33:57 why is there writing on the inside, behind the LCD and board? Did they recycle cardboard advertisement for this? At least that's one enviromental thing about it...
I worked as an AXE 10 test plant support engineer and AXE 10 program producer, then later I also ran production for AXE 10 software systems, then became Unix / AXE / Net admin / developer / tester. Loved every moment of it, Ericsson was a great company to work for. Switched over to mechanical engineering now. Great seeing AXE stuff. (It's not pronounced like the wood chopping device... AXE is an Ericsson product code and is just pronounced "A" "X" "E"....)
16:00 Just a note about RS-232, the address is set on the computer. Those switches would be for changing the baud rate, parity, bits, or such, which the host computer would have to match.
"Person unknown from company unknown" ... in Osborne Park, WA. A quick flyover on the Google Maps suggests only a couple of candidates. But you didn't hear it from me!
I have an old MOSTEK 38P70 with the piggyback ROM chip that came from a very old General Instruments satellite receiver. It's a nice design. www.cpu-world.com/CPUs/3870/Mostek-MK38P70-02%20(97400A).html
Transmitter 17:20 - The coaxial line is shorted and operates as a resonant circuit and is part of the VCO for the PLL-Circuit. To prevent mechanical microphone effects of a simple L / C oscillating circuit - 73 de DL1LAJ
The 3D printed part is probably because they make them with different sockets on the front and so they only need that specific part for the Australian socket.
Hey Dave, my dad was a dermatologist and he'd receive all types of promotional materials (bribery) from pharma/skincare companies- free samples of sunscreens and lotions, literature detailing various products, other branded doodads- to convince him to use or recommend their product to his patients. So the Rogaine ad is most likely something mailed or handed out at a trade show to a doctor or specialist- only meant for their eyes, so it's still wasteful, but less so than if it were in a major circulation magazine. Seems like a pretty cunning advertising strategy actually. Convince a single person trusted by dozens, hundreds, thousands of people to promote your product rather than spend time and money reaching and convincing every individual to trust your company and then buy your product! In fact, I signed up for Tron Club because you were impressed by it and recommended it in one of your mailbags :p PS- I only recently came across your channel, and although I know next to nothing about electrical engineering, or maybe because of that fact, I absolutely love your work and I feel like I'm really learning a lot! Cheers!
In those telco systems they seem to just love hybrids and laser trimming. I have a couple of these from a similar system: i.stack.imgur.com/cAiz4.jpg and rumour has it that they need to trim them to have really good signal quality for not mangling fax and modem transmissions.
Piggyback packages are still around, look into POP (Package on package) on stuff like the Broadcom SOC on the Raspberry Pi etc. :) - the digital advertisement is using an AllWinner ARM926-EJS E200-CPU.
Dave, de-cap one of those ASICs off the gridseed and put it under your microscope! I used to own two Antminer S2's that were 10 ASIC blades in a 4 u chassis that pulled around 1kw per chassis. I'd love to see what they did one their dies!
I've fixed those miners before. The board has two power supplies on it: - A dinky 3.3V linear reg, supplied off USB, that feeds the ARM micro which serves as control and PC interface. - A buck converter that supplies 2.5V for the mining chips, fed off the DC jack. It's a very obscure but high-efficiency synchronous buck converter. Looks like that's the section that failed. I have one where the ARM chip failed. I could replace it, but without a firmware image that wouldn't be enough to get it working. Although, if I had the chip off of yours... yes, that would probably let me get mine going. I'll send you a cool home-built PWM solar charge controller in return, if you want. Also, you're off about the heatsinks. It's not lots of litte ones: It's designed for a single huge heatsink that serves all the ASICs together.
At 17:15 - looks like coax stub shorted at one side, which can function as bandpass or notch filter at certain frequencies. Maybe to suppress harmonics
The Rogaine thing is not intended to be sent to millions of balding guys so that they run to the doctor to get the stuff, that would be cost prohibitive. It is a limited production run to be sent to doctors. There is SO MUCH MONEY in pharma that this makes sense. Also, the NEW COOL thingy curiosity factory kicks in to open and play this - which keeps it in the mind of the doctor when he meets his patients. Perfectly logical!
26:00 My guess is that there had been attempts to overclock and overvoltage that miner. The miners are basically paperweights by that point so I guess it doesn't hurt to experiment.
