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Subscribe for more videos (every Wednesday and surprise specials): http://goo.gl/QjZqko Since I installed my solar panels and inverter I noticed that the lapel microphone I was using had an annoying noise. I had to do something to fix it. Materials: Electret mic. Resistors: 1k, 10k and 100k BC548 transistor or similar 2032 battery holder 0.47uF capacitor braided cable stereo miniplug Did you like it? Thumbs up Did you not like it? Comment so we can improve Do you want to see more? Subscribe, it's free :) Do you think it can be useful to someone else? Share the video Greetings