Going to guess the tiny little capacitor that was supposed to generate the top N channel drive voltage shorted out, likely the little ceramic in the top row that turned to powder. The small desoldered chips likely are the drivers, and they commoned all the top drive connections to save on 2 capacitors, so when it shorted out all the top N channel parts were running linear, and went flambe, and then the top shorted out on one or more phases, and DC cooked the motor, just about the same time the ESC was also doing full flame generation. Stopped when the traces melted through and acted as a fuse.
@EEVblog
2 жыл бұрын
Plausible.
@MattOGormanSmith
2 жыл бұрын
Yep, I'm guessing it used N channel for the top end too for the lower R_on. This complicates the gate biasing. Another possibility is the motor housing was connected to BATT- for "grounding" or EMI and it shorted to a coil. This would also pop the high end TX and the coil AFAICS. Edit: I couldn't find a datasheet for the MX2103 but the IR2103 does use N channel for the top end and generates the gate voltage internally, which implies a fault would only blow one phase.
@russellhltn1396
2 жыл бұрын
I'm wondering what protection there is against software malfunction. Is it possible for the system to lockup and apply full power to one phase or try to rotate way too slow?
@shurmurray
2 жыл бұрын
I think it is possible to shorten the explanation. Every motor phase connects to 2 mosfets: one going to battery positive, the other to the battery negative. In normal operation they NEVER EVER opened at the same time. Any water on a PCB provides power to the gates and opens transistors. Guess what happened when they both connected to the power? The motor probably got between two permanently opened mosfets (let's say in phase A top mosfet was permanently opened by the water on gate and ground mosfet permanently opened on phase B) and joined the magic smoke party. Oh... My explanation turned out to be not much shorter =)
@preddy09
2 жыл бұрын
My guess is the heat spreader(not a heatsink) was not properly contacting the top n mosfets, making the resistance go up for the same current. Came to this feeling because it looks like a more gradual heat failure since two phases and atleast 2/3 top nmos chips failed almost equally, ruling out capacitor or other component failure. Looks like an ideal failure actually where the motor and esc were put to good use without one being overengineered over the other.
@derekloudon8731
2 жыл бұрын
Reminds me of a story that my brother told me many years ago. He used to live in a "dodgy" part of London and one of his neighbours brought home a large magnet (I don't have any further details) which he slapped onto the front of his electricity meter hoping it would stop the wheel turning. It didn't have the desired effect but what it did do was pull off all the little display pointers, which ended up in a pile at the bottom of the meter. Try explaining that to the electricity board engineer "they just fell off guv". 😆
@jwflame
2 жыл бұрын
The ferrite rod antenna can be positioned 2 ways in the plastic moulding to allow for selection of the best reception position when it's installed. The IR port is for configuration before it's installed, setting which group of commands it responds to. Not something that would be used in the field.
@ambassadorkees
2 жыл бұрын
Props to Elimo for using the standing USB-C connector, doubling as a support stand for the whole tree.
@martinda7446
2 жыл бұрын
Imagine seeing those FET specs when we were spotty youts! 1.9mOhm and 180A in a package 5mm square. Still mind boggling to me. These kids today don't know how good they have it. I used to have to lick the road clean...etc...
@digitalradiohacker
2 жыл бұрын
Lick the road?!? My dad told me a story about when he was a kid, and he went to the first Maplin store in Southend on Sea on his bicycle. He lived in Doncaster. That's a little over 200 miles - One way.
@martinda7446
2 жыл бұрын
@@digitalradiohacker Ha ha wonderful.
@firstmkb
2 жыл бұрын
Oh, you had a road! We used to get a lump of cold poison for breakfast…
@digitalradiohacker
2 жыл бұрын
@@firstmkb Breakfast?!?
