Thread tombstoned: >>2883138>I'm new to electronics. Where to get started?It is an art/science of applying principles to requirements.Find problem, learn principles, design and verify solution, build, test, post results, repeat.Read the datasheet.>OP source:https://github.com/74HC14/ohmOPbake at page 10, post in old thread>Comprehensive list of electronics resources:https://github.com/kitspace/awesome-electronics>Project ideas:https://hackaday.iohttps://instructables.com/tag/type-id/category-technology/https://adafruit.comhttps://makezine.com/category/electronics/>Books:https://libgen.is/>Principles (by increasing skill level):Mims III, Getting Started in ElectronicsGeier, How to Diagnose & Fix Everything ElectronicKybett & Boysen, All New Electronics Self-Teaching GuideScherz & Monk, Practical Electronics for InventorsHorowitz and Hill, The Art of Electronics>Recommended software tools:KiCAD 6+CircuitmakerLogisim Evolution>Recommended Components/equipment:OctopartLCSCeBay/AliExpress sellers, for component assortments/sample kits (caveat emptor)Local independent electronics distributorsladyada.net/library/procure/hobbyist.html>Most relevant YouTube channels:EEVblogW2AEWMoritz Klein>microcontroller specific problems?>>>/diy/mcg>I have junk, what do?Shitcan it>consumer product support or PC building?>>>/g/>household/premises wiring?More rules-driven than engineering, try /qtddtot/ or sparky general first>antigravity and/or overunity?Go away
Have any anons been successful in making their own CB radio transmitters and receivers? I want to build on a breadboard a tunable CB transmitter and reciever for the 26-28MHz range but have run out of documentation on how to properly form the signals. Im looking for books and circuit diagrams on this, hoping to create a competent 2W transmitter and good quality receiver. If anyone has any resources they can share or personal experience, i would love to know more>What components have you used for your oscillators to fine tune channel selection? Any preferred trimmers or components? >Any suggestions for breadboarding an oscillator that can create a clean sine for any of the channels present? >Any frequencies to avoid near this range?
Does anyone know if anything in my random Chinese grab-bag of transistors can do the same job as the 2N3904's, which I am running out of?I don't even know how I'm supposed keep track of and catalogue all of my components, it's a nightmare
>>2891508I think it’s just generally AM (amplitude modulation) however, I think Cobra lobbied to make FM a thing.The receiver is as good as the filter.You might want to ask on /diy/ham/
>>2891513> chinese grab bag of transistorsAll the NPNs are probably all the same transistor, just re-labelled.You can test their characteristics with a DMM and some simple circuits that are in various old datasheets.You might need to destructively test some to determine the max I/Vce and max power dissipation.Fun project!I wish I had a random grab-bag of chinese transistors I could use for building life-critical medical devices.
>>2891513most of the NPN transistors in that bag should be ok to use in place of the 2n3904, depending on what you are doing. The 2n2222 has a similar frequency response but has higher gain, for example. You can feed more current into the base, but it might as a result have a higher voltage drop. As for the issue of organization, get one of those organizers for ICs and maybe a few cheap plastic box orgainzers for 8 bucks. Get a label maker or sharpie on tape and go to town.
>>2891508>>Any frequencies to avoid near this range?Everything below 26.965 MHz and anything above 27.405 MHz.
How difficult/expensive would it be to get this old tv working enough to be converted to a music oscilloscope?
>>2891649
>>2891649The set has been gutted. Find something you can repair or simulate one with laser galvos & mirrors.
>>2891656alright, guess I'll turn it into a fishtank
>>2891659>fish tankIt would be more fun and rewarding than trying to put Humpty together again. Bonus points for optical magnification of little fish.
>>2891661>>2891661>optical magnification of little fish.now there's an idea. Maybe also tropical fish and a black light.Maybe I could replace the speakers and hook it up to my stereo an create a kind of bio-oscilloscope
>>2891666checked
>>2891649> oscilloscopeSo, that’s probably a “raster” crt tube.You probably want a “vector” tube like asteroids had. Technically, you could make the yoke magnets (that you will have to make yourself) do vectors with the electron gun, but I don’t think it’s going to be ideal.
