You recomended clamping one on the USB cable, but for that I need to cut the USB cable and put a bead on each cable inside or just put one around the black USB cable itself?
You can get a split ferrite intended to go round a cable, they usually have a plastic housing that is held together with screws. You open it up, put the cable in and close it up again.
You can also use a toroid (ring) ferrite that is big enough for the USB plug to pass through, or pass the whole cable through before putting the USB plug on. If the ferrite is big and there is enough cable, you can put multiple turns of cable through it, which increases the effect.
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I have one other question regarding the PCB schematics on that same website. The USB type B I bought has 6 pins and the heaphone female jack has 5. According to the draw on top of the website all 6 pins of the USB should be soldered and only 3 of the headphone jack. I can understand why only 3 are connected but then when I look down to the PCB schematics I see 5 holes on the headphone place and only 2 on the USB place. Am I missing something here?
All 5 pins of the headphone socket are actually connected, there is a tie between the LHS and RHS pins on the top foil pattern.
Pins 5 and 6 of the USB connector are partly intended for securing the connector shroud to the PCB and are also connected to ground to improve the effectiveness of the shrouding.
The PCB foil layouts are flipped with respect to one another. The top one on the page shows the top of the PCB, and 2 connections going to the upper 2 USB connections. This foil pattern is a
mirror image and the USB port is at the opposite end from what is shown in the photo.
The lower pattern shows the bottom layer of the PCB. It is NOT mirror-imaged, and it shows 2 connections going to the lower 2 pins on the USB connector.
They should really have mentioned the mirror-imaging. The top foil pattern is mirror imaged because is intended for home etching, so that a laser print on transparency (or paper for toner-transfer) has the ink against the (resist-coated in the case of transparency) PCB.
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