3.5 mm audio male connector details The microphone and ground are labelled at two places because in old type of earphones some brand used MIC/GND vice versa to the other brands Music only earphones circuit diagram This is a simple earphone circuit diagram without mic & button (Music earphones). This circuit diagram shows that how to use a 4 terminals audio connector instead of a 3 terminals audio connector This circuit diagram is used in real-time for creation of earphone at home from waste material . The video of this Project is available on YouTube Link is :- How to make earphones at home. You can Visit My youtube channel From here :- Technical Vampire
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