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solving my home audio problems by building a DSP based audio mixer to route all devices through it can do 10/10 stereo pair routing (8/7 implemented right now), every output has a dedicated mix output with levels, mute, and solo. integrated an airplay receiver and a headset amplifier I built back in 2016 as well. mixer core is a SigmaDSP ADAU1442, and an ESP32 driving the business logic and providing a web UI to control the settings did all the analog inputs as balanced with a mix of consumer and professional levels. there's also 1 S/PDIF input and 3 S/PDIF outputs. control UI is printf() html:   every input & output has 3 second order filters available:   to fit into a repurposed 1U rack box I had to use non-standard SP13 connectors, so made a couple of these 3D printed breakouts to go to XLR/TRS, using Cat5 SFTP cabling to carry a balanced stereo pair  here shown connecting the minidisc recorder's analog outputs the DSP is currently sitting at ~2500/4096 instructions per audio sample so still have some spare capacity there, they're pretty beefy future work is to build an expansion board to add the remaining 2 inputs and 3 outputs that were left in a header strip on the main board, will add USB audio input, an additional S/PDIF TX/RX pair, and 2 more analog outputs just waiting for an "XMOS U208" based USB-I2S converter board to verify how it works and will be ready to order the PCB for that
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Dec 30, 2023 13:26
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very cool!longview posted:did all the analog inputs as balanced 
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Dec 30, 2023 14:05
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I spent 2,000 hours coding an animal adoption site called Meowseum and got carried away, added video validation/processing, and let it sprawl into Instagram but without filters, but I didn't add the part where animal shelter could register its details. It has jQuery Mobile so that users can navigate a gallery by swiping, added a night mode but not the part where an animal shelter could register its details... I'd been sending mock-ups to a former graphic designer for Nokia, who would inspect them and offer advice for improvements.  Sometimes I think about going back to it and trying to find investors on some place like Kickstarter, but I think it's best that I leave it alone. After I stopped working on that, I tried spending 600 hours coding a program that scrapes location data in order to resell it, but over four years, two of the ten test franchises switched APIs. It was taking less and less time per API the more I worked on the project, 40-50 for the last one (Kroger), but I don't feel like doing it anymore. I should've ignored all the API information except for the address data, the minimum to test the superclass, rather than wasting time testing that collecting all the info like store hours worked. galenanorth fucked around with this message at 18:42 on Jan 5, 2024 |
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Jan 5, 2024 18:32
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sorry for the double-post, I pressed the wrong button
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Jan 5, 2024 18:35
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I recently acquired an old bus flip dot sign and am using it as an excuse to learn a little electronics and basic programming poo poo while I look for a job. fortunately, the model I have has a really well documented control protocol. my goal is to have it display etas for the bus and the train on its tiny rear end 23x10 pixel screen via an esp32. here's everything I have to do and learn: get parts flash the esp32 with arduino modify the control software code to work with my smaller sign actually test the sign lol wire the sign for 24v, 12v, 3.3v, and signal pull next arriving bus and train info from the mta write the whole app to pull everything together mount buttons for control pack it all in the housing mount it somewhere that's a lot of poo poo to do, so naturally I'm learning how to flash the firmware on my new pinecil
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Jan 9, 2024 17:01
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nice. just getting it to display whatever you want is pretty fun. i had a decent time just making my ppd220red say random poo poo for a while once i got it hooked up and functional
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Jan 9, 2024 19:15
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theflyingexecutive posted:I recently acquired an old bus flip dot sign and am using it as an excuse to learn a little electronics and basic programming poo poo while I look for a job. fortunately, the model I have has a really well documented control protocol. that's really cool but is the sticker price correct? didn't think those things would be so expensive.
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Jan 9, 2024 19:28
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my little led sign (the ppd220red) was something like $80 off ebay but if you try and buy one from the manufacturer i'm pretty sure they want four digits for it e: little signs like that are surprisingly expensive
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Jan 9, 2024 19:35
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I forget the manufacturer but I remember seeing single-pixel flip-dot displays. Someone used it as a needs-water/water-ok indicator for a plant soil sensor. Unlike an LED or whatever it consumed no power unless flipping the dot, so that was neat.
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Jan 9, 2024 20:14
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probably e-ink, with no pixel addressing so it just flips all the cells at once sometimes I wonder how much those credit card sized e-ink displays cost that big box stores are using for prices. a single store must need thousands of them
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Jan 9, 2024 20:20
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a quick search for "electronic price tag" suggests they're about $20 for individual units and $10ish in bulk
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Jan 9, 2024 20:27
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haveblue posted:probably e-ink, with no pixel addressing so it just flips all the cells at once Nah it was definitely a flip-dot, in a cute little bubble capsule for viewing, with a red side and a green side. e: loving found em, I remember the manuf name now, Alfa-zeta https://flipdots.com/en/products-services/status-indicators/ The Eyes Have It fucked around with this message at 21:03 on Jan 9, 2024 |
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Jan 9, 2024 20:58
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I've wanted to make a poster sized game of life out of some static medium for as long as I can remember. A GOL poster that updates once a day. A cheap flip dot implementation would do the trick nicely, but the wiring sounds hellish.
