It's a naked piezoelectric buzzer.
Some piezoelectric crystal grown on a metal circle are the active part and the bottom contact glued on the back cover.
The top is then metallised to get the second contact.
Wires could be soldered to the contacts and/or the device could be cased in some plastic box but, since space is a premium here, it's used as is without ...
The answer depends on what phone this is exactly but here is my best guess for each spot:
The three big lenses are to provide different focal lengths.
The white spot is an LED for flash.
The smaller dark spot is possible the LiDAR.
The LiDAR would indeed help with 3d scanning and providing your phone with the data needed for augmented reality.
No one is working on it
because no one thinks they can make money creating a poor quality flat screen monitor. I doubt there is a technical limitation to creating a slow-refresh low resolution monitor.
I don't think it is a question of "consumer" vs. "professional" but really "burn" vs. "press". "Burning" a CD (or other optical media) is fundamentally different from "pressing". That is quite different from magnetic media (at least floppy disks, hard drives, tapes) where, AFAIK, there is no ...
Yes, overheating electronics will reduce lifetime. No, a properly designed thermal control system (even including CPU throttling) will not allow thermal loads which measurably reduce lifetime.
That is, within a reasonable temperature range, all electronics will last far longer than you will keep the laptop. So, do the obvious stuff like making sure the air ...
Figure 1. The user manual diagram suggests that the line out L/R are (RCA) phono sockets, not 3.5 mm jacks.
Figure 2. Phono to jack adaptor. Image taken from Google image search.
Figure 3. Phono plug dimensions. Image source: HiFi Collective.
The phono plug tip is 0.125" = 3.175 mm. The socket opening is probably just big enough to push a 3.5 mm jack ...
Unless the room noise is loud enough to cause physical vibrations in the playback head, leading to misalignment of the head vs. tape track (which could cause crosstalk or amplitude dropoff), there's no way that an acoustic signal can affect the flow of electrons in a wire.
BTW, it is true that some LPs show "print-thru," a situation where the ...
Bluetooth 4.2 + EDR.
From Bestbuy: Amazon Echo Show 5 Smart Display with Alexa - Charcoal
EDR is Enhanced Data Rate which means it is backwards compatible to other versions that implement EDR (2.1 + EDR & 2.0 + EDR). Wikipedia
The manual is on line at manualslib.com. The manual gives some suggestions for cleaning the elements. You might try the tests to see if the problem is confined soley to the one element or is normal to all elements.
The heating element may be nearing the end of its life. The elements are supposed to have shut off switches (fuses) to protect from shorts or ...
The biggest hurdle was the white light LEDs, which were first available commercially in 1996-1997, a few years after the blue light (1994) .
The following image compares all types of lighting
An 2018 article for Historical perspective on the physics of artificial lighting addresses many of your questions, and has the following image which summarises the ...