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A common question is how many volts does a white LED (green, blue, etc.) have? With this circuit you can easily find out the voltage of an LED. A really cool circuit. I hope you like it and thanks! Don't have a multimeter? Banggood has a really good and VERY cheap one: MT108T: https://www.banggood.com/custlink/G3K... MT109: https://www.banggood.com/custlink/Dvm... Subscribing to the channel costs you nothing and helps promote the channel. Help keep the channel going by subscribing and giving it a like. Thanks! Subscribe: https://www.youtube.com/c/eletronicae... Thank you to everyone who contributes to this Electronics and Technology Channel community. More videos at: / eletronicaetecnologia Send a photo of your assembly for us to publish, e-mail: [email protected] Want to promote your product, send an e-mail to [email protected] To send products for review or support the channel: [email protected] Legal notice All information obtained on this website and social media pages related to it are for INFORMATIONAL purposes only. Canal Eletrônica e Tecnologia is NOT responsible for any damage or loss caused by the execution of actions related or not to the content described here. Always look for a qualified professional, follow the rules and use protective equipment for any work involving electricity. #cet #maker