Introduction . Efficient super mini digital amplifier to obtain input 5. V 6. W of power special internal output processing circuit for maximum power output at a lower voltage super power built-in standby electronic switch built-in high -gain buffer amplifier built-in short circuit protection. 3. 6 to 6. V single-cell lithium battery or . USB -powered appropriate also be four 1. 5. V batteries power transformers to add fixed 5. V regulator circuit chip will burn more than 6. V . . Take the . USB 5. V power supply is recommended to use a single lithium or electricity . . Slim board can be very easy to put into a small plastic box or other device in the slot such as to create . MP3 / 4 or small laptop external speakers etc. as you imagine . . Special . Note : 1. . It can not reverse the positive and negative power supply voltage must not exceed 6. V these two violations could result in . IC damage. 2. . Chip have high- gain buffer the board can not alter any component parameters do not meet the parameters will result in . IC damage. 3. . Input line please try to use a shielded cable you can play the role of interference eliminating clutter current sound. 4 . Output cmos tube . BTL drive so the speakers can not be connected with the negative that is connected to the speaker four lines are completely independent does not allow total access .