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What analog projects are you after in 2022/23?

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RJSV:
Rebonjour jonpaul, Merciboucou voltra response!
   I'm curious, still, so that's a flash convert, spanning the equivalent of (less than) octal or 3 bits.  Octal binary would do 7 individual states. Must have been horribly distorted AUDIO if they converted back !
  Did not quite understand the conversion rate mentioned.  Sorry, smartphone only, no PC access to read that, (plus, subscription IEEE).
   Maybe wouldn't have hurt, if they included a 'dead line' indicator, for input = 0...that being 6th state ?
- Rick (RJHayward)
EDIT:
   Also was thinking that the logarithimic scale maybe helped convert (audio) with less perception of distortion?  And, sivousplai, which way (log or exp), are the 5 steps, above 0 getting larger and larger, each step?  OR, was AC, centered on '3rd' lamp, plus or minus 2 steps?...(that is; -2, -1, 0, +1, +2) ignoring the logarithemic characteristic.)
AND, please, was it really a scrambler, I mean with a 'key Code', in case enemies spy had the hardware design?  In other words, just the novelty was considered so 'out-there' as to be secure.

niconiconi:

--- Quote from: rstofer on November 25, 2022, 01:32:38 am ---
--- Quote from: VSV_electron on November 25, 2022, 01:22:52 am ---Anyway - what are your interests in the analog electronics in the age of total MCU dominance?

--- End quote ---

Analog computing to solve differential equations.

--- End quote ---

Today I just found several "exercise for the readers" questions on analog computing from EAI Handbook of Analog Computation (1971), I'm going to try solving a few of them in 2023 to learn some basic physics and electronics simultaneously.

niconiconi:

--- Quote from: RoGeorge on November 26, 2022, 08:27:33 am ---Fun note, the name itself of "analog" electronic came from the fact that linear circuits with R, L, and amplifiers can be an analog of the differential equations met in the physical world (analog circuits able to simulate, and thus solve, other non-electronic problems we face in our day-to-day real world).

--- End quote ---

To be clearer, it's called analog because the circuit is an electrical analogy of a mechanical (or some other physical) system.

The etymology of the term "analog" in "analog circuit" was quite interesting indeed. Apparently, the first recorded usage of the term "analog" was specifically used in the context of analog computing, as an adjective before the term "computer" (initially as a reaction to "digital", as digital computers started to see its uses). Later, opamps became general-purpose circuit components, so "analog" started to be used to describe "circuit". Eventually, all circuits without logic are described as "analog circuit".

https://readingjimwilliams.blogspot.com/2014/01/the-history-of-analog-part-1.html

rstofer:

--- Quote from: niconiconi on December 04, 2022, 02:34:48 am ---Today I just found several "exercise for the readers" questions on analog computing from EAI Handbook of Analog Computation (1971), I'm going to try solving a few of them in 2023 to learn some basic physics and electronics simultaneously.

--- End quote ---

I have #4 pretty much under control and I have done #1.

niconiconi:

--- Quote from: VSV_electron on November 25, 2022, 01:22:52 am ---In the old day everyone was building am radio receivers (I built one myself when I was 12) but who's working on them these days?
Anyway - what are your interests in the analog electronics in the age of total MCU dominance?

--- End quote ---

In the age of total MCU dominance, analog electronics still never really went away, it's always working in the background to play its specialized roles to support digital applications: input signal conditioning circuits in front of ADCs, an amplifier with low noise (or high bandwidth / low DC drift and offset), microvolt signal amplification for sensors, closed-loop control systems, a power supply with fast transient response (or low switching noise, or high efficiency), power distribution on a circuit board without parasitic resonance, and the likes. It often doesn't sound cool or fancy, but there are still interesting circuits to play with. Today's analog projects are largely driven by digital controllers, but analog circuits are still here, often performing serious tasks. Sometimes the MCU is just here for doing housekeeping tasks, such as driving a display or reading the buttons, It's the analog components that perform the actual work.

Furthermore, RF/microwave electronics is more important than ever today, ironically, at least partially due to the digital dominance. For modern Gbps digital links, basic knowledge of RF/microwave test and measurements is required. I spent a couple of weeks this year on measuring the impact of parasitic capacitance of protection components up to 500 MHz for a digital application. Also, even in the most advanced digital Software-Defined Radio systems, it still needs a good analog RF front-end design to function. With today's inexpensive electronics and circuit boards, DC to 1 GHz is now within the reach of many hobbyists, the future is bright.

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