3.5 mm (F) to BNC (M) connector adapter

thingiverse

It's easy to buy an adapter that's BNC (F) to 3.5 mm (M) but I've only found the other way in cable form, so I made my own. It could be used to adapt BNC jacks to accept 3.5 mm patch cables as used in modular synthesizers, or to connect a shortwave receiver antenna to a radio with a BNC connector. There is enough room in the center to add resistors for a pad network or other similar circuit. It could be shortened by 1 cm if this is not needed. Designed for use with the following non-printed parts: * BNC: Amphenol 112420 * 3.5 mm: Lih Sheng LJE0352-4R (another panel-mount 3.5 mm jack could be substituted with minimal changes, but be sure to consider the position of the leads and solder joints). * Wire or resistors as desired to make connections * Cyanoacrylate glue to assemble and secure the BNC connector This design has had only one revision. Caveats and possible improvements: * The specified hole diameters should probably be slightly larger; the housing edges did not quite meet each other, which is bad for secure gluing. * The bottom surface is not actually flat, but close enough for slicing. I considered printing it the other way up, as an "arch", and that might be better for other connector pairings. * The 3.5 mm end has sharp corners that could use some rounding. * Better choices of connectors could perhaps be made: BNCs which have a solder tab for the shield, and 3.5 mm which are more compact while still being feasible to mount and solder. The OpenSCAD code was designed to be generalizable to different connector pairings, but additional work would be needed to make it really usable that way; there are a few "it works by accident or hardcoding" elements. Also on GitHub: https://github.com/kpreid/3dp-connector-adapter-box