"second phone or new phone"
Um cryptocoin miners are NOT the same thing as a phone....  Then there is the fact that China does not allow their citizens to buy miners and resell them...

Since you wisely worded the topic as 'blockchain based developer' that implies that you already know that using a blockchain is NOT just limited to cryptocoins. Blockchains are being used to replace conventional databases that are used in a myriad of applications where goods and records need to be securely tracked and that information permanently stored. Examples are in shipping logistics, food production, state and municipal records, etc.

For those applications the current pool of programmers who know how to code for them is very small meaning salaries for talented programmers are huge. BTW: this is the same situation for AI programmers - huge demand but few people who know wtf they are doing.

That said, it means that:
a. you need to learn how to code c++/python/java/etc. If you can wrap your brain around that then you will have a very good start.
b. you need to learn databases - much of what goes into designing a database application applies to blockchain tech as well
c. you need to find universities that have blockchain (and or AI) programs.
d. somewhere in all that you also cover at least a working knowledge of cryptography, 'c' should have the needed courses for it.

It is NOT impossible but it does mean that you need to learn quite a bit. Of course that applies to ANY technical career you want to pursue...

NO, most countries are NOT giving excuses and reasons for banning crypto coins. Only a very very few have banned them with China being the largest one.
BTW, "Btcoin" is not a generic term that covers all crypto coins. It is one specific coin out of hundreds of different ones just the same as a Dollar is not a Peso or a Ruble or Yuan.

Some Some Fun Facts based on that; Using the often quoted 3.6 cents per kWh, taking 1GW offline translates to:
 $36/hour per MWh or $36,000/hour per GWh
 x24hrs @ 1GWh = $864,000 per day
That would be direct 'lost' revenue to the electric provider from mining but of course the power IS being used elsewhere so for ERCOT it's more just a matter of shuffling numbers between inputs in a spreadsheet.

In and of itself $864k per day would also be what the mining companies are spending for power which in-turn tells us that said companies are (were) mining enough coins to pay that AND pay for the infra/miners and still make decent profits....

As pure Speculation I'd think that ERCOT pays the miners perhaps 1/4 to at most maybe 1/2 of their averaged bill for the shutdowns. If so at least that should be good for at least paying off the infra and miner gear debts so the mega-mining companies are certainly not hurting much.

These things are BIG and never ran in enclosed areas.. How big? Well for reference and assuming 100% conversion efficiency 1HP=0.7456999 kw of power so for 250kw you will need at least a 336HP engine. Yes some of the largest can provide several MW of power 24x7x365.

Why would you even think there is fire hazard? I'd be more concerned about clueless amateur wiring between the generator and point of usage...
Here is a nice link on Prime power generators and what they are all about - huge differences between them and the more common standby-power gensets.

Agreed. Several years ago the hosting companies that were in the Portland OR/Seattle WA found that out the hard way. When Alcoa shut down their aluminum foundries in the areas the local (hydro) power companies had massive amounts of power available with no users so they did great deals -- for a while. Once Canada ran lines to connect that power to the Canadian power grid it was a whole 'nother story and because the miner hosting companies had no long-term contracts in place they were forced to leave or at best massively scale back their operations.

That linked article tells us that Core Scientific and Riot both have taken the cutbacks as a planed-for part of their business which is good. Now just how long their contracts are valid before being up for renegotiation is another story. Hopefully they are set for several years...

2 good things about that:
a.Those companies had already planned for the power cutbacks to be part of expected operations. In the past that was very rare to see and most 'business plans' were based on pie-in-the-sky perfect operations with no surprises so when the proverbial butterfly in South America flapped its wings at the wrong time said companies were seriously boned.

b. It will make for some nice seasonal dips in difficulty

The reasoning in the bit about it increasing internal temps is wrong but the increased risk of arcs is 100% correct when you are talking about altitudes over 5000 ft. If you check specs, many time various things like TV's, PSU's and other line powered devices WILL have altitude restrictions. Grant you the 5k limit is very conservative but nonetheless it is fact that as air pressure goes down so does the breakdown voltage which means that greater spacing between PCB traces is required to pass hipot testing. It is not until pressure goes below 0.05mbar (approaching a hard vacuum) that the breakdown voltage of the remaining air starts to rapidly climb again.

Those large farms in Texas were brought online fully expecting the cutbacks and as part of their contracts the farms are partly reimbursed by their electric providers for the lost revenue to encourage the farms cutting back when needed. I've made mention several times in the past about the service agreements they have in place and provisions for them cutting back/temporarily shutting down operations to ensure adequate power for the rest of the states consumers.

Um, when testing diodes and caps you need to remove one end of them from the circuits to fully verify what you see. In the  case of diodes they MUST conduct only in 1 direction and you reported conduction in both. Hopefully just from them still being connected. In the case of caps you are probably good and they are not shorted - at least not at the low voltage the meter provides. If the static tests look good then measure the actual voltage across the caps to be sure they hold up to full voltage.

