Layout optimization best practices: sources of your personal corpus (part 2)
Welcome back to our series on designing custom keymaps! After looking into how good/bad QWERTY is, the power of layers, and the potential of custom keymaps, last time we took the first real step by examining your options for compiling a corpus. As a recap: The corpus is simply a big chunk of text. We use this collection of textual data, often a single text file, to characterize your typing habits (calculating various language statistics), and feed it directly or indirectly as an input into layout optimization algorithms – to find the optimal keymap for you! Today we’ll expand on this idea by exploring your options if, like me, you prefer a personalized corpus rather than grabbing some general (and mostly irrelevant) data available online. Image 1: Letter frequencies – the most basic use of corpora – in this very post We've seen that a well-crafted, personalized corpus plays a key role in determining the outcome of the optimization process. We've also explored...
Sep 4, 2024
http://transition.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet62/oet62rev.pdf
According to this document, keyboards are not exempt from verification, and penalties for selling unauthorized devices can be steep: o forfeiture of all non-compliant equipment o $100,000/$200,000 criminal penalty for an individual/organization o a criminal fine totalling twice the gross gain obtained from sales of the non-compliant equipment o an administrative fine totalling $10,000/day per violation
Additionally CISPR 22 certification may be needed if you are selling in Europe.
I hope olkb and massdrop are not putting themselves at risk.
...why bring it up? Are you concerned about emissions?
I bring it up because of my curiosity about electrical engineering and the challenges of brining a product to market.
Also, the pcb is probably the only item that would fall under fcc jurisdiction and it probably qualifies as a sub assembly so it would be exempt. Now if he was selling a fully assembled board that might be a different scenario.
Pertaining to subassemblies: 15.101(e)Subassemblies to digital devices are not subject to the technical standards in this part unless they are marketed as part of a system in which case the resulting system must comply with the applicable regulations.
From the explainer document: (Note, however, that circuit boards or cards that are connected to external devices or increase the operating or processing speed of a digital device are considered peripherals.)
From these descriptions it looks like this keyboard/kit/peripheral/subassembly would fit under the description of Class A digital devices and their peripherals which means it would be subject to FCC verification.
Don't shoot the messenger.