@stevengwilliam8096
2 жыл бұрын
A bit more background with the LF receiver. The phase modulated signal is transmitted from Droitwich (500kW), Westerglen (30kW) and Burghead (30kW). The Droitwich transmitter is in the Midlands, the latter 2 in Scotland to overcome all the granite in the highlands. All 3 sites are frequency standards and so use GNSS Disciplined Rb oscillators to hold the 198kHz stable. The phase modulated signal is plus/minus 22.5 degrees Manchester coded. As the service is a frequency standard, you can't have a "bunch of one's" in the data advancing your phase. So a '1' in the phase mod advances the phase by 22.5 degrees then retards it 22.5 degrees. A '0' in the data does the opposite to the net result is no phase change on the carrier. The data rate is 25 bits per second and a complete data frame takes 2 seconds making a data block. 30 data blocks a minute. The data block beginning at 58 seconds is the time code block for the next minute. And there is todays short lesson on LF Phase modulation.
@AirzonesBlasters
2 жыл бұрын
I make my own esc's. Never blown a motor, but am all too familiar with the smell of esc smoke :) They are pretty good though and the motors do take a hell of a beating. There's rarely any overcurrent protection, so if anything does go wrong, it's all over. The top mosfets will be the exact same as the bottom. The 3 top side chips are the gate drivers, and it was probably just heat through the board that desoldered them. If I had to guess, one of the fets failing closed. The ESC can't detect that and would happily turn on the opposite side of the half bridge. And then the internal power traces all blew apart - which is why the pcb is splintered near the battery connector. It's pretty rare since the fets normally fail open. Another thing that can happen is the mosfets are running too hot, and they desolder themselves in operation and pivot and cause all sorts of chaos. Not sure how the heatsink would impact that - but it doesn't take much of a misalignment for those small fets to bridge the drain and source when rotated.. I did have one fet rotate 90 degrees on an early board of mine.
@ddegn
2 жыл бұрын
It looks like the heat sink had heat shrink tubing over it. The whole ESC looked like it was also covered with multiple layers of plastic. It's kind of hard for FETs to be cooled down when the air flow is blocked this way. It's crazy how often heat sinks get entombed in plastic with these ESCs.
@mikeselectricstuff
2 жыл бұрын
Re. the teleswitch, 198khz should penetrate pretty much anywhere, but nowadays I suspect interference from myriad SMPSUs, LED lights etc. could be a problem. I wonder how secure these are from locally overriding the signal - probably doable mostly in software on a Raspi or similar.
@simontay4851
2 жыл бұрын
But why woud anyone want to turn it on during the day when electric is more expensive.
@mikeselectricstuff
2 жыл бұрын
@@simontay4851 There are typically 2 meters, one for each rate. If you can turn on the cheap rate supply out of hours, you get the cheap rate whenever you want
@Palmit_
2 жыл бұрын
i edited my question. but what does your reply to me represent? am now more confused. lol
@Palmit_
2 жыл бұрын
@@simontay4851 in the Uk there is a 'roughly' standardised On-peak and off-peak supply time. on-peak is when everyone gets home from work til about bedtime and when everyone wakes up before going to work. Off peak is when most are asleep at night. So to 'help' energy supply companies consotred together and introuduced "Economy 7" basically two supplies. Economy 7 would charge electric storage heaters (brick heaters) , immersion wter heaters and the like at the cheaper rate overnight because demand would be less on the grid and therefore not premium rate. This meant a second supply 'metering' method was required. But with only one physical supply meter. hence the relay that switches and essentially operates the meter in one or the other mode. :)
@Palmit_
2 жыл бұрын
@UCuXQELzwyXMzinJaxplkERA i edited my question. but what does your reply to me represent? am now more confused. lol
@Lucky32Luke
2 жыл бұрын
The most common cause with first time builders is installing their motors to a carbon-fibre frame (which is conductive) and using too long screws which can reach the stator in the motor and short out taking the ESC with it. It happened to me too at the beginning of getting into this great hobby flying FPV quadcopters, now I have 22 of them on my wall from 18gram up to 900gram and only a few ESC have failed in seven years. When the motor and ESC happens the same time I almost sure it was started on the motor side. Only judging here by the soldering job the guy who sent it was only started this hobby recently. I may be wrong, I apologise if I was.
