Mapping of the output characteristic curve of a triode - Page 1
Forum section: electronics / beginners

author: TimFox
author_rank: Super Contributor
timestamp: February 07, 2021, 03:48:43 am
content: I didn't bother to watch the video, since the curves shown on the introductory still are obviously for a pentode, not a triode.

author: jiangtao.lv
author_rank: Regular Contributor
timestamp: February 07, 2021, 04:06:18 am
content: Excellent, could keep an open mind

author: bdunham7
author_rank: Super Contributor
timestamp: February 07, 2021, 04:10:20 am
content: Quote from: TimFox on February 07, 2021, 03:48:43 amLanguage barriers can be funny. Your observation would be correct if the video was about vacuum tubes.

author: retiredfeline
author_rank: Frequent Contributor
timestamp: February 07, 2021, 04:14:12 am
content: I don't see any triodes in your video only BJTs but I only skimmed the video. You realise that triode refers to a vacuum tube device? Maybe you meant 3-terminal device? I've seen slightly off translations of terms from Chinese, like welding for soldering, tubes for multi-digit LED displays, and so forth.

author: jiangtao.lv
author_rank: Regular Contributor
timestamp: February 07, 2021, 06:42:29 am
content: my badwhat do you call these ones?

author: PartialDischarge
author_rank: Super Contributor
timestamp: February 07, 2021, 08:09:18 am
content: Bipolar transistors

author: jiangtao.lv
author_rank: Regular Contributor
timestamp: February 07, 2021, 09:30:12 am
content: I thought it was triode transistor.

author: TimFox
author_rank: Super Contributor
timestamp: February 07, 2021, 03:15:21 pm
content: In contemporary English, the term "triode" almost always means a vacuum-tube triode. There are other common vacuum tubes, such as tetrodes and pentodes, so the term "triode" is useful to distinguish them. Triodes have characteristic curves (plate curves) that are distinctive, similar to pentodes, that are very different from BJTs and FETs.Literally, a "triode" is a three-terminal device, which most (not all) active semiconductor devices are, so the term "triode" is superfluous.Yes, language differences and translation difficulty are interesting problems.

author: Electro Fan
author_rank: Super Contributor
timestamp: February 09, 2021, 03:39:38 am
content: Quote from: jiangtao.lv on February 07, 2021, 06:42:29 amNo worries. Your English language skill is probably better than a lot of forum members’ Chinese language skill.

author: Ian.M
author_rank: Super Contributor
timestamp: February 09, 2021, 06:03:45 am
content: Quote from: MasterTech on February 07, 2021, 08:09:18 amFormally speaking,bipolar junction transistorcommonly abbreviated to BJTThe closest type of transistor (in terms of its operating characteristics) to a thermionic triode, is the:junction field effect transistor, which is almost invariably abbreviated to JFET.

author: TimFox
author_rank: Super Contributor
timestamp: February 09, 2021, 02:46:21 pm
content: The JFET characteristic curves (drain current vs. drain voltage for different values of gate-source voltage) are closer to a vacuum pentode. The main difference in appearance is that the rise from the origin for a pentode is a single curve that branches off to the constant-current curves, while the JFET rise from the origin is a set of curves, with different slopes corresponding to the ON resistance as a function of gate-source voltage. The vacuum triode curves do not have a high-resistance region.