Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [construction]

8 questions
50
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11 answers

How do I improve a simple home-made capacitor?

I was explaining to my son that a capacitor is simply 2 sheets of foil separated by a dielectric and rolled up and he said, "can we make one then?" I'm giving it a go. I used household aluminum foil and some parchment paper. I cut the foil into…
nuggethead
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11
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4 answers

Soviet-era mounting techniques to absorb vibration (THT components)

This question is about a historical point of view. I was watching this video about a Soviet-era dialer. As many Russian devices of that time, the construction is simple and in some aspects strange (designed with simple tricks to lower the cost). At…
gino
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7
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3 answers

Mechanical construction of PCB. What is between the layers?

I came across an answer about the construction of a multilayer board. It included an image showing the mechanical construction of a board (see image 1.) This prompted me to think of the actual construction a bit more. Image 1: Construction of…
joojaa
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2
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2 answers

Variance in winding a toroid

I'm building a filter from a kit with some given (microscopic pre-soldered SMT) capacitors and 2 toroids. It looks like the notch frequency is a bit too low with 10 wire turns around a T37-2 iron powder toroid and a bit too high with 9 turns. The…
hotpaw2
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vote
1 answer

Question about Disconnect Switches

I'm looking at an electrical construction drawing and I just keep forgetting what the disconnect switch notations mean. Refer to the attached image. This is what I'm assuming: the number in the first quadrant of the circle is the number of poles, 3,…
syed.karooney
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1 answer

Where to find winding diagram for a 56 pole 63 slot BLDC motor?

I'm working on an algorithm to control a BLDC motor with 56 poles and 63 slots. I'm using trapezoidal control. By employing usual switching sequence (CA - CB - AB - AC - BC BA) I'm missing one step in the six step commutation. Where am I going…
Vivek Vijayan
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3 answers

Crystal oscillator construction

I am not sure about how the crystal oscillators are made. Some say it has a crystal but some says it has an LC combination which requires a parallel capacitor to resonate with the internal LC combination.What is the actual construction.
kam1212
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Experimental low-pass filter construction using a NanoVNA?

Suppose I wanted to construct a no-solder plug-board or rats-nest low-pass filter for VHF frequencies, but without the "proper" circuit substrates, design software, or test equipment. Could an inexpensive NanoVNA be used to test and incrementally…
hotpaw2
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