Now it has been addedmicro USB female power supply interface（Not a plug but a socket）, It is not shown on the main picture. A power amplifier refers to all objects on the picture except the battery（The micro usb input line has not been photographed yet）. If you need to choose one of four AV selector circuit boards, please take a picture

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https://item.taobao.com/item.htm?id=19113049921

 
             Product name:Two-channel digital power amplifier, model FDP-2

      using electric:4~6VDC 0.5~1.5A,

           Standard configuration: 1. A 4 5 battery box;

                     2. Micro USB female socket（Is a socket, not a plug）The power supply interface can be powered by mobile phone chargers and mobile treasures, as well as by the USB power supply of a laptop or desktop computer, or even with the mobile phone''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s built-in mobile treasure function.

       Output Power：2*2W（2 channels, 2W per channel）

             enter:AUX（Dual tone 3.5mm headphone plug）

             Output:Twisted dual-channel.

Output matching impedance:8 ohm speaker box. When it is lower than 6 ohms, the low frequency output is attenuated.
            effectiveness:85%

   No headphone output: Those with hands-on ability can take the ground from the power supply, and take the power on the same side of the two output channels to form 3
Just solder the headphone jack.

      Goods status: When entering the customs, the outer box packaging and single-page manual of the machine have been cut off, the items have fallen on the ground, there may be ground dust on the outside, and the bubble bag of some battery boxes has been smashed and the appearance is marked However, all consoles and wired remote controllers are protected by bubble bags and are still brand new and intact. Only about 5% may have slight scratches. The bundled state of the signal cable can prove that it has not been used before.

     Matched with Minebea’s original multimedia built-in neodymium-iron-boron speakers, the sound quality is fidelity, zero character, no rendering, whose voice is whose voice! It belongs to the style of BOSE. After listening to it, you can feel the contribution of the fidelity and the sound source. What is rare is that it is very light and small, fully compatible with the meaning of portability. The main unit size is 62*47*14.5mm. The weight of the main unit plus all the cables, battery box and remote control is 91g plus the total weight of the mini speaker 155g. The effect can be achieved: a considerable number of middle-aged people like to listen to music again, because the low distortion and sudden dynamic performance will remind people of the feeling of "presence".

Introduction of this machine:
      This machine is suitable for all computers, mobile phones or mp3 speakers, with high fidelity! It is also suitable for outdoor places that need to save electricity and loudly, morning exercises, etc.
Work digitally, save power! More than 5 times longer battery working time than previous power amplifiers

Foxconn（China branch）For the Japanese FPS company:http://www.usfps.com/OEM products, including electrolytic capacitors are all well-known brand devices. This machine contains preamplifier and wired remote control, electronic volume adjustment, and no longer worry about the explosion noise when the potentiometer is worn and adjusted. This power amplifier is a finished power amplifier on the market that is suitable for using notebook USB power supply to obtain loud noise without harming the original notebook power supply. Why do you say that? Everyone knows that the current limit available for notebook USB is generally 0.5A, under the same volume output. The current consumption of an ordinary power amplifier is more than 4 times that of this power amplifier, and the output frequency exceeds 0.5A, which brings high temperature to the power supply system of the notebook or accelerates the aging of the device, which affects the stability of the system. The total daily current consumption of this machine in a room of 10 square meters is 60mA（Not 600）! Loud enough, about 30mA when there is no signal.

Use the third-generation digital power amplifier chip: Texas TPA2000D2, equipped with a 0.6-meter wired remote control, to achieve power on and off, volume adjustment and power switch instructions, the lead is a soft flexible wire, 4 AAA or AA battery box（Batteries not included when shipped）Equipped with highly flexible sockets, the lead wire harness is full. The dynamic range is significantly larger than that of analog power amplifiers, which is one of the important advantages of digital power amplifiers!

 Instructions:
1. Connect 3 plugs（2 speaker cables, 1 remote control cable）Insert the corresponding jack. The plug of the remote control cable is wider. It is necessary to insert it firmly, that is, the end of the plug is flush with the end of the speaker cable. This is more important. If it is not in place, the remote control cannot be controlled even though the indicator light is on. This part has already inserted the plug. If you try to unplug it, please use pliers and other tools to pull the plug instead of pulling the wire. The core wire is thin and easy to break.

2. Press the power switch once, the power indicator light is on,

But it does not mean that it can work normally, because the light can also be on when the battery is insufficient or the remote control cable is not inserted in place. This should be paid attention to.

3. Keep pressing the volume up button without letting go,

The volume will increase, and vice versa.
four,

The power amplifier’s power supply reflects: when the input voltage is greater than 1.6VDC, the indicator light can be controlled, but the power chip must be greater than 4VDC to work. Normally, the output can still be output when the voltage drops to 3.3VDC, that is to say, it will not Waste battery. It must be greater than 4VDC when it is turned on again.

Please note:

The internal output is BTL output, so the two output speaker wires cannot be touched in parallel, otherwise the short circuit is damaged, and it cannot be used as a 3-wire output headphone amplifier. When using an AC power supply, it must have a voltage stabilization function and must not exceed 6 Volts or the power supply is reversed.

Another option:

     Japanese AV four-choice switcher（Without wire）It canYour MP3, computer, notebook, digital set-top box and other signal sources are input to this amplifier without switching noise!