Jameco also supplies mid level engineering firms, so similar to application notes. Think automation integration company buying xyz specialty robotics controller.

I think of mouser as more like digikey, so I don't really know why they would have similar educational information above the level of PCB board component. But, they may also have business in the low-quantity higher margin business.

Tldr: not seo. Customers actually need to know about the product

People like HVAC installers -- I've seen most of that on YouTube, where there's a chance of monetizing the content. I've repaired nearly every appliance in my house, thanks to blogs and videos posted by strangers.

The Digikey articles I've come across are well written. This article however is artificially inflated using SEO style writing. I mean after they supposedly explained servo motors you'll find this ugly sentence further down: "Still, how does a servo motor work?" I mean holy shit man, do you even care about your writing or the subject? Likely not. And really, the article is so light on details its barely technical and only talks about the RC servo. This is pretty much junk.

I want to say that I remember seeing this page in high school in the late 00s, although the Internet Archive only seems to go back to 2012 for this exact URL.

Omega Engineering used to (still does?) publish a set of absolutely massive hardcover catalogs on sensors and industrial controls that contained detailed tutorials and theory of operation. In some cases, they published entire books devoted to teaching you how stuff worked. Their Temperature Sensors Handbook always had a place on my bookshelf for many years.

Being able to run an even just very simple digital controller allows things like severely dropping negative feedback gain at a resonance frequency of the larger system. And so much more.

One of my most amusing applications was the client who put an R/C servo on the choke cable of a carbureted generator motor instead of spending more money to buy the fuel-injected version. Servo cost about $5 and we were already measuring air temperature and had a PWM output available.

If that sort of thing interests you, there’s a whole field of control theory to study.

Interactive diagrams + code

https://www.actronic-solutions.de/files/actronic/FTPROOT/Fie...