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         Circuit diagram for Multimeter  Above diagram shows  that how we can use a dead multi meter for continuity testing and led testing  even if it is burned or its internal circuit is not working or it is fully dead we will only need three led's and some wires for connections to make a dead one into working one video of this project is available in the link below  link is :-   How to make a dead multimeter useful You can visit our YouTube channel from here :-  TECHNICAL VAMPIRE
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Long range focus torch circuit diagram & other info

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Long Range Focus Torch Circuit diagram
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Bluetooth earphone to Bluetooth receiver circuit diagram & other info

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Bluetooth earphone PCB Bluetooth earphone to Bt receiver circuit diagram Connections for female audio jack are given below 
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Surface mounted led's circuit diagram & other info

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LED  SMD ( Surface Mounted) LED polarity Circuit diagram Parallel connection circuit diagram for 15 led which are connected with USB cable 
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Earphone Circuit Diagram & other info

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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  
Location: India
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