Questions tagged [spring]

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Opening fail-safe electrical strike door with a spring

I have a 12V fail-safe electrical strike currently installed and working on a door, but I want it to open slightly when it is powered down, but a spring apparently won't do as my strikes keep themself ...
1
vote
3answers
308 views

Why use a concave vs. flat mating target for pogo pins?

I'm doing some research into using spring-loaded pogo pin connectors with a mating target for a project I'm working on. During this research, I discovered that there is a concave mating target, yet, I ...
1
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0answers
72 views

Control magnet through stainless steel wall

I'm a mechanical engineer enthusiastic about learning electrical engineering and I speak french so I thank you in advance for your comprehension and your help. I would like to be able to activate an ...
1
vote
1answer
427 views

Mounting orientation recommendations for PCB spring antenna?

I have been looking at 868MHz through-hole spring antennas for an application, but I can't seem to find any sort of information in datasheets regarding layout recommendations. Here's the most ...
6
votes
3answers
1k views

What is the purpose of the spring used in point-contact transistor?

Below on the left side of the illustration there is a point-contact transistor which is the first transistor invented in 1947: It seems the symbol of BJT actually comes from this point-contact ...