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Jan 9, 2024 21:16
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I was looking into things like flip-dot screens and due to the cost, finally settled on this: https://www.amazon.com/gp/aw/d/B088BTXHRG?psc=1&ref=ppx_pop_mob_b_asin_title it’s a 8x32 grid of WS2812B leds… it’s ~$19 it’s flexible it’s bright as hell it’s easily programmed via ESP32 with either the neopixel or FastLED frameworks I really like it a lot, and scrolling stuff across it is super legible and eye-catching. but alas, I got distracted and didn’t build anything super “real” with it and now it lays dormant... for now
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Jan 9, 2024 21:25
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galenanorth posted:I spent 2,000 hours coding an animal adoption site called Meowseum and got carried away, added video validation/processing, and let it sprawl into Instagram but without filters, but I didn't add the part where animal shelter could register its details. It has jQuery Mobile so that users can navigate a gallery by swiping, added a night mode but not the part where an animal shelter could register its details... I'd been sending mock-ups to a former graphic designer for Nokia, who would inspect them and offer advice for improvements. where the hell did you get 2600 hours to hobby code, are you a patent clerk or something?
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Jan 9, 2024 21:56
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spankmeister posted:that's really cool but is the sticker price correct? didn't think those things would be so expensive. yup, they're vanishingly rare, heinously difficult to make and maintain, and outclassed by leds in every possible way
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Jan 9, 2024 22:05
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Zamujasa posted:nice. just getting it to display whatever you want is pretty fun. i had a decent time just making my ppd220red say random poo poo for a while once i got it hooked up and functional here's the protocol I'm looking at. thank gently caress this dude compiled all the initialization codes, because that would have been almost impossible to reverse engineer https://alusch.github.io/flipdot-protocol/
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Jan 9, 2024 22:12
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crackin it open ooooodles of space for the power supply and esp32 hm don't really wanna deal with this bullshit automotive connector, where does it go?  mmmmmm, much better  let's pull the display off and peek at everything else. er...  there are four of these standoffs and two of them are under the soldered-in flipdots 
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Jan 10, 2024 22:43
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where's a good place to get a small low-voltage project parts*? amazon is kind of a minefield for this sort of thing, radio shack has been dead for decades, and I'm not sure where else to look *specifically, a waterproof switch
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Jan 14, 2024 21:18
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haveblue posted:where's a good place to get a small low-voltage project parts*? amazon is kind of a minefield for this sort of thing, radio shack has been dead for decades, and I'm not sure where else to look aliexpress, ebay or the bigger suppliers like Farnell, RS, Digikey, Mouser et al.
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Jan 14, 2024 21:33
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amazon or ebay, if it's for an idiot spare time project. yeah they're minefields full of counterfeits but honestly most small electronic parts just either work or they don't. 99% of the time they work. i'd search for waterproof switch and find one with 5 stars and 1000 reviews and it's virtually certain to be fine. if you need guaranteed quality or reliability, digi-key or mouser and look for real brand names like omron, hirose, etc. Sagebrush fucked around with this message at 21:37 on Jan 14, 2024 |
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Jan 14, 2024 21:35
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this project is of medium idiocy (repairing a battery-powered home device) so I'll suck it up and use amazon thanks
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Jan 14, 2024 21:50
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theflyingexecutive posted:hm don't really wanna deal with this bullshit automotive connector, where does it go? that looks like a normal cpc series 1 13-7 standard sex i think 211399-1 ought to be the mating part if it really is some oddball environmentally sealed automotive connector, then never mind
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Jan 15, 2024 02:45
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Raluek posted:that looks like a normal cpc series 1 13-7 standard sex That's it! It's  though and I'll be mounting all the additional hardware in the case anyway, so away it goes.