>>2891649its missing the things>>2891746my understanding was that you deflected the beam with a sawtooth wave for the horizontal and a stair-step kinda wave for the vertical. i dont immediately see why you couldnt just throw whatever wave you wanted to in there.
>>2891749>>2891746Perhaps I could pay you to do it? Do you live in Melbourne?I have the orange thing
>>2891752>Do you live in Melbourne?what a weird question to ask a stranger on 4chan. what are the odds i live in the exact city as you? theres a lot of cities bro.at any rate, do you know if the tv actually works? can you get it to turn on and light up the screen? because if not then its unlikely youre gonna be able to turn it into anything. but if it works then it shouldnt be too hard.
>>2891754It’s a fact a disproportionate amount of Australians post on this site. So it was worth asking. Never know your luck, aye cobber?>can you get it to turn on and light up the screen? because if not then its unlikely youre gonna be able to turn it into anythingWhat a weird question to ask. It’s kissing a plug but even I know that is easy to replace. You’re not exactly selling your expertise.
>>2891756well, cunt, like the other anon said its fuckin gutted, but after you revealed you had the deflection yoke i thought maybe YOU were the one that gutted it and you had access to all the guts.also, upon reading the wikipedia page for deflection yokes, apparently they were dual-purposed in those sets in order to create the e-beam voltage. neat! but sucks for you because now you have to make 10,000 volts yourself. if you dont really have any experience in electronics this is probably out of your wheel house.
Oh, I also have this (top right)
>>2891757It’s fine, I’ll make an ornament and hang it on my wall/fridge
>>2891758Wrong polarity.
>>2891749>>2891752> I have the orange thingSo those are the magnetic deflection windings.You need to get the specs on the tube and give it a filament/heater current, and like maybe 20 kV or more for the anode voltage, the cathode voltage (where your electron gun “on” and “off” come from) and possibly like 8 kV for the focus grid, etc.Then apply some current through the magnet wire and the dot on the phosphor will move around.Warning: start with lower voltages, and don’t let the dot be so bright as to burn the phosphor: keep it low intensity unless it’s moving around rapidly.
>>2891763I feel like you’re over sharing and it’s become a little awkward. Forget it bro, it’s an ornament. Ima grow flowers out the top.
>>2891441most smps use pic related. tl431 maximum anode-cathode voltage is ~36v. what is the recommended way to use a tl431 when you have e.g. a 48v output voltage? ive seen some people say a zener diode but would this fuck up the transient response, due to things like zener capacitance? what is the "industry standard" approach to this?
Is something like this good for extracting flux fumes while soldering? Has granular carbon filter. 173 cfm fan.
>>2891782I doubt zener diodes are any slower than a TL431 is. You could either use a zener in parallel with the TL431, or a zener in series with its supply.
>>2891784> flux fumesRegular flux comes from pine tree sap.Imagine going camping, everyone is sitting around cooking their s’mores and whatnot around the campfire, and there’s this one guy in a hazmat suit.That guy is you.
>>2891832lel. You're funny
>>2891832pls don't kill me
>>2891832It's activated flux, so it's got some artificial acids or whatever chucked in there. Also you don't have unventilated campfires indoors.
>>2891832Fair, but still, feels like I should have something at least. Are those basic extractor fans good enough if I have a window open.
