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How to build a simple touch sensor

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Touch sensor circuit - https://www.build-electronic-circuits.com/how-to-make-a-simple-touch-sensor/ You only need 3 components. A transistor, a resistor and an LED. Connect the resistor and LED in series from the positive supply to the collector of the transistor. Connect the emitter of the transistor to the negative terminal of the supply. Now, create two wires with exposed ends – so you can see the metal. One goes to the positive supply. The other goes to the base of the transistor. This is all it takes. Now, try to touch these two wires with your finger – and the LED lights up! The reason is that your finger acts as a resistor and will give enough current to the base of the transistor to turn it on. You might need to wet your finger for better connection. Check out the video om me building it here: Keep On Soldering! Oyvind @ build-electronic-circuits.com PS! This is one of the circuits you will build in my ebook «Getting Started With Electronics». Along with other fun and simple circuits, to get you started in electronics. Get it here: https://www.build-electronic-circuits.com/products/getting-started-with-electronics-ebook/ ----------------------------------------------------------------------------------------------------------------------- Free course: https://www.build-electronic-circuits.com/free-email-course/ Check out my blog: https://www.build-electronic-circuits.com/ Facebook https://www.facebook.com/BuildElectronicCircuits Join my Ohmify community at https://ohmify.com/ and learn electronics in an easy and fun way. Hope to see you there! Facebook: https://www.facebook.com/ohmify Instagram: https://www.instagram.com/ohmify_circuits/ Thanks for watching!

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