Questions tagged [spring]
8 questions
6
votes
3 answers
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
- 11,802
- 51
- 173
- 312
2
votes
1 answer
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
- 1,295
- 14
- 29
1
vote
2 answers
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
- 21
- 2
1
vote
2 answers
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
- 135
- 4
1
vote
3 answers
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
- 95
- 9
1
vote
0 answers
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
- 11
- 2
0
votes
1 answer
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…

roadrunner38
- 11
- 3
0
votes
0 answers
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
- 831
- 4
- 16