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.

; Or to calculate values not shown in table, use the formula (supply voltage - LED voltage) / LED current. The ballast resistor is used to limit the current through the LED and to prevent that it … on Read it, and you will have your answer!Hi, I am trying to rig up a single LED for an aircraft, 24 volt system, breakout box.

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? We are learning a LOT as we work through trying to educate ourselves on this so thank you in advance for your assistance. I get a message telling me that I need a higher voltage source to light up. Reply Reply This is a late answer, but will be helpful to others. The LEDs have to be placed in 3 rows of 10 and I want to use us less resistors as possible. I suspect the voltage referred to here is AC, while LEDs require DC. 5 years ago 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. CUTEQUEEN TRADING 4PCS 50W 6Ohm LED Load Resistors for LED Turn Signal Lights or LED License Plate Lights or DRL (Fix Hyper Flash, Warning Cancellor) … Reply Reply

It's probably worth mentioning that as a lot of people will be wanting to use this for Car LED bulb applications, that 12V would be wrong for the source Volts as when the car is running it is provided with power from the alternator that is typically 13.8V. on i want use Led bulb in real electric circuit for indication at 230 volt. how much resistance is require to protect led???? How do I do this? (A diode is like a 1-way valve--it prevents electricity from flowing "backwards", essentially making AC into DC.) Step 1 - subtract LED voltage from supply voltage.

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Answer Because the resistor dissipates only 1.4W at 100 percent brightness, its heat generation is minimal enough that it can be placed directly behind a dimmer switch or right at the load/fixture.

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