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This instructable describes how to "make" a simple audio headphone amplifier. It can be used with different devices - MP3 players, Walkmans, Radios, .etc. It can be used ...
First step is to disassemble the drive. The audio amplifier board is normally placed directly behind the front panel of the drive. The PCB in most cases has ...
The second step is to investigate what you have.It is good practice to take a picture of the board by a digital camera in macro modus, to plot ...
Now starts the real research work. We have to identify which chip is used for the audio amplifier, to find the technical data (the datasheet), and to track ...
Next step is to guarantee the proper power supply of the chip. We found that the chip must be supplied by 5V source. Such kind of batteries are ...
In the datasheet was seen that the audio amp has a mute pin - your decision : You can have a switch to mute the amplifier, or to ...
Because of the existing LED - I decided to connect it as power indicator. Two connection must be done for that purpose :- the resistor limiting the current ...
Now remains to connect the inputs of the amplifier. I used a cable of defected stereo phones. Depending on the way of use of the amplifier, different cable ...
It is good to find a suitable box for the amplifier and the battery. It can be plastic or metal - in the second case an insulation must ...
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