Thread saw too high SWR: >>2939202>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
fresh OC, hot off the press
The UT219DS looks really nice. Should I?
>>2945643at a quick glance, I thought it could measure uA with the clamp lol
>>2945648If you pay 2500 buckeroos for a fluke, you can get a leakage current clamp meter that only measures current up to 50mA or so. While that would be a really nice feature, I mainly want this for measuring inrush current. I have a cheaper clamp meter but it has no min/max mode, just a hold button. The hold button is pretty useless for bench use like I’m using it for. All the other cool features like the dual display aren’t a requirement, but I figure if I can replace the shitty clamp meter and my other meter (dual display Hioki meter) in my toolbox why not.I’m still not entirely sure on buying Uni-T over a less Chinese brand. But Brymen don’t make many clamp meters, and Fluke and Hioki are pricy.
>>2945584has anyone ordered from LCSC in the last month or two? is the quoted poverty shipping and handling service (global direct standard mail) inclusive of tariffs -- or will i somehow be jewed into paying an additional tariff fee by USPS or whoever actually delivers it?
>Just order fully assembled board from JLCJust ten years ago at university, we etched and hand soldered our own boards. Damn.
>>2945790I made an order a month ago, and I wasn’t charged any extra duty, but I’m not a burger so maybe that’s not very useful.
>>2945793i prefer etching my own boards for proof of concept. i don't need qty 5 and i don't want to wait 2 weeks to figure out if i created something that will never actually work. also etching is cool and fun.
retarded question but overhead three phase lines aren't ground referenced, right? there are three conductors and maybe an overhead line that is grounded for lighting protection, but there is no neutral line. so the voltages are all floating with respect to ground and saying e.g., "that's a 69kv line" means the 69kv is with respect to the other phases. so if it's floating, how would i be shocked to death by touching just one of the phases while being ground referenced?
>>2945801I like breaking projects up. Instead of having one board with a lithium ion protection circuit, microcontroller, buttons, and motor driver, I’ll order 5pcs general purpose lithium protection boards and button boards. Then I’ll put the buttons and microcontroller on vero-board, or if it’s SMD I’ll do some etching. Hand-painted etch-resist because I’m autistic.
>>2945833the "ground" is just the difference in potential relative to the phases, so pretty cooked if you were to close that potential with your body
>>2945843just buy off-the-shelf boards. for example in an instrument I'm building (and possibly selling) I'm using an arduino clone mounted upside down rather than even bothering putting footprints for an AVR, USB etc on the main board
>>2945889I use them where applicable, but I often use less common microcontrollers, or want different supporting components, or whatever. Like my lithium charge board, I’m using an alternative to the TP4056 that can instead charge a LiFePO4 if you set the divider up right, and it uses a different DW01 chip for different voltage thresholds, because 2.3-2.5V is too low for a Li-NMC cell.
Ahhh I WILL BECOME A MASTER of making stable, robust LC oscillators for any frequency conceivable AND NOTHING WILL STOP ME NOTHING. I will only use jellybean BJTs (and RF BJTs for higher frequencies)Yes i also struggle with basic algebra but i don't care I don't careI want you guys to help me. Any book, any video series, anything will help
>>2945584if i want to measure the input impedance of a MOSFET amplifier how would i do that? something like a nanoVNA only outputs 500 mV so it wouldn't be enough to drive the MOSFET to fully on.
>>2945936isn't it biased/terminated to give 50 Ohm?
>>2945937i have a MOSFET pre-amplifier that feeds into a MOSFET amplifier. i want to impedance match the pre-amp output and the amp input.
>>2945937>>2945941put another way, i think i want to avoid resistive elements like a 50 ohm termination resistor?
Best thermal glue for heatsinks?
>>2945936Does whether it’s getting turned on or not affect its input impedance? And for turning the MOSFET on, shouldn’t you be using a bias stage to put the MOSFET into the right mode of operation regardless of signal amplitude? Phantom power or otherwise.>>2945953The thermal epoxy made by Tech Ingredients. It’s probably overkill.
>>2945941post schematicalso just buy a monolithic amp IC>>2945953I use picrel. it works well enough for my needs
I want to do a small project with LoRa hardware and meshtastic, nothing fancy, just a proof of concept and to help teach some people about electronics and stuff. I do want to be able to send text messages back and forth between homes a few houses apart, but that's about it.Can anyone recommend the cheapest hardware I could use to do this?
Mmfh, Infineon’s IGC019S06S1 is making me want to swap from silicon FETs to GaN. $3 each at 10x quantity, 1.9mΩ on resistance, 0.5C/W to the big thermal pad on top, rated at 99A continuous or 700A pulsed. Only 13nC total gate charge. Some 25V Si FETs come close, but at 30V and above they’re at least 29nC, let alone 60V
>>2946008you're better off buying some kind of module either from semtech or rak wireless. then it's just 2 spi pins iirc to hook it up to any microcontroller you want.
>>2946008Consider a LilyGo module or whatever they’re called, they’re boards with a LoRa module, ESP32, and often a screen and buttons all together. And you can easily put Meshtastic or whatever on them. But then that’s not a hardware or software project, it’s just a tech demo. So you might want to roll it back by designing a custom PCB for the same firmware, or writing custom firmware for the same hardware, or even both.
>>2946008You don’t need meshtastic to send messages a few homes apart. Or lora, really.Most Lora is artificially limited to ridiculously low aggregate bandwidths, it was designed to send periodic gps coordinates (in the burst).
>>2946024Well, I wanted that sending messages back and forth to be a fun proof of concept for a few other people, and then I wanted to use that as a stepping stone to more complex meshtastic projects. But I want to start small first.