Looks like it has a small voltage regulation area on the board, so it almost certainly takes 12 volts in, and regulates it to whatever core voltage the ASIC's need. I'd guess around 1 to 2 volts, at high amperage. Those IRF parts looked almost identical to the stuff used on CPU power stages on modern enthusiast motherboards. This might explain why it went so catastrophically explodey - very high amperage available (could be up to a hundred amps), so once a short develops, it gets really exciting.
I would love to have one too. You can get them from eBay, friends and relatives or most likely dumpsters. Sometimes you can get them from company representatives.
I work for a national drugstore chain and these types of things arrive all the time! Along the course of a year, at least 4 to 6 of these kinds of advertisement displays get put out on the floor, and subsequently thrown away once the promotion ends.
@EEVblog: Dave, that semi rigid coax in the 440 MHz message transmitteris no section connection. Look closer at the picture. Soldering! It is shorted at one end of it by a big soldering blob. So all it is it's just a resonant "stub", nothing else than a coil (the inner wire in it) surrounded by a tube which then forms very well defined capacity with very high "q". So, it's just a *LC-filter* or resonant and highly tuned L-C circuit!
That purple ceramic stuff is so neat. I wish I would have something like that in my collection of old chips, but so far got nothing like it. Btw, in the compliance tester I would say that the other coils were the 250uH and not the ones Dave have pointed to. Also, on the RS232-to-radio board, that coax was not linking two sections, but it had the function of an inductor, since on the other side the signal was going right to ground.
Dave, funny when you're unpacking the phone boards, you were reading off the list but handling a different board! I actually used to repair & test the Alcatel boards when they were manufactured back in the 90's. Had a bit of chuckle at your conclusion to those hybrid chip's marked BELL. From memory they didn't have a lot to do other than they couldn't fit the components on the boards so they went sideways and up. They were marked BELL because they were manufactured in Belgium and were a standard part for BELL telecom boards. The Alcatel board went into the first digital exchanges in Australia (System 2000), taking over from the purely analogue AXE exchanges that had been used for 15-20 years previous. System 2000 also had boards for when the cell network changed over from analogue to digital (one of the better jobs where I used to drive around Sydney and suburbs testing the cell network). Most of the exchanges at the time used generic boards and custom software for each country - Australian Telecom (before Telstra) was probably the most demanding in that respect. That guy would have been made when Alcatel broke into a subsidiary (the manufacturing side was called Bluescope), little bit after I started working on the software side of the exchanges. On a side note, Alcatel also made the AXE boards for exchanges as Telecom never wanted to be without operational exchanges - ever! Hence why two manufacturers. There was always built in redundancy.
When it comes to power sockets, the UK style 3 pin are the best for being secure once plugged into the socket. There is a lot more surface area in contact with the pins. The US types I find waggle out easily. The Aussie ones are slightly better but still not as secure as the UK types :) The 2 pin Euro with the earth are also good if you don't use cheap Chinese sockets :)
Ah yes, I recall when I was younger that plugs where rated for 15A on the old round pin versions. Before my time :) for but I do remember swapping out the old round pin plugs on a number of valve radio's.
BS 546 round-pin plugs are still made and the standard is still current with the last amendment made in 1999. It's the basis for SA and Indian plug standards.
Graham Langley That seems odd. The Australian / NZ plugs are much smaller cross-section and can carry up to 15 A (the usual is 10 A, but the only difference is a bigger earth blade used to prevent inserting a 15 A appliance into a 10 A rated socket). China use the same pin arrangement, but inverted (to mimic the UK earth at top position).
17:19 is not hardline coax connecting 2 sections of RF, it's probably an RF stub filter (though they can also be used as an oscillator or matching network, depending on design intent). Conjugation means they can be used in short- or open-circuit configuration depending on the desired effect. Fascinating things. Proof: the right end has solder shorting the inner to the outer, forming a short circuit at the end of a quarter wave stub (taking into account the velocity factor of the hardline) It's a common trick to get rid of harmonics, as a rough guess I'd say it's tuned (sized) to a quarter wave of the 3rd harmonic, so approximately 1350-1370 MHz. I'm guessing it's about 4 to 5cm long for that frequency. It will also be effective at higher odd-order harmonics too. Variable/tunable ones can be made by using a slightly shorter stub and connecting a variable cap or inductor across the bottom of the stub giving a limited range of adjustment. This one is fixed because it's soldered, although there seems to be a pad to the right end where a variable cap could have been planned just in case it needed tweaking. First, roll your trouser leg up, spin around 3 times and say the magic incantation "Faraday Maxwell VVV, RF powers envelop me" then see: www.microwaves101.com/encyclopedias/quarter-wave-tricks
@Dave Jones. the piggyback tactic is commonly used but only in smaller devices. If you take apart your smart phone (especially apple) you will usually find the memory on top of the arm processor. I think it is generally avoided due to increased distance from signal lines and the decoupling caps.
