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👉This is a full step by step Tutorial on how to put LED-Lights inside (almost) any Hot Wheels Car. You can find more in-depth information right down below. 🔰🔰🔰 Beginner’s Advice 🔰🔰🔰 Start simple! Choose a Car with clear headlights, get yourself 2x batteries, a Switch, Cable, and 2x WHITE LEDs, WITHOUT any Resistors. (Btw it doesn’t hurt to buy 4 batteries and at least 4 switches… I speak from experience...) Don't be scared to fail, you probably will. I can tell that I did many times ;D With every fail there is a lesson to learn, you can improve yourself while solving it. Win-Win. Just start and have fun! 🟢🟢🟢[FULL] Shopping List / Item Summary + Information:🟢🟢🟢 👉 Micro Cable Type: “2x 0,014mm²” 👉 Micro SMD Switch 👉 Battery: SR44 Battery (aka V357) - Best Performance (Alternative: SR45, aka V394 - Smaller, but less capacity) Important: Whichever Battery you choose, it absolutely needs to provide minimum 1,5V, better 1,55V each (2x = 3,1V in total), so that you can power white LEDs that need a minimum of 3,0V threshold voltage. 👉 0805 SMD Resistors: If you use RED LEDs you need resistors, because they have a much lower threshold voltage of ~ 2V. If you attach it directly to 3 volts, either the Red LED is going to die, or the White LEDs won’t work. In any case, resistors will balance and prevent high currents, so that your battery can last much longer. Theory: Equation to calculate Resistor Value: ((Battery Voltage) - (Threshold Voltage)) / (LED Max Current) Example1: RED LED: 2,1V and 20mA max (3,1 – 2,1)V / 0,02 A = 50 Ohms [Tip from my side: this value didn’t work for me at all, I went up to 250 Ohms each, otherwise all my white LEDs went almost dark] Example2: WHITE LED: 3,1V and 20mA max (3,1 – 3,1)V / 0,02 A = 0 Ohms Tip from my side: in theory you could use no Resistor, but I found through some experiments and measurements that as adding as little as 24 Ohms will keep light brightness almost as high as without an resistor, while reducing current significantly 👉 longer battery life 👉 In any case, you can also just buy some resistors across 24 Ohms (White), 50, 250 (Red) up to 500 Ohms and just try out what brightness you like the most. As always, theory is one thing, but practice is a whole other experience. 👉 LEDs: If you want to avoid SMD LEDs: Buy 1,8mm LEDs (alternative 5mm), modify them like in the video. Best Option: SMD LEDs: 0805 SMD LED for tiny applications: E.g. Underglow, very small Head/Taillights, other accessories… Dimensions: 2.0 x 1.2 x 0.8 mm, Short Square From. 1206 SMD LED: I found that this is a perfect allrounder. Worked well on Head/Taillights, but can be used in any situation where it fits. Dimensions: 3.2 x 1.6 x 0.8 mm, Long Square Form. 2835 SMD LED: Newer LED type that makes 3528, 5050 und 5630 obsolete (efficiency: Smaller but brightness like the big ones) Max Current is general 0.02 Ampere = 20mA for almost all LEDs. Still be sure to check technical data sheet. 2835 SMD LED (the Big and Bright one) can hold up to 60mA, but they emit at 5-20mA more than enough light. 👉 Some stuff you may find at home: electrical tape (other tape should work just as well if you do it properly) 👉Soldering paste to improve flow ⚠️⚠️⚠️Trouble Shooting/FAQ:⚠️⚠️⚠️ #1 “My LEDs are flimmering” 👉 Check wobble contact on battery. Tighten the connections, make sure to stretch hard on electrical tape while attaching. INCREASE CONTACT AREA like shown in 05:27. If there isn’t a loose contact, check other contacts on switch, LEDs and Resistors. #2 “Red LEDs are much brighter than white LEDs” 👉 Increase Resistor on Red LEDs. Check if any other Resistors are correctly selected according to the formula, no problem if values are a bit higher. Check Data on Threshold Voltage (Red usually ~2V, White, Violett, Blue ~3V). #3 “Nothing works :(” 👉 Check all connections on any place if they are soldered correctly. Check if everything is connected like in the circuit diagram 09:44. Check Battery. #4 “Only one LED is dark/doesn’t work” 👉 Maybe you’ve successfully cooked a LED. Check Wire Connection to this LED. #5 “Battery gets hot” 👉 Immediately switch it off like it’s hot and check for loose contact on the battery, either at the outer connections or in between both battery’s. See #1 #6 General Advice: Make sure that everything is isolated. You can use heat-shrinking tube, plastic sheets, electrical/normal tape or enamel paint to seal it. #7 “When I switch my setup on, it works fine for a few minutes, then everything gets darker and darker” 👉 A) Maybe your battery is drained or you have damaged it mid installation by accidentally short-circuiting it. 👉 B) You have a high current flowing (which can damage/drain the battery quickly) because of too low Resistors-Values. - Increase them accordingly to the formula and go to #2. 👉 C) I installed 10 LEDs in total, which I find is not easy to handle for the battery. Either remove LEDs or increase some resistors to cope with less current at the cost of less brightness. Alternatively, install an external battery like shown in 11:39. #8 “Switch doesn’t work?” 👉 Make sure to wire it correctly: If there are 3 pins: Use the middle one and one from the outside. (If you choose both outer pins, it won’t work) Subscribe!❤️