Just made my own SFP-to-USB module!
Similar to the sfp2usb module from XillyUSB, but with a smaller Type-C receptacle instead of a Micro-B, and using CH32X035 RISC-V MCU + PI3EQX10612 redriver for automatic orientation detection & configuration.
Yet another cursed connector :P
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I get asked the question a lot about what bits I use to get such sharp traces on my CNC machined PCBs.
Typically all of the bits I use are from PreciceBits https://t.co/B0mqAT4FPT
The specific bit I use depends on the pitch, how much copper area clearing I'm doing, and how nice I want it to come out. Using less expensive bits tends to leave more burrs, but a quick pass with a fine sanding sponge cleans it up and saves tool life on the more expensive bits.
In this case when I'm routing edge connectors to slide into these PCIe sockets, I would rather have nice crisp edges for the contact pads without any burrs to catch on the contacts, so I chose a better bit.
For this board, it's straight off the machine with no post sanding/processing using an EM3E8-0071-15VC which is a 0.18mm zirconium nitride coated 3 flute 15 degree tapered stub.
I do a 0.085mm DOC with 15k RPM speed, 680mm/min feed, and 250mm/min plunge.
If I'm doing finer 0.5mm or closer coplanar trace to copper clearance, I go to a 0.13mm tapered stub.
For the contour cuts including mount holes larger than my shank I use 1.59mm 3 flute soft media cutter, which are also ZrN coated. MM3I8-0625-031FC.
Routing tiny slots like the mechanical through hole tabs on USB-C connectors I use 0.56mm 3 flue soft media cutter MM3I8-0220-009FC
How to analyze an RF PCB and the signal path.
In this thread I will show you how to understand various sections of a real world product (thinkRF's 28GHZ downconverter), without having access to block diagram, schematics or even test equipment.
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