Just got this one to the office and Tekbox actually had thise video linked on their product website, so I needed to go check. The Dave moan of pleasure at 10:47 is priceless :D
In the US about $60,000 is spent on marketing per doctor per year, (as in advertising directly to the doctor) to convince them to prescribe certain medications. If the doctor doesn't prescribe enough, their database is kept at the pharmacy, and they can expect a call asking why they haven't shelled out enough crap to their patients. #Medicare for all.
Okay the box-in-box extraction was already pretty funny, but I have to point out that it would be rippingly funnier if you'd briefly ramped down to slo-mo for the little kick at the end.
Hey Dave: Can't find those attenuators on the Tekbox site. Have you got a part number? I have taken RF attenuator and adaptor kits through customs and security lots of times in lots of countries. They never seem bothered by them.
Spector NS5 RD not even just that, read off the flash contents and see if you can hack it to play your own videos. Probably uses Linux like he said using a very basic video codec like H.264 and some additional services to drive the LCD and take user input
I worked for Telstra in the DDN network centre. Very familiar with the NTU. That is a rack mounted NTU, but was also available as a stand alone unit. AWA made a similar NTU for the DDN network.
dont forget one of this guy's taglines is "if you have to ask the price, you cant afford it" so that is effectively trash to him. I find myself disappointed he did not even try to plug it into a computer to see whats up in that realm.
I'd love to find one of those electronic video adverts. I have many uses for them. I wonder how difficult it would be to encode videos for these so you can put your own content on it.
I received one of the advertising thingy from a real estate agent. the mini usb you can plug into a PC and change the video file it also charges the battery. :)
I find it quite puzzling that they reccomend placing the D.U.T. directly on the metal ground plate. For a proper pre-compliance setup you should place your D.U.T. 80cm above the metal GND plane. This can severely influence your measurement results, specificaly in the 5-30MHz range.
the Rogaine advertisement. My dad is a doctor and i have such thing as well. Is there anything I could do to this? I ripped it appart and was curious to see what's inside. It looked totally the same (but without buttons). Is there any chance to access the custom Linux or reprogrmm this thing? Any advice?
The piggy back micro-controller was for development purposes. You could use an EPROM emulator to develop your code in the final circuit and reprogram in seconds. Using the EPROM version of the 8051, for example, took 5 to 30 minutes for each program-test-change-reprogram cycle. Your final product may not need or have a full data & address buss to justify putting your EPROM on the PCB. All before they invented ICSP flash micro-controllers.
Hmm could you use a LISN to get rid off noise on the ground line? We keep having issues with in-house compliance, especially in regards to leakage current, since our industrial company with it's tons of heavy machinery also has a stunningly polluted PE, which keeps messing with the compliance measurement for leakage current.
Awesome, my dead Gridseed board made it intact! That was pretty darn fast. I have to assume that there was a fire in the overcrowded rack that the mining house was running the unit in.
I am not quite sure I get exactly what the mains network thing does... Do you basically plug the device to be tested in to it and then the machine supplies the appropriate power while measuring how much electrical interference runs back out? If so then that is very interesting! I did not realize interference could flow out of devices and back in to the mains! Unless this is one of Dave's jokes--in which I doubly don't get it!
WOW, plugging in the EPROM (or ROM) directly on top of the CPU of course shortens the distance for any signal to travel which of course makes any system faster...Pity this is not done today on a regular basis!
That rogaine thing is not for doctor's offices, it's marketing *to* doctors. That's at least a vaguely promising market for this sort of thing, because the potential profit from convincing a doctor to prescribe is huge. But definitely disposable, although highly targeted.
It would be interesting a brief study about the cost of that rogaine advertising micropanel - if good enough (the cost) I see a great niche - could we do it better and cheaper? new ideas? how would you do it for thinner profile, better visual impact and of course way better cost?
can u also use the TBLC08 for DC measurements? Since there are only pasive components.. it seems we can connect up to 350Vdc in the mains input. Is this correct?
