This is another usb power hack. It demonstrates how to attach a couple usb ports on a DX052 mixer board for powering your ipod(s) or any USB device. I bought this mixer recently and love using it.
Step 1: Equipment
The following equipment can be bought at just about any radioshack or electronics store.Electronics:
Step 2: Take apart the DX052 and tap power supply
The DX052 comes apart very easily, unscrew the top and disconnect all cables. The cables that connect the mixing controls to the power supply are socket connections.
With a multi-meter find a connection near the power supply to pull DC voltage. The one I used was 16v. Carefully solder a wire to it to feed the voltage regulator.
Step 3: Create the 5v circuit to supply the USB connector
You may want to lay this out on a breadboard first. Make sure you connect the pins to the LM7805 in the right order.
The pull up resisters for D- are required for some ipods charge but aren't needed for most usb devices.
Step 4: Place the circuit in the DX052 mixer
There is plenty of room. I conveniently mounted the LM7804 on the ground tap.
Strip the USB connector and solder GND, 5v, D- and D+ to it
Step 5: Drill holes in the DX052 for the usb connections
With a drill bit that can cut through metal make holes for the usb screws and connections, fill them out with a rotozip or dremel.
Cut the PC USB PCI slot bracket on both ends.
Step 6: Putting the mixer back together
Attach the USB bracket and connect the USB ports.