This is my designer electronics gadget project using used mobiles and laptops. The gadget like MP3 player, Amplifier, Sound Boxes, Audio Pin Junction, Pen Drive, Pen Torch, designed using laptop keys and aluminum sheets. The car mp3 player is converted into portable mp3 player with charging option and it is powered by mobile battery. It has play/pause, prev/next and channel buttons. Laptop display is used as mp3’s screen guard and It has provision for USB, audio output pin, battery charging socket, and a switch is connected for switch-on mp3 player and charging battery.
Power amplifier is a simple circuit using LM386, it also powered using mobile battery and has option for charging. And speakers from mobile and laptop used in sound boxes. The speaker pins are cut into half the size so that its size matches the gadget’s size.
1. Car MP3 Player
2. Used Laptop and Mobile
3. Mobile Batteries
4. Electronic Components
5. Aluminium and Plastic Sheets
Step 2: MP3 power supply and wiring
I have used mobile batteries for both project, for MP3 player 3.7V/ 600mAh / Li-Ion (BL-5B) battery I used. And MP3 is Car Kit MP3 player, I have detached MP3 player board from its power adapter unit and directly applied power supply 3.7v to the board.
I designed and kept its case size according to the MP3 player board size, and height according to keyboard key. Except removing power adapter, Head phone jack and USB port form MP3 as it as the board is placed inside the case. Wiring simple, after removing thin plate above the each switch on the board wire is fixed by soldering.
Step 3: Amplifier
The amplifier set has simple amplifying circuit; the circuit is powered by a IC LM386.
Step 7: Pen torch
This is my pen torch. Works with two small LED and three button cells, the PCB case is designed to load three cells, two LED, Switch and Refill. The LED is chopped to fit into the pen.