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Subscribe for more videos (every Wednesday and surprise specials): http://goo.gl/QjZqko This is the simplest electret microphone amplifier, with very few components and very easy to make. It will be used in many of the projects to come, such as VU meters, audio rhythm meters and spectrum analyzers. Components: 2 10k resistors 2 100k resistors 2 Cap 0.47u 2 Cap 0.1uF 1 Q1 BC548 1 U1 78L05 2 Terminals 1 Experimental pcb board in pcbwizard: https://drive.google.com/file/d/0B-Zg... full diagram: https://easyeda.com/gaston/vumetro_co... Did you like it? thumbs up didn't you 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