Not much different from the old Dataradio VHF wireless modems, except those have a separate radio in them. The HD63P01 is a 68P01, a microcontroller designed to piggyback to a ROM chip. They used to be a common solution for 6800-based embedded applications.
That piggy back chip reminds me of the clock add on chip for the Tandy TX 1000. You unplugged the, I think, processor and plugged in the clock chip then the processor piggy backed on top of that.
YT user "Peter Brockie" did a video on a similar electronic advert, I think you can search his channel for "video playing junk mail" if you want to see it
If you already have a bench setup with integrated isolation transformer, variac, breakers, filters and display panels then integrating a lisn into that would maybe make more sense than to have a seperate box around. But looking at those nice inductors, maybe it makes most sense to buy that thing, throw the case away and put it into my setup box... or... first build a larger box so it can fit in....
Any interesting mix of items today. Learned some things and had some memories jogged as well. I remember those line interface cards or more specifically the ones used in PABX. Often have just one huge card to support a ISDN Primary rate of only 30 phones lines.
33:57 why is there writing on the inside, behind the LCD and board? Did they recycle cardboard advertisement for this? At least that's one enviromental thing about it...
Yeh, I noticed that.
Dave I love ur videos words cannot express how much I appreciate you. You've set my life trajectory towards EE
]
I worked as an AXE 10 test plant support engineer and AXE 10 program producer, then later I also ran production for AXE 10 software systems, then became Unix / AXE / Net admin / developer / tester. Loved every moment of it, Ericsson was a great company to work for. Switched over to mechanical engineering now. Great seeing AXE stuff. (It's not pronounced like the wood chopping device... AXE is an Ericsson product code and is just pronounced "A" "X" "E"....)
16:00 Just a note about RS-232, the address is set on the computer. Those switches would be for changing the baud rate, parity, bits, or such, which the host computer would have to match.
"Person unknown from company unknown" ... in Osborne Park, WA. A quick flyover on the Google Maps suggests only a couple of candidates. But you didn't hear it from me!
Piggyback packages were often available for mask-ROM MCUs for development. They were very expensive though.
Yes, I've seen them as special snowflakes used for system debugging and developing. Can't recall having seen one in production before though.
i have to say very cool chip tho. dave what are you planing to do with that board?
Raspberry Pi piggybacks RAM on the CPU. Not as easy to get the 2 apart though!
they are bga's hot air will probably do the trick
I have an old MOSTEK 38P70 with the piggyback ROM chip that came from a very old General Instruments satellite receiver. It's a nice design.
www.cpu-world.com/CPUs/3870/Mostek-MK38P70-02%20(97400A).html
Thomson, not Rockwell
aussie aficionados... ¬¬
Rockwell not Thomson
Damm Just checked...you are right Thomson
Mike is never wrong.
You get paid by the comment?
mail bag is always a fun episode of the EEVBOLG thanks
14:49
Sniffing glue... this actually explains some things, Dave.
Those old boards would be great, embedded in clear epoxy and used to make a coffee table or work bench top.
tom7601 - That's actually a great idea!
Sat at Dublin airport, just heard my flight s been delayed.. Dave saves the day with a new video
Thank you Dave for making these videos
Transmitter 17:20 - The coaxial line is shorted and operates as a resonant circuit and is part of the VCO for the PLL-Circuit. To prevent mechanical microphone effects of a simple L / C oscillating circuit - 73 de DL1LAJ
The 3D printed part is probably because they make them with different sockets on the front and so they only need that specific part for the Australian socket.
Am I the only one who thinks that the person who sent the Rogaine video display should have put a 'Rick Roll' video on it? :-D
Hey Dave, my dad was a dermatologist and he'd receive all types of promotional materials (bribery) from pharma/skincare companies- free samples of sunscreens and lotions, literature detailing various products, other branded doodads- to convince him to use or recommend their product to his patients.
So the Rogaine ad is most likely something mailed or handed out at a trade show to a doctor or specialist- only meant for their eyes, so it's still wasteful, but less so than if it were in a major circulation magazine.
Seems like a pretty cunning advertising strategy actually. Convince a single person trusted by dozens, hundreds, thousands of people to promote your product rather than spend time and money reaching and convincing every individual to trust your company and then buy your product!
In fact, I signed up for Tron Club because you were impressed by it and recommended it in one of your mailbags :p
PS- I only recently came across your channel, and although I know next to nothing about electrical engineering, or maybe because of that fact, I absolutely love your work and I feel like I'm really learning a lot!
