R=V/I or, more relevant to what we're doing: (Source Volts - LED Volts) / (Current / 1000) = Resistance * So if we have a 12v battery powering a 3.5V 25mA LED our formula becomes: (12 - 3.5) / (25 / 1000) = 340ohms. 5 years ago And the watts the resistor would have to be rated for would be at 230*0.025 i guess? This is what we know about the LEDs: Red, yellow are 1.8-2.2 v; Blue & Green are 2.8-3.2v.

Reply However if I bump up the voltage input to 12 (which to my untrained brain seems high for 4 leds...) I get a message that says my forward voltage looks suspiciously high, but I do get a schematic. That makes sense to me. plz reply How do I do this? An LED (Light Emitting Diode) emits light when an electric current passes through it.

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