@ulwur
2 жыл бұрын
I was just about to write the exact same thing. Sorted the top mosfets through the motor to the carbon fibre.
@djmips
2 жыл бұрын
Can't you put in some fuses to prevent the ESC and coils from melting down?
@Lucky32Luke
2 жыл бұрын
@@djmips I'm afraid if you short the motor's stator with a screw the motor will be toast but maybe you can save the ESC with a fuse but these motors are very current hungry (a 5'' motor under load can get up to 35A peaks) so it needs to be a very beefy fuse but still able to pop before the ESC takes the hit. Some ESC has onboard short safety circuit but they cost significantly more. In general we build our quads to carry only the minimum weight needed so we gain more flight time and agility. All in all it wouldn't be impossible to do but comes with a price - as does everything. I hope it was helpful. ;)
@Electrowave
2 жыл бұрын
A tip on blanking UK postal addresses, you should hide the postcode as well because some postcodes only have one property which would be the same as giving away the address.
@chrisdoherty2199
2 жыл бұрын
Similar thing in Ireland but all postcodes(EIRCODE) identify a single building
@keithminchin1817
2 жыл бұрын
Dave it’s pretty common to use N-channel on top & bottom of the bridge. Newer drivers like the TMC6200 incorporate a charge pump to provide the high gate voltage required. Simpler gate driver’s such as the old IR2101 etc used a boot strap topology which could become a problem at near 100% duty cycle and at low frequencies to refresh the bootstrap capacitor. I’ve found that many gate driver IC’s are particularly prone to negative transients and data sheets stress maximum values. When the gate driver IC fails, it’s just about always the bootstrap/ high side driver that fails and tends to latch on while the low stage of the driver keeps working just fine. Well that’s my experience with 3phase bridges and I’ve let plenty of smoke out trying to get these things working reliably. Cheers to the smoke 🍻
@PaulSteMarie
2 жыл бұрын
The motor windings are probably continuous from side to side, with the opposite poles in series, hence the paired damaged poles. It looks like the motor managed to rotate about 120° from when things started going south until total destruction.
@kellyherald1390
2 жыл бұрын
I don't think you need to worry about all of the electrons falling out. It seems that they were removed with extreme prejudice.
@JuanJose-tn8yd
2 жыл бұрын
24:00 Funny to see how the relay is shielded in such an old device but almost nobody takes it into account in modern electronic locks with the relays exposed outside the house.
@arthurmoore9488
2 жыл бұрын
Take a look at lockpickinglawyer. He has plenty of videos defeating that type of lock in seconds. The scary thing is some shotgun racks in police cars are also vulnerable to magnets! Meanwhile, this is the electric company, and someone defeating this could cost them quite a bit of money. So, they're going to spend the extra few bucks to stop it.
@zmonchamp
2 жыл бұрын
I love the classic mailbag, hell it's why I became a Patron years ago. I was a bit saddened by the halfsies run time to be honest. :-(
@oldguy9051
2 жыл бұрын
About the short runtime: Dave needs to leave some of the mailbag items on the shelve for the next three months... ;-)
@zmonchamp
2 жыл бұрын
@@oldguy9051 haha I was wondering if maybe he's running short of cheap Chinese DMMs on the shelf... 🤣
@EEVblog
2 жыл бұрын
@@zmonchamp I have two more Kaiweets meters...
@zmonchamp
2 жыл бұрын
@@EEVblog how sucks on the salve will that be? Thanks for the reply btw! Maybe it would make a good shoot out video of their 'product range'.
