IRC log for #qi-hardware on 20160413

00:56.52DocScrutinizer05hmm, it's mainly a question of presets and people not changing them
00:58.41DocScrutinizer05using such style http://wstaw.org/m/2016/04/13/plasma-desktopJV2219.png you never will get decent schematics ;-)
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04:11.41wpwrakoh, hadn't even spotted this one. that's hardcore old-style ;-) at least it doesn't also mix connected and unconnected "+" crossings. though it has the connected variant.
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05:48.44azkaySay I get one of these: seeedstudio.com/wiki/Grove_-_FM_Receiver seeedstudio.com/wiki/images/7/70/Grove_-_FM_Receiver_v1.0_sch_pdf.pdf
05:49.08azkayApparently, I can run it standalone without getting a Grove board, but it won't remember the frequency I'm on.
05:49.53azkayI don't want to use a microcontroller, I just want a (what I thought was simple), analog volume wheel, and to set it to a permanent frequency. Apparently no one sells a module like that
05:50.18azkayAny ideas on modifying something like this for that? Or am I going to just have to use a microcontroller?
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09:07.02DocScrutinizer05I think that chip is designed to do soft-off and keeps settings as long as you don't cut the power supply
09:07.33DocScrutinizer05anything else wouldn't make any sense, chip design wise
09:08.14DocScrutinizer05of course it has no persistent storage
09:09.04eintopfpopulate radio transmissions over flying robots -> use case, which you can see in fallout games
09:09.10DocScrutinizer05if only because it's a tad more complicated to integrate flash cells and RF structures on same die
09:21.43DocScrutinizer05azkay: the chip will remember the settings as long as you don't remove the batteries
09:23.12azkayI seeeee. You always come to my rescue :P
09:23.37DocScrutinizer05if you'd want to have a hardcoded fixed frequency, you would either need a chip that allows flashing that frequency, then you can't change it without using a flasher. Or the chip would need at least 8 inputs to select the FM channel binary, incl finetuning
09:24.01DocScrutinizer05I don't think either exists
09:24.17azkayThanks for the info :), as always
09:24.29DocScrutinizer05yw :-) thanks for finding that chip
09:24.33azkayGotta goooo, have a train to catch
09:24.36azkayNo problem
09:24.44eintopf8 inputs? could you not use some ADC
09:24.55eintopfwith one input
09:25.13DocScrutinizer05well, that would be possible in theory but *highly* unlikely with a PLL tuner
09:25.33eintopfok.
09:26.47DocScrutinizer05the smaller and simpler the chip, the more basic the interface and the higher the percentage of digital circuitry inside
09:28.04eintopfI thought some potentiometer connected to some pin to setting the freq
09:28.21eintopfthat's what I think how it's realized when I tune my channel on the radio
09:28.41DocScrutinizer05analog tuning the way you suggest is both highly difficult to find the right potentiometer for that actually allows tuning to a station and stay there, and the chip needs pretty high accuracy A/D too
09:29.05eintopfok
09:29.38DocScrutinizer05how many turns has your dial for station setting on your radio? 0.75? for sure not
09:30.09eintopfI have some digital radio tuner like the above one inside my mp3 player
09:31.08DocScrutinizer05with a normal 270° potetiometer for tuning? That must be real fun to adjust it to a station
09:31.20eintopfno
09:31.36eintopfI can press buttons and it writes some registers
09:31.43eintopfinside the radio chip I suggest
09:32.02eintopf0.1 Mhz
09:32.04eintopfis the space
09:32.19eintopfaccuracy
09:32.44eintopfI don't like the transceiver, always makes a noise when switching frequency
09:32.49DocScrutinizer05well, I guess it uses an external serial flashrom
09:32.53eintopfI think it's software related
09:33.01eintopfok
09:33.26DocScrutinizer05it's really difficult to build flash and RF circuits on same die
09:34.21DocScrutinizer05most likely even completely different technologies are used for flash and for RF mixing and amplification and filtering etc
09:34.48eintopfDocScrutinizer05: http://www.rockbox.org/wiki/SandiskE200HardwareComponents#FM_Chip
09:34.53eintopfit's this
09:36.22eintopfaudio components are always critical... I remember some old mainboard with on-board audio
09:36.34eintopfdid some noise, when transfer data over ethernet etc
09:36.46eintopfI think you can all deal with that
09:36.53eintopfbut then you need to really know what you doing
09:45.20DocScrutinizer05eintopf: http://wstaw.org/m/2016/04/13/plasma-desktopzj2219.png  increment encoder usinf two coils and prolly a turning magnet or the like
09:50.26DocScrutinizer05hmm no, not sure about that
09:52.09DocScrutinizer05in fact the whole LV2400x series is with digital interface to a controller MCU only
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09:57.32DocScrutinizer05oops 24020 nicht 24002
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10:04.47DocScrutinizer05fuer 24020 gibt's wohl kein datasheet
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10:24.10eintopfnaja, ist ja auch nicht so wichtig
10:24.35eintopfradio ist gut wenn der weltuntergang losgeht
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13:25.31roheintopf: sag bescheid, ich hab noch ein studio-mischpult aus den 80ern dazu ;)
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15:18.12whitequarkDocScrutinizer51: you could make a multi die assembly
15:18.23whitequarkbut I guess that increases cost too muc
15:19.18DocScrutinizer05yep, aware of this and the cost it incurs
15:20.01DocScrutinizer05not very practicable for those lower-end pricerange chips
15:20.09whitequarkI wonder why they never do it for large CPUs
15:20.16whitequarkfor first-level caches
15:20.18DocScrutinizer05err they do?
15:20.23whitequarkwell
15:20.25DocScrutinizer05hm?
15:20.28whitequarkI know that SPARCs use eDRAM for L4
15:20.33whitequarkand I think L3?
15:20.34DocScrutinizer051st-level cache in flash?
15:20.37whitequarknonono
15:20.39whitequarkSRAM
15:20.45whitequarksince you have the same problem with logic and SRAM
15:20.52DocScrutinizer05aah yep
15:21.02whitequarksorry I am being unclear, SRAM is expensive and DRAM is incompatible with logic
15:21.14whitequarkso you could put logic on one die and eDRAM for L1/L2/L3 on an immediately adjacent one
15:21.19whitequarkmaybe even stack them!
15:21.25whitequarkadd an interposer and some TSVs to connect
15:21.35DocScrutinizer05:nod:
15:21.52DocScrutinizer05I seem to have seen similar composites
15:22.00whitequarkI'm sure this raises the cost substantially but with xeons of $1k upwards it can easily be profitable
15:22.32DocScrutinizer05well, SRAM is very fast
15:24.06DocScrutinizer05easy timing, low energy consumption
15:24.25DocScrutinizer05hmm the latter depends
15:31.21DocScrutinizer05about time to have some fun with Otto-engine tuning ;-)
15:36.06whitequarkDocScrutinizer51: https://en.wikipedia.org/wiki/High_Bandwidth_Memory
15:36.10whitequarkalready happens apparently
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