Light Up Component Bins and a Manual Pick and Place

[Mike] makes some very niche musical instruments, and the production volume he’s looking at means there isn’t a need to farm out his assembly. This means doing everything by hand, including the annoying task of picking resistors and other components out of bins. After searching for a way to speed up his assembly process, he came up with the Stuffomatic, a device that locates the correct component at the press of a button.

The normal way of grabbing a part when assembling is reading the reference on the board, cross referencing the value on the BOM, and digging the correct part out of the bin. To speed this up, [Mike] put LEDs in each of the part bins, connected to a Teensy 2.0 that has the BOM stored in memory. Clicking a foot switch looks up the next component and lights up the LED in the associated part bin.

[Mike] says this invention has speeded up his assembly time by about 30%, a significant amount if you’re looking at hours to assemble one unit.

If you’re wondering exactly what [Mike] is assembling, check this out. It’s heavily inspired by the Ondes Martenot, an electronic musical instrument that’s about as old as the theremin, but a million times cooler. Video sample below.

Continue reading “Light Up Component Bins and a Manual Pick and Place”

The Ondes Martenot; Better than a Theremin


[Ville] loves the sound of an ondes martenot and decided to build his own. No, it’s not made of vacuum tubes like a 1920s original, this one is made out of a cheap, off-the-shelf analog synth and just a few extra parts.

The ondes martenot is a theremin-like musical instrument; instead of waving your hands around aerials on the theremin, the ondes uses a small ring attached to the player’s finger on a wire loop and a volume lever. The ondes isn’t a common instrument by any means, but Radiohead uses one several in any event.

[Ville] began his build by taking a small, cheap, and new Korg Monotron analog ribbon synth, cracking it open, and reading the schematics. A 100k multiturn pot was wired into the monotron and fastened to a printed paper keyboard with a system of pulleys and a small metal ring. With the multiturn pot wired into the pitch input on the monotron, [Ville] had a semi-accurate and very functional ondes martenot replica.

You can hear [Ville]’s ondes in action after the break. It’s a little rough starting out, but by the time he’s looping multiple phrases it really does sound wonderful.

Continue reading “The Ondes Martenot; Better than a Theremin”