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Jan 15, 2024 03:09
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5ish from tti, but if you don't need to exit the case with those signals anyway then heck with it
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Jan 15, 2024 03:43
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I have this weird dream that refuses to die of making a vacuum tube computer kit with a single logic gate and a USB interface, so you can simulate all of the logic gates in whatever design by feeding them to your little tube one at a time with a real computer. This is of course pointless as anything but a curiosity and history lesson, but boy do I love both of those things! You can see the filament glowing in this one. That's a 12AX7 dual triode wired as a NOR gate running at 180V on the plate. Feel free to ignore the, um, hot glue and toothpicks filling in for the real mounting hardware.   It's a DC supply so only one of the electrodes in the neon lamp glows.  Bonus schematic. J2 is the USB connector and J1 is 12V power. L1 is a hand-wound coil with 6 turns between 12V and the switch in the LM5001 and another 30 turns between the switch and the diode. If you're wondering which part of this is "tube logic gate" and which part of this is "support equipment to make tube logic gate work with modern computers/power supplies", everything to the right of Q2 in the schematic (V1 and R13-R19) are the actual NOR gate.  Here's a close-up of that hand-wound coil. I'm a little less apologetic for all the hot melt here because ugly as it is, it sure holds the windings in place.  Bonus bonus board layout. 
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Jan 20, 2024 20:03
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I don’t really get it but I do love it
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Jan 20, 2024 21:34
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echinopsis posted:I don’t really get it but I do love it
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Jan 20, 2024 22:02
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Stack Machine posted:Bonus bonus board layout.  this was made using that PCB board wiggleification/hand-drawn-look software you wrote, right? it's a nifty style. this also reminds me that i have a set of nixie tubes sitting on a shelf that i kind of want to make a clock with, but then remember that that would take  and so they stay on the shelf. congrats on getting your tube project actually made
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Jan 20, 2024 23:25
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PDP-1 posted:
Yep. It's more of a png-to-gerber thing though, the hand-drawn style itself comes from, well, drawing the boards by hand in Gimp. I also want to use it to copy other historic styles like the chunky 1.27mm-grid style that was common with early CAD in the 80s and early 90s. I made a big push to make progress on some languishing projects recently though and I'm really happy to see this one work on the first rev. (doubly so since it's hand-drawn and LVS is manual) Stack Machine fucked around with this message at 23:45 on Jan 20, 2024 |
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Jan 20, 2024 23:37
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very neat. also thank you for the reminder I need to replace one of the 12AX7s in my guitar amp
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Jan 21, 2024 04:19
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Genuinely wonder what tube market will look like in the next 10 years. The only place that allows the factories is Russia pretty much, and well we know how that goes. The fab process involves a shitload of vaporized heavy metals so it's basically impossible to spin up a new plant in any country where you can get your mail w/o dudes on motorcycles taking potshots at you. to be honest, sim stuff has gotten enough nuance that i don't care either way, but it'd be cool if we could figure out how to keep the tube train running. i have a big fistful of the neural dsp plugins and they sound grrrrrreat.
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Jan 21, 2024 07:16
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artisanal tubes (not really kidding, small lot handmade)
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Jan 21, 2024 08:52
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china? they would probably make them in like Vietnam too.
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Jan 21, 2024 08:57
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I think the 12AX7s I have now (that aren't american new old stock) are from china and slovakia and they're still produced, but the most recent ones I bought were like $30 a piece.
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Jan 21, 2024 14:55
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eschaton posted:artisanal tubes I remember that somebody did this with nixie tubes around 2010 and I think they were hundreds of dollars a piece. Somebody designed a clock around it that displayed the digits one at a time. edit: guess they're still at it, dalibor farny in czechia.
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Jan 21, 2024 14:58
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Oh poo poo yeah I loved the step by step video of the actual process of how they get made. Fascinating stuff for a huge dork like me.
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Jan 21, 2024 17:05
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maybe they’ll start using those little vacuum florescent tube ics as replacements. i think korg makes one but idk how similar it is to the old tubes.
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Jan 21, 2024 18:16
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PDP-1 posted:this also reminds me that i have a set of nixie tubes sitting on a shelf that i kind of want to make a clock with, but then remember that that would take it occurred to me this morning that i could lower the factor on this thing by a lot if i could ship it off to JLCPCB to do most of the SMT assembly workthey do have smallish STM32 M0 microprocessors with integrated real time clocks in stock, these also have a SPI port that could run a chain of '595 shift registers to drive the digits and then us a FMMT497TA or similar high voltage NPN to drive the nixie pins. iirc, the nixie tubes want to run at 170VDC which is conveniently the peak voltage of our AC mains here in the US so you could pretty much just rectify that AC into a capacitor with a single diode and call the high voltage supply good. i mean obviously you want to fuse it and do some surge protection/filtering but it'd be a pretty basic setup this could be doable? 
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Jan 21, 2024 19:03
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Eeyo posted:maybe they’ll start using those little vacuum florescent tube ics as replacements. i think korg makes one but idk how similar it is to the old tubes. I have a NuTube amp and it's cool as poo poo. imo it sounds very much like a 12ax7 preamp. Plus, it's literally just a single element VFD, so it flickers in time with the music (inverted, actually, so no light when you hit a note)
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Jan 21, 2024 19:25
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