Transistors, How do they work? | DON'T SUBSCRIBE
Why Electrical Engineering Stack Exchange recommends it
Electronics Stack Exchange askers cite it as the animation they learned diode and BJT behaviour from, usually when quoting a specific moment they could not reconcile with other material.
Recommended by 0 people across 0 different months, 2019 to 2023.
What it is
A short animated explainer from Sabin Civil Engineering on how diodes and NPN bipolar junction transistors work. It starts with silicon atoms and N-type and P-type doping, then covers diode behaviour, using a transistor as a switch and an amplifier, and a two-stage amplifier.
What people said
Cites Servietsky · 2019-01 · Electrical Engineering Stack Exchange · on “Why are the input and the battery connected in a transistor amp?”
I'm trying to make a simple boost pedal for my guitar using the simplest schematic I found. I'm wondering why the input is connected to the +9v battery in this schematic through a 430kohm resistance. There should be no such connection from what I understood in this video about transistors [this video] . Here is the schematic for the boost pedal I'm trying to make. [LINK] What happens current-wise where the two different voltages meet at R1? I found another schematic here that I understand better according to the video. [LINK]
Cites Serendipitous Epiphany · 2019-04 · Electrical Engineering Stack Exchange · on “In a forward bias diode, why do electrons continue into neighboring holes?”
When an electron from the n-type side fills a hole on the p-type side, it fills the valence shell. For reference, consider this video: [this video] . I learned in chemistry that atoms like this. So why do the electrons continue into neighboring holes if they are already part of a filled valence shell? I understand that part of it is from the electric potential of the battery attracting the electrons into neighboring holes. Is that it?
Cites Road · 2020-06 · Electrical Engineering Stack Exchange · on “TTL high input, outcome?”
My books states that when a TTL input is high, the emitter diode cuts off and the emitter current is approximately zero. This animation shows that when a transistor input is high, the emitter diode isn't cut off. [this video]
Cites user1621287 · 2020-07 · Electrical Engineering Stack Exchange · on “Are there two band contributions to diffusion current at the PN (diode) junction?”
My question (I hope) is a simple one. Are there two components of diffusion current (valence band AND conduction band) contributing to the generation of the PN junction voltage? If so, do those components stay exclusively within their respective bands across the junction and throughout? [LINK] Or is it like this: [LINK] Or are BOTH pictured paths involved? Can anyone refer me to a source that DOES go into that sort of detail in terms of current in both bands? Also, at the interface between the diode and the conductors attached to them, do valence and conduction bands both participate in electron current to and from their respective conductors, since the valence and conduction bands of conduc
Cites Moe · 2020-08 · Electrical Engineering Stack Exchange · on “What happens when base voltage is higher than the collector voltage in a bipolar NPN transistor?”
I did look up on YouTube and Google before I came here, the only thing that I don't understand is at 5:29 in this YT video [this video] It explained everything perfectly except when he said "If you increase the base current the collector current will increase proporionally" can you please explain that to me in a way that it makes sense
Cites user394334 · 2021-01 · Electrical Engineering Stack Exchange · on “Why will electrons move from hole to hole in the p type at forward bias, but not from hole to n type at reverse bias?”
I really don't understand what you mean. In this visualisualisation from 3:14 it is said and shown that the electrons jump from hole to hole: [this video]