@goldcrownkingmod
2 жыл бұрын
@@EEVblog I loved the old school long length mailbags as well and always looked forward to them and watched them within seconds of them releasing. I’d become a patron just to watch them again. And I don’t know why but I find this format a little more pleasing? It’s just nostalgic even though it’s difficult for you to do.
@tonyollier7098
2 жыл бұрын
Looks like they might have used the standing USB socket on the Christmas tree, so the cable would be clear at the back when using the stand which fits into the 2 slots at bottom, for using it on your window sill or desk etc. It will only be tiny and probably still in the packaging!
@techman2471
2 жыл бұрын
Love the classic mailbag style. Some of my favorite videos are mailbags.
@rabidpb
2 жыл бұрын
Not only is 198kHz good at penetrating buildings etc., it also comes from a 500kW transmitter right in the middle of the country. We used to get perfect BBC R4 reception on LW, in the basement, in Brussels when we were living there (which was handy when they'd broadcast the cricket on the LW station while the FM frequencies carried the usual dull Radio 4 schedule.)
@ianmiles5885
2 жыл бұрын
I live in a tiny hamlet in the UK and the only energy supply is electricity. My house is heated by storage heaters which are switched on and off by a Radio Teleswitch very similar to the one shown, so it was very interesting to see your tear down. The cheap rate times can in theory be altered at will by the supplier via the 198kHz signals to adjust for different seasons or whatever. In my case, the storage heaters charge up several times a day and you can hear a loud clunk each time the switch operates. The teleswitch also tells the meter when it is on so that it can record how much low rate power is used. All of the electricity used in the rest of the house during the on periods will also be charged at the low rate but the storage heaters will never charge up during peak rate periods.
@viperwizard491
2 жыл бұрын
kaiweets multimeter display is regular LCD with color sticker under glass
@terry6131
2 жыл бұрын
At my old house we had economy 7 on a 'wire' fuse board (no RCDs). At change over there was always a bang loud enough to hear throughout the house as it switched to cheap rate.
@ahaveland
2 жыл бұрын
Nice! I suspect the motor overheated, and the lacquer on the windings burnt and then shorted, and presented the top fets with a short. I burnt out a similar but bigger 400kv motor when I tried to use it to drive a bike! Took it apart, photographed it and unwound the coils, counted the turns and direction, bought some more magnet wire of about the same gauge and was able to rewind the motor and restore as good as new! Took a good few hours, but the sense of achievement made it worthwhile. So, it is possible to repair BLDCs yourself.
@Pryside
2 жыл бұрын
I've destroyed many escs over the years and one common reason why they die is usually due to voltage spikes. Especially these cheap quadcopter escs only use a simple ST32F1 microcontroller to control the mosfets and they make a lot of "mistakes" dont switch fast enough or miscalculate the rotor position, this combined with the high rpm and high back-emf causes voltage spikes. If the input capacitors are not big enough and there is no overvoltage protection like a tvs diode on the input, these voltage spikes are too high for the mosfets to handle which exceeds their rated Drain-Source Voltage. Thats really often why they die, bigger Caps with lower ESR combined with a TVS can prevent this.
@mrlazda
2 жыл бұрын
You know how to protect from induction spike? You use flyback diode,. You know what is in every mosfet? Body diode and esc have mosfet in bridge configuration so by design they have flyback diodes, so back EMF on mosfets are limited to battery voltage + body diode voltage drop so there is little chance that voltage spike is high enough to damage mosfet. Here is case that motor was shorted and that burned mosfets (or motor was mehanicly locked or controller messed something).
@Pryside
2 жыл бұрын
@@mrlazda yesno, in that case these diodes also act as a rectifier and put any voltage created between two of the phase cables directly onto the battery voltage side. That leads to the mosfet driver getting way to high of a a voltage and getting destroyed, thus often shorting out the mosfets and destroying them to. But even regarding voltage spikes only looking onto the mosfet side, the diodes in a mosfet actually helps to destroy a mosfet since when you apply a way to high voltage across two phase wires while all mosfets are open, the diodes places the high voltage across the Drain to Source of the next mosfet.
