Questions tagged [spring]

8 questions
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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 transistor even though they operate very different…
user16307
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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 detailed datasheet I can find for the type of antenna I'm…
Sensors
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Why is a spring used in an electrical switch?

Note: I am not talking about a circuit breaker where a spring is used to counter the repulsive force generated by current passing through a small contact area. This question is about switches designed for high currents (kA to MA range). The current…
user146021
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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 locked if they have a constant force acting on…
Neil
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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 have only seen flat ones on products. Why would…
Davbog
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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 electromagnet to pull a pop-up switch throught a…
user210482
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Electrical motor/generator to represent variable spring damper system

I would like to build a system that represents a rotational double mass spring damper system with one set of spring and damper being represented by an electrical system. See image. The first mass (J1) is connected to earth via a rotational spring…
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Connecting a battery lead without soldering

I have this battery with two leads, much like a capacitor. Due to several constraints (size, labor, etc) i am looking for a way to mount it without soldering. Simply pushing it in place would be great for the assembly process. Is there any type of…
TQQQ
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