I recently bought an Extron Crosspoint 12×4 RGBHV audio/video switch. I was quickly dissappointed by the non-standard audio connectors which are on this device. If you’re a chump like RetroRGB you can strip a bunch of female RCA cables and use 3.5mm Phoenix Screw Terminal connector to interface to the Extron’s audio inputs and outputs. But I’m no chump – I needed a real solution!
If you can’t be bothered to read this very short blog post, the source for the PCB is here:
Finding a Stacked RCA Jack
First I needed to find a stacked RCA stereo jack which would fit in the width of the 5pos Phoenix Connector. A quick tour on Digikey yield this resulted which seemed perfect for the job:
Next, I needed a way interface the CP-1435-ND RCA jack connector the 5pos Phoenix Connector without any wire stripping. I decided a custom PCB with 5 fingers which could be inserted in the Phoenix Connector’s screw terminals would be the best solution. I fired up KiCad and whipped up this simple PCB in a few minutes. I removed the soldermask from each finger and added copper pads on both top and bottom layers for each finger. If need be, I can tin those copper pads to improve the connection between this and Phoenix’s screw terminal.
Select a PCB Factory
I was a bit worried about the small size of the each finger on this PCB. I’ve ordered PCBs from factories in the past where they would definitely mess this up; such as dirtypcbs. I contacted the factory to make sure their tooling could handle this design. I went with Smart-Prototyping, I’ve had very good success with them in the past.
Wait a Few Weeks…
… hardware dev is long…
Test The Final Product
I am very pleased with the final product. I was worried about the PCB not being very sturdy in the Phoenix Connector – turns out with 5 screws holding it down it is very tight and reliable. I also tested with both tinned and untinned fingers, there seems to be no difference between the two – therefore tinning the fingers is probably not necessary.
As can be clearly seen, these are a match made in heaven for HDRetrovision YPbPr cables.
Source and License
This extremely simple design is licensed under the CERN OHL v.1.2. The source and gerbers can be found on Github.