@mrlazda
2 жыл бұрын
@@Pryside so all people who use flyback diode are wrong, and that is basically standard way of doing that. You should publish your conclusions so all people learn that they was doing thay wrong all this time. But I didn't notice that anyone had problems you describe till now but you never know (and that is used so many times in so many designs)
@jackevans2386
2 жыл бұрын
Re the ESC PCB: The high side mosfets will be N Channel as well, using charge pump gate drive, supplied by the 3 mosfet driver chips on the other side of the board. Standard practice these days to use all N channel, due to lower RDS of N channel devices.
@brumbymg
2 жыл бұрын
Mailbag - My opinion: shorter videos, just a bit more frequent.
@rawfpv1207
2 жыл бұрын
usually get thes when the drone is upside down and we use turtle mode to flip it back the right way, by reversing the motor direction, it happens when the motor cant spin due to being stuck in the mud and efforts are kept made to right the drone, burning the enamal couting on the motor windings.
@gamingwithlacks
2 жыл бұрын
Lol you know what might be a funny crossover? You do the hands and opening, Big Clive does the talking. 🤣🤣
@NoLandMandi
2 жыл бұрын
it's a good thing! (the format!) ;). you just decode and reveal the mystery behind one of those old and persistent online ads for me! they use to show the closeup picture of around magnet in someone's hands with a large title, something like "your power company doesn't want you to know this simple trick..." now I know what :))
@andyjdhurley
2 жыл бұрын
That's 'Dun-mow' as in finished cutting the lawn! My nearest town.
@dhpbear2
2 жыл бұрын
Knowing how the mail has been, I'm surprised you didn't receive that Christmas one recently! ;)
@elderbenass
2 жыл бұрын
I can't think of having a 'one code fits all' teleswitch here in Brazil, even back in the 80s. One week after energy company rolling out such, dudes would sell a magic black box to cheat the AM receiver in the broad daylight.
@Z-Ack
2 жыл бұрын
They make really good gifts to your 8yr old kids who are interested in electronics.. then again when i was young, my first meter was a fluke clamp on .. and that thing was used into my apprenticeship 15 years later. I remember shoving those probes into a wall socket and my mom shitting a brick.. lol
@Jergling
2 жыл бұрын
These drone motors come and go from the market so fast, that if you burn one you often have to buy a whole new set. A major pain if you build octocopters. I have re-wound a few of my "vintage" stators just to save from having to do that. There are tons of different winding patterns, the one you see here is AaBbCc-Wye, which is why those two pairs of coils weren't burnt - that's a single phase that was probably at its zero point when the short occurred.
@AndrewFremantle
2 жыл бұрын
I've never heard of IBM Magic Smoke - the joke as I know it is Lucas Electrics Replacement Wiring Harness smoke, playing on the electrical unreliability of British automobiles!
@michaelmoore7975
2 жыл бұрын
The value of the Kaiweets quadrupled when you put the batteries in.
@ekaa.3189
2 жыл бұрын
That's a 8K byte ROM 256 byte RAM based microcontroller. Programmed at the factory to user's spec in very large numbers. No reprogramming.
@thomasives7560
2 жыл бұрын
Love the mailbag, especially when they're under an hour. Cheers!
@n2n8sda
2 жыл бұрын
Awesome old-school mailbag. I believe the UK off-peak "economy 7" is still in use in some places with the radio signal. It used to be common for people who had storage heaters rather than gas / oil fired central heating. Alongside a dual reading meter. You could probably switch the thing these days easy with modern tech but I bet most of the electrical meters have been upgraded to anti-tamper type things. Perhaps some back-emf with that speed controller could be an issue too
@pnjunction5689
2 жыл бұрын
Good format...not too polished, not too long. I like it.