>>2891888>you don't have unventilated campfires indoorscoward
>>2891649>get this old tv working enough to be converted to a music oscilloscope?i did that like 20 years agoit's interesting to play with for about 5 minutesand then you scrap it coz it's not very impressivei suspect that if you used a tiny 5-inch screen from a portable TV, or better yet, a green phosphor 7-inch from an old Osborne computer, it might be cute enough to keep on a shelfgreat thing about that Osborne screen, which i have, is that it just needs 12Vdc @1A -- all the HV stuff is hidden inside the metal caseif you were pull the screen from a dead scope, you'd have to pull the scary HV supply as well
>>2891888When i soldered stuff I didn’t smell like flux for 3 days like I did sitting next to a camp-fire.I used to smoke heavily, now I just vape a lot, but I need a ventilator for a tiny wisp of flux smoke.I also take the packed transit every morning and don’t wear a mask (it restricts my breathing), I find inhaling everybody’s aerosoled sneezes with chicken pox, hiv, sars, flu and cold viruses invigorate me. But a wisp of pine smoke, 100 times less than a match head gives off… that shit will kill you.I also burn a lot of candles for my ceremonies (with the goats) and the incense is burning non-stop to mask the smell of my favorite—curry.Gotta go… wildfire evacuation order just came in.Kek u later frens.
>>2891935Turning an Osborne into a scope would be a huge waste, there are far cheaper and less significant sources for a CRT
>>2891949>Turning an Osborne into a scope would be a huge wastenot a dead one thrown away 2 decades ago, leaving only the screen behind
why can't these fucking kicad niggers just add support for multiple pcbs in one project?>j-just do multiple projectsi want to see multiple pcbs on one 3d render so i can visually confirm tolerances, pin ordering, etc.
it really annoys me that theres almost zero rotary encoders with a built in button that run at 3.3V, almost all of them are either 5V or 40+ bucks
>>2892064i don't understand. if you're referring to pic related, they're basically passive devices and will work at any voltage.
>>2892074it dosent mention anything about it on any datasheet or manufacturer website i look at but i can try to fiddle with one and see if it works on 3.3v then, thanks
How can I find info about this component? Simple google search didn't yield results...Okay so I forgot about submitting this comment, and did some more searching, I don't even have everything noted what I found, most recent was >APX809S/810Sand in the data sheet I found matching ID code of "RV">APX810S05-29SA-7and the -29SA fix means 2.9v which would make sense as a cutoff voltage (assuming) for 3.7v lithium battery for disposable vapes. >https://www(DOT)mouser.com/ProductDetail/Diodes-Incorporated/APX810S05-29SA-7But the Identification markings don't really match up, but it's close.
>>2892064>>2892087Those are just a pair of switches on cams. If you were wanting to put 50V though them I can see the point of asking such a question, but you’re not. They’d probably work over 24V and they’d definitely work down to below 0.1V.So A: people use those all the time with ESP32s and Raspberry Pis and other 3.3V devices.B: there is no conceivable mechanism for why a mechanical switch would fail to operate on very low voltages and currents, at least until you get down to the level of thermal voltages.If you understand the mechanisms behind the components you are using, then you will better be able to use those components in ways other than what is explicitly written.>>2892108If it’s a Chinese knockoff chip, it could well have different markings despite being identical in other ways. I’d browse LCSC to see if other companies have made knockoffs of that chip, and check their datasheet to see if the markings and logo match. The prefix may differ (e.g. GD32F103 instead of STM32F103). But the Chinese do make a lot of unique lithium ion ICs, and also LCSC’s site search is pretty bad.From circuit context, what is the IC doing? Is it acting as a voltage regulator or reference? Or a comparator to tell the thing to shut off once it’s low on charge?
>>2892109well on the other side of the USB-c Is another capacitor (my multimeter cant test capacitance) then V+ and V- to the battery. The pic now doesn't have any additional components besides whats pictured. when I was on https://smd.yooneed.one/ I checked for R, RV, V, 0, 02, 2, 2A and if I found SOT-23 I would look at the info and usually came back being using with 20V+ applications it seemed.I am not sure on what its doing IC wise, this is something I found with other random electronic stuff. I am new to this kind of stuff and usually lose motivation if I can't make progress.After some continuity it seems 5k resistors are connected to A5, B5 (CC1, CC2) on usb-c and the other end is connected to ground.
>buy local USB-to-RS232 adapter>actually is compliant with RS232, using +/-7V signallingit only cost ten times as much
