Truss violin – I deigned, 3D printed and built a violin and I am releasing it open source August 18, 2023
Posted by GuySoft in open source, violin.Tags: 3D Printers, open electroncs, open source, violin
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Hey all,
In the past years I have had an ongoing project – I wanted an ultra-light modifiable electric violin. And finally I can share it with you.
This violin, weighs with all the parts on just 500 grams, which is the same as my acoustic violin. Moreover, the center of mass is close to the player making the violin feel lighter than an acoustic when playing.
This is made possible by an innovation I came up with, and have not seen anyone else do – The violin uses a truss like the one in a guitar neck, letting you balance the weight of the strings and tune the neck. This means that the violin can be printed with just a 15% infill making it ultra light (pegboard box at 20%).
I am not planning to start a violin-building business, so I see no reason to keep this to myself and I am releasing it. I ask you to give me some attribution, and consider releasing your design too. And perhaps a violin 🙂
This is the end result
The design
I made the design with the help of several mechanical engineers that I want to thank – Tal Reindel, Michael Lev-Ari Layoush, Itai Meshorer, and Don Corson. Also want to take the opportunity to thank Yair Grinberg, Oleh Shevchuk. It’s also based on the ElVioin v2 which is under the Creative Commons – Attribution – Share Alike license. So you can use it, share it, modify it and even sell it. But our particular design must also be released under the same license.
You can download the design files here.
(more…)Cheap USB interface to connect Ham radios and other devices to the PC October 14, 2011
Posted by GuySoft in Crictor, diy, Electronics, Hamakor, ITU, linux, open source, wireless.Tags: diy, Electronics, hacking, ham radio, open electroncs, open source
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Ham radio PC interface
Hi all,
As promised in my last post, I have finally finished designing and building a cheap interface to connect ham radios or any other audio device that does not share audio common ground to a PC, including a PTT interface. Price should be around $17 or 60 NIS. The control is done using a USB interface, so unlike most ham radio hardware that uses serial connections, this one is plug and play in modern PCs. The neat thing is that it uses them same commands as a RigBlaster. So this interface works out of the box with common ham radio programs like Echolink and Svxlink. The interface should also work with soundmodem which can be used for X.25 packet digital communications, without any extra hardware (I am still trying to get this to work). This interface could also be used to connect to other devices that don’t share a common ground. For example like phone lines.
Parts you will need
- TTL USB Serial interface – The main part is a simple CP2102 $4 controller that can be percussed from ebay. It simulates a serial device, meaning you can still work with older pieces of software with it. Note though you need to solder a cable from the RTS pin on the board, because normally they don’t come with a pre-made pin.
- Audio line isolation transformer – This can be easily salvaged from any old dial-up modem. That’s how I get mine, it seems to be much easier to get them off old modems than finding them in electronics shops, plus they are so easily identifiable (just make sure not to break the contacts when you take them out, happened to me twice). If you can’t find any old dial-up modems you can get it from ebay. (more…)
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