@fishman241
2 жыл бұрын
Regarding quad ESC's they have been getting better. I've built about 8 quads lately, only 1 head DOA ESC's and the others are trucking. Even after crashing into wet grass enough to dead short...something. It came back after drying out.
@firstmkb
2 жыл бұрын
That ESC should be proudly displayed on a Wall Flame!
@michaelfaraday4243
2 жыл бұрын
At 8:07, the reason for the symmetry is because of the tri-spaced arms is one channel. If you look back at the schematic, you can see the different circuits.
@goldcrownkingmod
2 жыл бұрын
I miss this format. Bring it back :)
@salossi
2 жыл бұрын
This first parcel was not exactly, what you would call a "winner, winner, chicken dinner"... :D
@uberarius
2 жыл бұрын
No new stuff, no screen behind, no unnecessary chatter - brilliant.
@Simon-cu4fi
2 жыл бұрын
They usually use n channel with a boost chip for the high side gates above the positive rail voltage. Probably a bad capacitor for the boost ic
@Commander_ZiN
2 жыл бұрын
I only blew one ESC, because I let someone else borrow the quad and he didn't cut the power when he rammed it into the dirt. I always cut the power if the blades might get locked no issues otherwise but got a spare just in case now.
@stevedaenginerd
2 жыл бұрын
4:30 - "This poor sucker has spilled all his lollies all over the place..."😅🤣😅🤣🤓 I haven't heard that in ages!!! Haha
@dansheppard2965
2 жыл бұрын
You can get Radio 4 Long Wave absolutely everywhere over here in the UK: the transmitters are ridiculously beefy. You can easily pick it up in most of Western Europe. One of the ways our nuclear subs work out if the country's gone up in a puff of smoke while they were underwater is that see if they can pick up Radio 4 LW.
@TheDefpom
2 жыл бұрын
I reviewed the Kaiweets multimeter and put it through its paces on my references and calibrator, I am reviewing multimeters at the moment and doing accuracy testing, I have put a playlist together.
@glasslinger
2 жыл бұрын
This is why quadcopters should never be flown over people or traffic. The motor can short out and take the ESC with it ANY TIME. It is rare, but it DOES HAPPEN!
@renecyberspaced1286
2 жыл бұрын
Christmas cancelled this year?
@8ballfpv
2 жыл бұрын
my hands up. killed many, many motors but usually due to impacts.... :) Should pop up the coast dave and come for a fly!
@LycanWitch
2 жыл бұрын
you use to use the razor knife or your swiss army knife to open behind the camera, when you first got and premiered the dundee knife in video #648, you were infront of the camera. p.s. i miss how you use to compliment the giant knife with crazy eyes like you did in the early videos, made you seem like a lunatic but was pretty funny and epic.
@MultiShizmo
2 жыл бұрын
ESCs usually use a bootstrap circuit for high side switching of n-channel mosfets, they typically don't use p-channel due to the higher Rds.
@lagging_barish3736
2 жыл бұрын
3:10 top side mosfets seem to have a different number on them. Cant figure out what it is exactly but it looks different.
@dhpbear2
2 жыл бұрын
15:00 - They should advertise that screen as 'touch-sensitive'! ;)
@waldemarii
2 жыл бұрын
@7:57 prop adapter screws too long and making contact with the coils. Probably where really close and worn out bearing let the rotor to tilt so that end of the screw started to rub the coils.
@lisadolatowski
2 жыл бұрын
There are 3 phases in the windings of the motor, of which there is 4 poles (2 poles opposite 2 poles) for each phase. 2 of the phases have blown on the motor, so that's why there are 8 of the poles blown (4 poles opposite 4 poles) leaving 1 phase of poles that haven't blown (the other 4 that look ok). Also, all the FETs in that esc should all be N channel. It's just half of them are for the high side, while the other half are for the low side (of the wave). My partner thinks I am a nerd for knowing these things, lol.🤣
@pedro_8240
2 жыл бұрын
Yo dawg, so I head you like christmas trees.
