So we should not be surprised if the 12-meter USB Extender that we can use for Flash Disk did not work when we use the LAN or Wireless Air Card Modem. How this could happen?This happens because of lack of supply of delivery resources that go into Device power. Each conductor / cable resistance, the type and the longer the cable the greater the prisoner. Therefore, when there is current flowing in the USB cable Extender, there will be a voltage loss along the cable so that the voltage falls to the load (Device) will be equal to the voltage source voltage is reduced losses in the cable.
The amount of voltage loss would be directly proportional to the strong current flowing in the Extended USB cable. Thus on each load / device will be different in different voltage losses because each device has a different current consumption. A Flash Disk has a much smaller current consumption than the Air Card Modem or Wi-fi. So did most of the Wi-fi has a smaller current consumption of the modem.That's why the 12-meter USB Extender can be used for error or Flash Disk often can not even be used for Air Card Modem or Wi-fi that has a greater current consumption. Even in extreme conditions the device is not detected at all.
To overcome this is to build Power Injector USB modem or Wi-fi is a way to raise the voltage fall / get the device to match the value that should be the 5 Volt DC. In standard conditions, the voltage is 5 VDC from the USB connector on the CPU with the black cable to Ground (Zero) and the color Red for Positive (+) its 5Volt. To raise external power supply is used as commonly applied to the Access Point or often called USB Power Injector. You need to prepare are:• 1 piece Box / Small Box kira2 size 10 x 15 x 5 cm as Injector Power USB box. Can be of plastic or of the plate. Used as a mounting box with its Wi-Fi LAN can also be provided that enough• AN7805 IC or AN7805F and cooling plate. Remember ..!! do not use AN78L05.• Cable to taste• Solder and Lead Solder
Do the following:Prepare the USB Extender that has been extended (eg 12 meters), making USB Extender can be Read Here. Then dismantle the connection between the UTP cable with its connector and USB connector on both ends (of the CPU or the Device).Once unloaded, for the first part we are working on a device that is connected to the stabilizer. Extended Cut the USB cable connection to the combined red-orange cable orangeputih of UTP ... and rangkailah USB Power Injector like the following scheme:
Do not forget to install the cooler on its AN7805 IC ComponentsAfter that we're working on that part of the USB on the CPU resources. Extended Cut the USB cable connection to the combined red-orange wires of UTP and rangkailah orangeputih USB Power Injector like the picture above. Take a piece of wire and connect it to the yellow wire (+12 V) on the PS CPU.Red wire coming from the left USB CPU and is not used, cap / Isolate to be safe from a short circuit.Before you use a USB power injector, it would not hurt if you Test-tengangan first voltage at the measurement point as shown schemes with Volt-meter (AVO). Keep tension on the leg AN7805 IC no.1 is +12 V and +5.0 V is the No. 3 feet (Stable) in practice is usually close to 5.0 VDC, approximately 4.8 s / d 4.9 V.
Do not forget to close the connections back to isolation!Furthermore you try to load plug its USB Power Injector. Try to use the Flash Disk and do access, including transfer and copy data to and from Flashdiks. OK then if you put the Air Card Modem Device or Wi-Fi LAN. Make a connection and browsing. Perform repeated measurements of work stress on the leg AN7805 IC no.1 should range from 11 VDC.Built in USB Power Injector, sometimes hard to get good quality IC AN7805 IC so easy to heat and easily broken. For that you can use another type KA78T05xx with nominal currents up to 3 Amp. or fixed AN7805 with a transistor amplifier circuit currents TIP41C as follows:
The size of the voltage drop can also result from the type (brand) UTP cable is used to build USB Power Injector.
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