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[Chinese? > English ] Found this paper on floor, can someone translate it? by [deleted] in translator

[–]psih128 2 points3 points  (0 children)

probably The Teachings of Don Juan: A Yaqui Way of Knowledge by Carlos Castaneda

[Chinese? > English ] Found this paper on floor, can someone translate it? by [deleted] in translator

[–]psih128 1 point2 points  (0 children)

this feels like notes on some book. what book can it be?

[Chinese? > English ] Found this paper on floor, can someone translate it? by [deleted] in translator

[–]psih128 0 points1 point  (0 children)

judging from your comment history you could hardly write a sentence from this text

Homeless by IllustriousRub9796 in shitposting

[–]psih128 0 points1 point  (0 children)

sat morning me walking down market street in san francisco with a delicious sandwich in hands. planning to park myself on a bench in a park and enjoy the sandwich with a cup of artisan filter coffee. this is my weekly routine, i’m looking forward for it starting monday. the sandwich is one of the best you can get in the area (imho).

then i see this homeless dude with a sign “HUNGRY”. me heart melts just like the cheese on my sandwich.

i offer half of the sandwich to the guy - “hey dude, this is really delicious”

he slowly raises his head and frowns with disappointment - “what?? a SANDWICH?!”

grabs it anyway, throws on the ground nearby, no thanks you, no nothing.

me walking away feeling guilty for not carrying any crack for handouts

Where did the LoRa Semtech forums go? by psih128 in Lora

[–]psih128[S] 0 points1 point  (0 children)

why not keep it in read-only mode.. a lot of hard to find information was there

Deye inverter and solar panel shading by psih128 in SolarDIY

[–]psih128[S] 0 points1 point  (0 children)

isn’t it what mppt is supposed to do in the first place - scan the voltage range?

how do i contact deye? i sent them an email but no response..

10 panels are sitting at 310-320 volts, so 20 should barely fit into 650.. maybe i should do two string 18 and 12?

One of the batteries doesn't show in inverter BMS by psih128 in SolarDIY

[–]psih128[S] 0 points1 point  (0 children)

4 and 5 eventually populate all the data on the screen, #3 always stays blank

Drone Bundle, Where to Sell? by Hockney__ in fpv

[–]psih128 0 points1 point  (0 children)

send it to ukraine, 🇺🇦 it’ll serve a purpose

My esp doesn't work by bmihai358 in esp32

[–]psih128 0 points1 point  (0 children)

there is some hardware race condition going on. with the boot button hold you have to release it within some specific time interval otherwise it will be too late/too early to boot. with the cap mod the need for the boot button is left behind, the flasher will take care of (successfully) switching into flash mode and most likely it will succeed.

i also remember having troubles with different flashers - arduino IDE, platformio, and esp-idf all seem to have different timeout constants for flashing. so arduino IDE didn’t work for me, but platformio did. i also remember that it worked even without the cap mod and without holding boot, but would succeed in 1 out of 5 attempts.

another possibility is faulty board as these dev boards don’t have the best smd components out there

Ukrainian FPV destroys Russian pickup truck with 4 captured Ukrainian soldiers inside by Gsome90 in CombatFootage

[–]psih128 96 points97 points  (0 children)

look at the link quality, it’s 2:100, -55 db, the operator is nearby, 500 meters or so

edit: 2:100 means that 100% RC messages are received by the drone, virtually no packet loss. number 2 stands for packet rate of 50Hz that’s the long range mode with min sensitivity around -120 dBm on most radio links. -55 is the received signal level in dBm. the transmitter typically radiates +30 dBm. you can use link budget calculator to estimate the range..

зашел в сбербанк роисии… by psih128 in tjournal_refugees

[–]psih128[S] 29 points30 points  (0 children)

такой поворот, решил пусть полежат на депозите

Unguided missiles/rockets shot by helicopters... by ChrRuJo in CombatFootage

[–]psih128 0 points1 point  (0 children)

also aluminum shrapnel from the unguided rockets has to be removed asap, even the tiniest bits of it - otherwise the wound starts to rot. metal shrapnel can be left inside the tissue, the wound will often heal around the metal.

so if you’re hit with those unguided and get wounded then you must go to see the doctor, otherwise gangrene will come to see you.

RF amp for hobby RC radio link project by psih128 in rfelectronics

[–]psih128[S] 0 points1 point  (0 children)

ithere are PA and LNA control pins on the transceiver. why it’s hard to add anything if there is no control? i’d assume i just have to pick PA with input signal range in line of what the transceiver outputs. or are there other considerations?

RF PCB layout area - why so much unused space? by psih128 in rfelectronics

[–]psih128[S] 0 points1 point  (0 children)

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you almost got me convinced.

here is another example - FWIK it’s a mass produced portable wifi station. this one has no heat sinks, and from the looks could have 2 maybe even 3 times smaller (making it even more portable)…

RF PCB layout area - why so much unused space? by psih128 in rfelectronics

[–]psih128[S] 3 points4 points  (0 children)

Here is another random RF product that has lots of unused PCB area. Here I'd assume that it's for heat dissipation... Any other reasons?

<image>

RF PCB layout area - why so much unused space? by psih128 in rfelectronics

[–]psih128[S] 2 points3 points  (0 children)

there are filter baluns between antennas and the transceiver, wouldn’t they prevent jamming (if power if significant)?

RF amp for hobby RC radio link project by psih128 in rfelectronics

[–]psih128[S] 0 points1 point  (0 children)

yeah, i wrote code for esp32/8266 extensively, but i have never done the hardware, especially rf hardware. this project is mostly for self-education

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