Cheers!
Rifa hybrids look like they've been laser trimmed. Maybe done like this for surge/spike tolerance
Yes they were laser trimmed.
Maybe the easiest way to get matching high voltage resistors in the given space.
In those telco systems they seem to just love hybrids and laser trimming. I have a couple of these from a similar system: i.stack.imgur.com/cAiz4.jpg and rumour has it that they need to trim them to have really good signal quality for not mangling fax and modem transmissions.
probably for protection against high voltage peak caused by induction from lightning
Do you think they have trimmed and matched them because they are part of some differential input?
Piggyback packages are still around, look into POP (Package on package) on stuff like the Broadcom SOC on the Raspberry Pi etc. :) - the digital advertisement is using an AllWinner ARM926-EJS E200-CPU.
That makes more sense. I have a onehunglo media player/photo viewer thingy with that same chip on it. Would have been surprised if it was PPC.
If you can't unplug it then it don't count!
Dave, de-cap one of those ASICs off the gridseed and put it under your microscope! I used to own two Antminer S2's that were 10 ASIC blades in a 4 u chassis that pulled around 1kw per chassis. I'd love to see what they did one their dies!
24:12 120 ohm termination / line match to 50 ohm? I reckon this was part of the telstra - Optus STP (signal transfer point) maybe?
I've fixed those miners before. The board has two power supplies on it:
- A dinky 3.3V linear reg, supplied off USB, that feeds the ARM micro which serves as control and PC interface.
- A buck converter that supplies 2.5V for the mining chips, fed off the DC jack. It's a very obscure but high-efficiency synchronous buck converter. Looks like that's the section that failed.
I have one where the ARM chip failed. I could replace it, but without a firmware image that wouldn't be enough to get it working. Although, if I had the chip off of yours... yes, that would probably let me get mine going. I'll send you a cool home-built PWM solar charge controller in return, if you want.
Also, you're off about the heatsinks. It's not lots of litte ones: It's designed for a single huge heatsink that serves all the ASICs together.
Mailbag, I'm usually asleep when these come out. Nice to see one right when it's released for once. Cheers Dave!
At 17:15 - looks like coax stub shorted at one side, which can function as bandpass or notch filter at certain frequencies. Maybe to suppress harmonics
could also be a coax resonator for the VCO, but the coax looked a bit short to be quarter wave at 470 MHz...
Very nice inductors at 11:45. Looks like they used the spool the magnet wire was on for 2 of them.
The Rogaine thing is not intended to be sent to millions of balding guys so that they run to the doctor to get the stuff, that would be cost prohibitive. It is a limited production run to be sent to doctors. There is SO MUCH MONEY in pharma that this makes sense. Also, the NEW COOL thingy curiosity factory kicks in to open and play this - which keeps it in the mind of the doctor when he meets his patients. Perfectly logical!
He said that in the video
26:00 My guess is that there had been attempts to overclock and overvoltage that miner. The miners are basically paperweights by that point so I guess it doesn't hurt to experiment.
Also, since it's just the powersupply that has fried my guess is that it could have been saved by supplying the 3.3V or whatever it is externally.
Looks like it has a small voltage regulation area on the board, so it almost certainly takes 12 volts in, and regulates it to whatever core voltage the ASIC's need. I'd guess around 1 to 2 volts, at high amperage. Those IRF parts looked almost identical to the stuff used on CPU power stages on modern enthusiast motherboards.
This might explain why it went so catastrophically explodey - very high amperage available (could be up to a hundred amps), so once a short develops, it gets really exciting.
I would love to have one of those little electronic advertisements things to play with, where can i get one from?
I would love to have one too.
You can get them from eBay, friends and relatives or most likely dumpsters.
Sometimes you can get them from company representatives.
I work for a national drugstore chain and these types of things arrive all the time! Along the course of a year, at least 4 to 6 of these kinds of advertisement displays get put out on the floor, and subsequently thrown away once the promotion ends.
Phillip C Any chance you could send me some? I would really like to have some to.mess about with.
The SOC is not a powerpc part but actually an Allwinner E200 ARM9 part.
17:20 with the center pin to ground it's more likely a filter?
