Photoresistors are very common electronic components that works like a normal resistor in total darkness, but as soon as light is hitting it, it changes. Increase the amount of light and the change will increase as well. This phenomenon is commonly used to detect when a light beam is broken, turning them into a light controlled switch. But did you know that they can also be used to make music? In this video Make: magazine walks us through a simple build that results in an electronic slide-whistle! Basically you transform light into music, and if you don’t think that is a cool idea, then what is?!
This is truly an revolutionary video! Did you know that objects can be levitated and moved around in mid air, using only sound? In this incredible video from Yoichi Ochiai (YouTube Channel 落合陽一) we see the first successful attempts to acoustically levitate small objects like styrofoam balls, water droplets, matches and even metallic nuts! Perhaps one day we can even levitate big objects like skateboards or cars? What would you like to levitate with this technology?
Electronic schematics can be a bit intimidating for a beginner, but it is not that hard. It´s like learning a new language, as long as you know the terms and symbols used, it will not seem as weird anymore. So, where do you start? Well why not start by watching this basic tutorial from RimstarOrg about the symbols associated with common electronic parts in a schematic? We promise that electronic schematics will not seems quite as intimidating afterwards.