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  • Users: benta
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  1. benta

    How mount PCB

    "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...
  2. benta

    How mount PCB

    Velcro. Lets you remove/replace it if needed.
  3. benta

    A-arm ball joint cup - where to find

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

    Run BLDC form the 220V grid

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

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    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...
  6. benta

    Sallen Key Second order low pass Active filter-Butterworth and Bessel responses-Kc values.

    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...
  7. benta

    Complex numbers in Electrical Enginnering

    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.
  8. benta

    Tapped M3 Hole

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

    Replicate a bandpass filter

    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.
  10. benta

    What does index k in short-circuit current Ik mean?

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

    removing bearings from aluminum case

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

    removing bearings from aluminum case

    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...
  13. benta

    torque sensing with stepper driver

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

    Prototyping Power Supply (is there such a thing?)

    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.
  15. benta

    Operation of asynchronous engine in escalators moving down

    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.
  16. benta

    RC Transmitter - Variable type possible???

    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.
  17. benta

    Basic channel selector request

    A bistable relay would solve everything in the simplest manner.
  18. benta

    Power factor sign - JK Flip Flop

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

    240V 1ph 2 hots wires VS 240V 1 hot wire-N

    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...
  20. benta

    240V 1ph 2 hots wires VS 240V 1 hot wire-N

    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.

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