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"Velcro should be used with some caution. It is easily removed by peeling forces, but with a rigid circuit board, there isn't the chance to peel." Apologies. I should have been more precise and used the term Velcro Pads. Small round or square pads that release well, and are extremely useful in...

Velcro. Lets you remove/replace it if needed.

Moog comes to mind: https://www.moogparts.com/ They only deliver the complete ball joint, though.

For maximum power density and direct 230 V use, a universal motor comes to mind. They tend to be noisy, though.

IR, you're right, but the explanations in the book is deficient, to say the least. I've read the chapter in question, and what is an attempt from the author to "dumb down" things results in the exact opposite. By inventing/introducing obscure terms like KC, it actually gets more difficult to...

Sounds like a lousy book. I don't like using f (frequency) in analysis. angular speed is the variable to use (ω = 2πf). Second order filters (or any other orders) are defined by their transfer function, which you should know, and this includes ω0 and Q. Only for Butterworth LP transfer...

You don't have to use complex numbers. The basic way is to use differential equations. These are hell to solve, though. By transforming the equations into the complex symbolic space, they turn into normal algebraic equations that are much easier to work with.

Why not just a blind rivet? Do you need to disassemble it afterwards?

Well, it seems to be a second-order conjugate pole bandpass filter, so why don't you plug in the second order transfer function into a graphing tool and play around with Q or damping factor? This is even easily done in Excel or other spreadsheets.

IK is indeed short-circuit current and appears in many Germen textbooks as such. Your reference to "Kurzschluss" is right.

"disrupt the grain structure" That's why I mentioned Dural, where it's a problem. But cast should be OK.

Aluminium has a higher expansion rate than steel, so just heating the whole thing should release the bearing. But if you're out of luck, it's also been loctited. You'll probably need to go up to around 200...250 deg C to get it loose. I wouldn't expect problems with the aluminium if it's cast...

Ummm... the stepper motor drives I've worked with use current drive for the coils.

Astec Power used to have a modular power supply system with a common power frame where different modules could be plugged in. They seem to have been acquired by Emerson, so I don't know the current status.

My main question about escalators is: why are the handrails always a bit faster that the escalator itself? I've never found a reason for this phenomenon, which should be easy to solve. Sorry, totally OT.

27 MHz? Forget it. That band is so polluted with CB radios, babyphones, garage remotes etc. It's like harpooning a fish in a mud bath.

A bistable relay would solve everything in the simplest manner.

I have a bit of difficulty understanding why sign is a problem. Could you elaborate?

Perhaps I didn't understand the question completely. From what I read, you have equipment with a 230/240 V input, L + N. You can supply it from 230/240 V L + N of course (that's what it's built for). And yes, you can supply it from 120/120 V split phase (=240 V) as well. No problems. As Keith...

If it's standard 230 V single-phase equipment as used in for example the EU, it doesn't matter. It's laid out so you can reverse live/neutral with no problems. This to ensure that noone/nothing gets damaged if you reverse the plug or the electrician did a bad job.