Mina Violin Electronics Adapter

thingiverse

Wanted to use a $12 CV-210E piezo pickup with active preamp found on eBay, similar to one sold on AliExpress at https://www.aliexpress.com/item/Electric-Violin-Pickup-Adjustable-Pickup-Piezo-Pickups-EQ-Parts-Accessories-20-12/32849083156.html?spm=a2g0o.productlist.0.0.6f8bfedbPjvFsI&algo_pvid=5f85d09c-6241-4f57-8ea7-90dcf375ce82&algo_expid=5f85d09c-6241-4f57-8ea7-90dcf375ce82-0&btsid=95760b89-7b24-48c4-bc72-72fead0080b5&ws_ab_test=searchweb0_0,searchweb201602_7,searchweb201603_52. So, I designed an adapter for the Mina violin. You'll have to remove the faceplate from the preamp and disconnect the battery terminals from the battery cover to use this design. Additionally, you'll need to replace the screws holding the mid-body pieces with ones 2mm longer, as the current ones are probably too short to accommodate both the jacks enclosure and the mid-body "wings." The walls of the jack enclosure are a bit too thick for the headphone jack to leave any room for its mounting nut, but there's enough space behind it in the jack enclosure for two 3D printed M8 nuts to fit in and keep it pressed up against its opening. You could use glue instead, or figure out another solution. The OpenSCAD files are included, but be warned that the code is very messy at present. There's no place to wire in a power switch yet, but I've left an opening for recharging a TalentCell 9V battery (available on Amazon at https://www.amazon.com/TalentCell-Lithium-Capacity-Rechargeable-Charging/dp/B07HNKK161/ref=sr_1_4?crid=38K331BJ2V4MF&keywords=micro+usb+9v+battery&qid=1557971648&s=gateway&sprefix=microusb+9v+b%2Caps%2C212&sr=8-4). In theory, one could power the violin while recharging the battery over micro USB. Be aware that the mounting screw holes on the preamp may not be symmetrical. I noticed this on mine, where they didn't line up with the holes in the print in one orientation but did in the other. Your results may vary. In theory, it shouldn't even be necessary to screw it in place since the preamp will be pressed against the body of the violin. Until I figure out how to add a power switch or give up on the idea, this design will remain marked as "Work in Progress," but everything should fit as-is.