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NLS

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About NLS

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  1. First number: 5 or 7.4 or 9 (depending on the setup I'll make) Second number: - If I calculate resistor for EACH set (4 resistors total before the parallel connection) then (adding the numbers as "note 1" says) then 10.4 (3.2 x 2 + 1.9 x 2 the first 3mm red found in the list) - If I calculate a single resistor for the whole setup, even worse, 41.6. Third number: 20 (a typical current) ...boom... "Try Again! The source voltage must be a bit higher than the forward voltage." So according to this, a 5V can power a... single white LED with a bit of voltage to spare. (REALLY doubt that)
  2. Well tried to use that calc, but seems if I add the (supposed) Vf I am well over the allowed numbers (whether I use 5V source, 7.4V or 9V). Must be doing something wrong.
  3. Thanks, sounds like a plan. So, not bother with direct-to-battery (main or dedicated), not bother with resistors?
  4. Hello and I hope for warm welcome (read: with helpful replies :D). The car in question is a FEIYUE FY06 (google it). It has a 7.4V 2S battery 3000mAh. Has two empty connectors on the ESC (35A). It has space for 4 x 5mm LED on top 2+2 x 5mm LED in front 3+3 x 3mm LED in the back So I got four (4!) of these sets: http://www.ebay.com/itm/4-LED-Light-Set-Headlight-Headlamp-Taillight-for-HSP-1-10-RC-Car-Truck-Crawler/152493354026 Note white are 5mm and red are 3mm like I need... so with four sets I fill all positions and have 2 red to spare (probably put inside the cabin somewhere). AFAIK the 4 LEDs are connected in parallel and I don't plan to cut the wires to change the arrangement. I don't think any resistor is included. I don't think the seller gives any more info (current or voltage). The problem is the wiring, the proper way to connect them (in series for each set or in parallel), resistors to use, power source to use... pretty much everything. I also plan to use an on-off switch. So let me be more specific to help you help me: 1) Use which power source? The LiPo (7.4V, 3000mAh, but would like to be ready for 3S too)? The receiver? (2 empty ports, 5V most probably) A simple 9V alkaline battery? If on the LiPo (or receiver) what kind of drainage should I expect? Noticable? 2) What kind of connection do I make? As I said, I don't want to cut the wires, so I will use the 4 sets as they are (each of them is a parallel set of 2x5mm white and 2x3mm red), but then I am free to choose the best way you tell me to interconnect them. In series? In parallel? 3) Depending on #1 and #2, what capacitors I need? How many and connected where? (a single one for all this or or four individual for each set?) Can somebody provide me with "stupid proof" info please?
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