Well, Kano's nodes (currently 7 of them spread around the globe) run more than that but still - certainly more than most folks run

About Testnet: Remember that it is running at a far lower difficulty so take the results you get with a grain of salt. For one thing with it running the much  lower diff, Testnet does not prove that your code works with the current diff - only monitoring the size of shares being returned from Mainnet can prove that. AFAIK if you eventually start to see some results > around 2/3 of current diff you should be good but others will have to chime in on the exact number. As I recall it has to do with making sure the code properly handles numbers that are over what 32-bit can natively use.

Precisely.
Remember, it is not only just 1 chip inside of any given miner that solves the hash but extends to being just 1-core inside of that chip (and these days it is over 4k cores per chip) that spits out the correct number. IF a miner of yours finds a block then what matters the most is how fast that is transmitted to your pool (solo or otherwise) and it in-turns broadcasts that to the BTC network so other miners can build on it to confirm it.

Ja having a full-up ASIC miner with several hundred chips in it "gives you more rolls of the dice" per-second so to speak but as sledge0001 proved earlier this year, even against the astronomical odds a 1-chip stick miner CAN find a block. In his case it was one of Sidehack's Compac-F sticks that did it.

But as other have said: Sticks are strictly for hobby or 'lottery ticket' use.  Frankly, if you insist on pushing the envelope of those uses, just get an old s9, pull one of its cards and undervolt/underclock it and get damn quiet several THs pulling around 800-900w. Same goes for an Avalon 841 except ya don't have to pull a card.

Phone? Um, hopefully you mean miner....
If you did intend to type 'phone' then boy are you in the wrong Forum....

Heavens forbid you post a few links to what 'you read somewhere'.....
Without examples you are just posting worthless trash and personal speculation.

Define 'very hot'. If you can touch it for a few seconds and not get burned it's fine. Plus even with a fan, the f;s still refer to run at a quite warm temp. Around 125F is ideal.

The other thing is that the f's really prefer using a starting freq of at least 300MHz. Just the nature of the chip used (and most mining chips)

Ya know, there are MANY topics about this in not only in this section but the Hardware area as well. The Forum does not need yet another thread about it.
Perhaps if you spend a little effort reading those threads you will find your answers - and more... 

If you are trying to find out *why* ASIC's are so much faster the simple answer is: Because a CPU/GPU it a general purpose device they spend a lot of clock cycles just moving data around inside their registers as they execute the various math code operations including however many cycles the OS running the PC consumes. Data input and output is just a tiny part of the time being spent.

ASIC's don't do they that, they pipeline the data through hard-coded logic elements. When new work is presented to the chip 1-2 clock cycles are all that is needed to load the work into the pipeline and from there it is 1 cycle to read in new data AND output the result from previous calculation then 1 cycle for process the hash function for a whopping total of only 2 clock cycles needed for each increment of the work presented to the chips. Throw in the fact that even the ancient S1 had 256 cores in each chip and the reason for their speed should be obvious. These days a miner chip will have over 4k cores in it sooo...

If you still are only using the USB connection for supplying power yer gonna have problems as the connectors simply cannot handle enough current to power the chips. The absolute max current rating for USB-A connectors is 3.1A and even that is intended to only be for a short time - not 24x7.

Wrong.
The 'cg' originally stood for CPU GPU but code for using those was removed long long ago by -ck and Kano back when they still collaborated. While cgminer still does support some FPGA's, it has been primarily geared for ASICS for many many years now.

No one here can/should say that it is impossible to find a block using a CPU-based miner.
It *is* however very very very very very very very very very very very very very very very very very very very very very very unlikely.
Even using the CompacF USB ASIC stick miner gives you an at least several-billion x more chance. Probably being the 1st person ever to observe a Proton decay event is more likely (google it...)
But, yes -- it IS possible.

Good choice of fluid, we've used it for over 50 years as a coolant for industrial lasers. The main thing to be aware of is that Diala WILL very quickly cause all rubber and pvc parts to become very hard and brittle - esp the jackets of the cords & cables.

edit: Oh, regarding pumping Diala and similar oils...
As mentioned earlier the fluids attack most normally flexible materials. If your pump has shaft seals they WILL harden and along with that Diala has near-zero lubrication properties so the seals will wear faster. Put those together and the pump will start to leak in 2-3 years. You need to use a magnetic-coupled pump that has no shaft seals: The pump housing is sealed and spinning magnets on the motor shaft couple to ones inside the pump housing to drive the impeller.

Plus Diala is engineered to penetrate into materials and move through very very thin gaps. That means you need make sure all plumbing connections are well sealed using a paste-type of plumbing sealant or they will start to drip... Using Teflon tape just does not reliably work.