@GrayMatter70
2 жыл бұрын
Dunmaw? DunMAW?! Good lord! I thought Americans could be bad for mangling place names, but that one takes some beating (Ex-Dunmow resident checking in)! As well as the typical day/night rate, the UK also has (or maybe had) some three rate domestic tariffs. I recall being on one that allowed storage heaters to get a boost during the day (mainly because storage heaters weren't very good back then).
@gordonwelcher9598
2 жыл бұрын
Have you heard of Maxwell Chikumbutso? He invented a device that can extract 4KW from stray RF energy in the air.
@BG101UK
2 жыл бұрын
21:08 onwards: The antenna would likely need to be oriented to avoid the signal "null" point and it looks like the case allows for this. Also, the BBC Radio 4 198KHz Long Wave transmissions do travel a fair way (I was listening to it in Barcelona!) but struggle to reach parts of Scotland due to the topography not being good for the mostly ground-wave propogation of long wave transmissions, so the meters would need to use the local Medium Wave repeaters there, or something else.
@pdrg
2 жыл бұрын
I prefer this format and length of mailbag tbh
@robertgarrett5009
2 жыл бұрын
The peak off peak switch is still in use in the uk, so doubt you will find any priority info.
@KeritechElectronics
2 жыл бұрын
Hey, nice to see another one! I really missed them. And your big-ass combat knife. Also, I've never seen you roast a multimeter so fast. Usually you tortured them for a bit longer, adding insult to injury, but this one was so quick. Laughed pretty hard though.
@MadRC
2 жыл бұрын
Usually it’s over current from a burst or a short. the manufactures specs are often plucked out of the air most of the time and frankly can be nonsense. Gear is much better now but while they can say 40A per channel things can be vastly different. While the FET’s can be properly rated the boards can actually burn due to the current though the tracks or caps let go with spikes and burn though the board and short and then it’s fire. Things are better today than ever but a Lipo will easily deliver 200A.
@dhpbear2
2 жыл бұрын
4:07 - They're *strong* AND the N-channel ones appear to be flame-resistant! :)
@gazeddy
2 жыл бұрын
had ceramic caps go dead short on and esc (most likely caused by me using too much heat soldering) causing an esc to nuclear on throttle up.
@AndyPayne42
2 жыл бұрын
Oh, I know! The motor windings simply got very hot and melted causing a short between the mosfet's - think I^2 * Rds. Motors that fly in the air need to be light meaning less copper but you need the current because it is the source for the b-field. As for the P side failing, maybe a difference in Rds vs Temperature profile?
@kopazwashere
2 жыл бұрын
most likely it was a first timer that screwed straight into motor coils and shorted the coils out, which also shorted out the esc
@AndyPayne42
2 жыл бұрын
@@kopazwashere I disagree. While too long of a screw could have scraped of the enamel or squeezed the wire causing a short, that would have most likely happened right away and not the second flight. Also a new timer is most likely using stock screws that came the motor. The fact that the power rating of the ESC far exceeds the motor, I assume he pumped too much current causing the enamel to melt like I described.
@jaycee1980
2 жыл бұрын
Ah good old Rodcalco2007... he also does high voltage stuff, mostly to do with killing wasps ;)
@foobar201
2 жыл бұрын
When something involving the battery goes pear shaped, it's always a fairly energetic affair due to the insane currents these pouch cell lipos can put out. I managed to completely vaporize a pair of 3.5mm bullet connectors once.
@john_ace
2 жыл бұрын
I was totally oldschooled... gnarly!
@martinda7446
2 жыл бұрын
Great multimeter review. I was laughing a lot as you squeezed the life out of the LCD. Terrible Muriel!
@15fakeaccount
2 жыл бұрын
15:24 We are now only missing 1 Grit.
