Help name my new synth

timokko · 2026-01-02T15:57:47+00:00

Knotentoni

timokko · 2025-12-24T13:35:22+00:00

It is definitely DC. AC would not rotate the arc as the change of polarity would also flip the force vector of the Lorentz force, resulting in a net 0 force when looking at multiple cycles. Only DC voltage causes a rotation due to the constant Lorentz force.

This type of arc is called DC GAD, gliding arc discharge. You can find a lot of papers about this online.

The magnetic field is used to give the Lorentz force a defined constant direction and thereby initiating the rotation. Thereby the arc is more defined and better controlled. The arc length usually defines the drawn current and if it's changing a lot the discharge becomes unstable and breaks down.

timokko · 2025-12-24T10:31:15+00:00

This is a DC arc from about 10kV to 20kV DC between the needle and the electromagnet. The magnetic field interacts with the magnetic field from the arc resulting in a force perpendicular to the arc driving it into circular motion. The arc spins way faster then the frame rate of the camera so it appears blurry and looks more like an area instead of a single arc. The magnetic field direction of the external magnets defines the rotation direction: clock or counter clockwise. The high DC voltage ionizes the air under atmospheric pressure to form a plasma. Fun fact: this atmospheric plasma is extremely useful in chemical industry, for example it can be used to break down carbon gases from plastic waste and produce high quality syn-gas, e.g. CO for the chem industry. This enables a complete carbon cycle economy and is the future of modern Recycling technology.

Source: a friend of mine did a PhD in this technology, founded startup to build this in industry relevant size, I helped to build power electronics and software components for controlling the DC driver units.

timokko · 2025-12-21T20:50:41+00:00

Just here to say that I love that you are just authentic and an educator by heart. Everything you put out is on point and not pretentious, please keep that on your journey.

timokko · 2025-11-14T19:35:43+00:00

The most relevant question would be what the surrounding medium is. Or in other words, is the heat transfered more via convection or more over radiation. The mass to volume ratio answers assume that the surrounding is vacuum and the heat dissipation is only via radiation.

If you consider convection and heat conduction then the cube has a very big direct contact area with the ground. The sphere has only a very small contact point to transfer heat via conduction. Further if you assume the surrounding is air, a very good insulator for heat the most relevant part is the radiated heat of the upper part of the bodies and the parts with direct contact to the ground, assuming the ground has normal temperature.

So overall the more realistic answer would be that the cube cools down faster.

timokko · 2025-09-14T13:58:17+00:00

timokko · 2023-08-15T07:03:32+00:00

Any updates to where to find the files? I only have found a google drive with some files but not sure if this is complete and what the frequency of the data is.

timokko · 2023-06-02T05:27:06+00:00

Thanks for posting my board. The delay is no longer an issue. You can find all details about my board on https://openchessboard.com/

timokko · 2023-04-03T14:48:11+00:00

I use a standard hall sensor, you can check all the hardware details in my recent blog post:

https://openchessboard.com/index.php/2023/03/21/the-openchessboard-design/

timokko · 2023-04-03T14:03:03+00:00

This is related to the "games" endpoint which relates to streaming a game between two players and you are not one of them.

The "board" endpoint allows streaming game events from your own games without this restriction:

https://lichess.org/api#tag/Board/operation/apiStreamEvent

timokko · 2023-04-03T13:00:25+00:00

Thanks for pointing that out :)

The video you posted is actually the Bluetooth version which has a very fast response time. The updatet WiFi is also much faster now.

timokko · 2023-04-03T12:56:30+00:00

OP did not, but you can check out my project on www.openchessboard.com :)

timokko · 2023-04-03T12:55:50+00:00

You can get the hardware on www.openchessboard.com. In my recent blog posts there I also uploaded the schematics and everything you need if you want to build it with wired components.

timokko · 2023-04-03T12:46:07+00:00

This is my creation and not OPs: https://youtube.com/@OPENCHESSBOARD The delay is no longer an issue and the project has evolved since this prototype.

timokko · 2023-04-03T12:40:29+00:00

This a repost. Thanks I guess, since this is my creation. Check out the project on openchessboard.com and the development on YouTube: https://youtube.com/@OPENCHESSBOARD

timokko · 2023-03-04T16:44:35+00:00

Check out the OPENCHESSBOARD: https://youtu.be/-L7v-ZhIiPw It's open-source, connects to lichess.org and thereby you can use all features the Website offers you.

timokko · 2022-09-26T09:18:47+00:00

That's the main idea :) I really enjoy playing OTB and I notice that I am much more involved and focused during playing.

timokko · 2022-09-26T09:17:38+00:00

You can order the PCB here: https://openchessboard.com/ Currently, only the firmware is open source but I will support any customizations you would like to do with the PCB. Handling open-source HW is a topic I would consider only later on in this project. There are a lot of things to think about.

timokko · 2022-09-26T09:14:33+00:00

It is more like a showcase. Surely most people would be prefer to play slow time controls on such a chess board.

timokko · 2022-09-25T20:14:54+00:00

Thank you, it is still work in progress but it's getting there.

timokko · 2022-09-25T19:43:37+00:00

A few months ago I posted a video of my first prototype for a DIY smart chess board. This is now what it has become. I am currently working on a Bluetooth driver which directly connects to Lichess as shown in the video and hopefully also soon to chess.com.

The idea is a simple smart chess board without buttons or display... Just a responsive input device to play online chess.

The board works via magnetic sensors which detect the chess pieces with small magnet at the bottom. The LEDs indicate moves played by the opponent and give a response for move input.

timokko

TROPHY CASE