@atkelar
2 жыл бұрын
I still have a similar "night time power" circuit here for hot water in my workshop location (Austria, not Australia in this case!) Not sure if it works via radio transmission or if they push some signal thorugh the normal wires though. The way I heard it described, it was a wire based signal...
@TobyRobb
2 жыл бұрын
Dave I have absolutely updated latest firmware by the IR. Options even to allow the ir to pulse once per w/h for external capture by a monitor.
@stevenbliss989
2 жыл бұрын
Having the power company telling you when you can have hot water --- WTF!!!!!!!!!!!!!!!!!!
@gamerpaddy
2 жыл бұрын
maybe the propeller broke, ive had a few escs die when hooked up to motors without a load. maybe the back emf voltage got too high for those fets. once one of them short out (they are all n channel on highside nowadays) the high energy density batteries do the rest. a small quad with 4..500g can pull up to 2..3kW from them when accelerating hard
@jp-hh9xq
2 жыл бұрын
4:17 I'm dying!!! 🤣🤣🤣😂😂😂😁👏
@jimbrown563
2 жыл бұрын
Heat-Shrink-Tubing makes a really poor Heat-Sink. Self-Inflicted-Destruction.
@michaelmiller641
2 жыл бұрын
That ferrite rod antenna could, if it's at the right angle, almost null out radio 4 on 198 khz
@jrhowrey
2 жыл бұрын
used mounting screws that were too long and ran into the motor windings
@rodrigomaero
2 жыл бұрын
The quadcopter motor driver, maybe the P channel mosfets have greater Rds(on) and thus pumping more heat when both P and N are on
@juweinert
2 жыл бұрын
Did that meter actually feature a split amps socket and lead detection? Nice touch
@paulperano9236
2 жыл бұрын
Come on Fella, the LCD screen is a new improved entertainment feature 🙂
@Lucien86
2 жыл бұрын
It needs a game too. For maximum suffering I recommend knockoff Tetris.
@markxr1
2 жыл бұрын
Maybe the drone ESC was the type which uses N-Channel mosfet on the low and high side, using bootstrap driver circuits? That's certainly common. Still very burnt.
@Wolfhound.
2 жыл бұрын
might be fun to bypass the fuse in the meter and pop it :D
@jimmio3727
2 жыл бұрын
First thing you do with a meter is plug it into mains. If you ever get a free one from Harbor Freight Tools in the US? Boom.
@TinLethax
2 жыл бұрын
Love how they wrote on the box "not Austria please" lol.
@vincei4252
2 жыл бұрын
I won't lie, I skipped the multimeter segment. Don't judge me :)
@gglovato
2 жыл бұрын
Ohh, a rodalco shoutout, been following him forever but i have a super hard time understanding his accent
@erikdenhouter
2 жыл бұрын
Maybe the shielding on the relay is to prevent feedback to the LW receiver.
@smeegle
2 жыл бұрын
Its possible the motor itself was not insulated very well and somwhere found a path to ground through the (conductive) carbon fibre frame, that would explain only the positive side blowing up
@CliveChamberlain946
2 жыл бұрын
Old school still works Dave!
@richardloxley
2 жыл бұрын
I like the shorter ‘bite size’ running length. When Mailbag was an hour long I’d only have time to watch half, and then I’d need to remember to watch the second half another day (because KZitem’s algorithm wouldn’t show it to me again because I’d already 'watched' it. I much prefer videos that are 30 min or less.
@xsauce3858
2 жыл бұрын
where can i buy that christmas tree ?
@jim5148
2 жыл бұрын
The Christmas tree USB cord comes out the back probably because it's designed to stand up. I don't have an opinion on the ESC and motor as that would take some actual electronic expertise on my part. Thanks for the video!
@germimonte
2 жыл бұрын
I assume it's just for magnetic noise or maybe accidental triggerings, if you really wanted hot water you'd just bypass that thing
@jaycee1980
2 жыл бұрын
and there would be evidence of you having done that, and you would be prosecuted.
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