@EEVblog: Dave, that semi rigid coax in the 440 MHz message transmitteris no section connection. Look closer at the picture. Soldering! It is shorted at one end of it by a big soldering blob. So all it is it's just a resonant "stub", nothing else than a coil (the inner wire in it) surrounded by a tube which then forms very well defined capacity with very high "q". So, it's just a *LC-filter* or resonant and highly tuned L-C circuit!
That purple ceramic stuff is so neat. I wish I would have something like that in my collection of old chips, but so far got nothing like it.
Btw, in the compliance tester I would say that the other coils were the 250uH and not the ones Dave have pointed to. Also, on the RS232-to-radio board, that coax was not linking two sections, but it had the function of an inductor, since on the other side the signal was going right to ground.
Dave, funny when you're unpacking the phone boards, you were reading off the list but handling a different board! I actually used to repair & test the Alcatel boards when they were manufactured back in the 90's. Had a bit of chuckle at your conclusion to those hybrid chip's marked BELL. From memory they didn't have a lot to do other than they couldn't fit the components on the boards so they went sideways and up. They were marked BELL because they were manufactured in Belgium and were a standard part for BELL telecom boards. The Alcatel board went into the first digital exchanges in Australia (System 2000), taking over from the purely analogue AXE exchanges that had been used for 15-20 years previous. System 2000 also had boards for when the cell network changed over from analogue to digital (one of the better jobs where I used to drive around Sydney and suburbs testing the cell network).
Most of the exchanges at the time used generic boards and custom software for each country - Australian Telecom (before Telstra) was probably the most demanding in that respect. That guy would have been made when Alcatel broke into a subsidiary (the manufacturing side was called Bluescope), little bit after I started working on the software side of the exchanges.
On a side note, Alcatel also made the AXE boards for exchanges as Telecom never wanted to be without operational exchanges - ever! Hence why two manufacturers. There was always built in redundancy.
20:00 3D stacking! Hehe... We can do this now at die level easily. :)
When it comes to power sockets, the UK style 3 pin are the best for being secure once plugged into the socket. There is a lot more surface area in contact with the pins. The US types I find waggle out easily. The Aussie ones are slightly better but still not as secure as the UK types :) The 2 pin Euro with the earth are also good if you don't use cheap Chinese sockets :)
The UK BS 1363 plug and socket were apparently designed to be 15A just like the BS546 round pin ones but had to be derated to 13A.
Ah yes, I recall when I was younger that plugs where rated for 15A on the old round pin versions. Before my time :) for but I do remember swapping out the old round pin plugs on a number of valve radio's.
BS 546 round-pin plugs are still made and the standard is still current with the last amendment made in 1999. It's the basis for SA and Indian plug standards.
Graham Langley
That seems odd. The Australian / NZ plugs are much smaller cross-section and can carry up to 15 A (the usual is 10 A, but the only difference is a bigger earth blade used to prevent inserting a 15 A appliance into a 10 A rated socket). China use the same pin arrangement, but inverted (to mimic the UK earth at top position).
SchuKo with integrated child-protection > everything
2:45 am, and i'm supposed to get to the airport at six... Thanks Dave.
my favorite segment :-)
Thank you Dave!!
17:19 is not hardline coax connecting 2 sections of RF, it's probably an RF stub filter (though they can also be used as an oscillator or matching network, depending on design intent). Conjugation means they can be used in short- or open-circuit configuration depending on the desired effect. Fascinating things.
Proof: the right end has solder shorting the inner to the outer, forming a short circuit at the end of a quarter wave stub (taking into account the velocity factor of the hardline)
It's a common trick to get rid of harmonics, as a rough guess I'd say it's tuned (sized) to a quarter wave of the 3rd harmonic, so approximately 1350-1370 MHz. I'm guessing it's about 4 to 5cm long for that frequency. It will also be effective at higher odd-order harmonics too.
Variable/tunable ones can be made by using a slightly shorter stub and connecting a variable cap or inductor across the bottom of the stub giving a limited range of adjustment. This one is fixed because it's soldered, although there seems to be a pad to the right end where a variable cap could have been planned just in case it needed tweaking.
First, roll your trouser leg up, spin around 3 times and say the magic incantation "Faraday Maxwell VVV, RF powers envelop me" then see:
www.microwaves101.com/encyclopedias/quarter-wave-tricks
yes you are right - i also think it,s a part of the Oscillator (VCO) because the shorted stub
Greetings from the United States of America! Love your content and thanks for the quality entertainment! Good on ya!
In that uhf transmitter, that short piece of coax is the tank inductor for the VCO I think. One end of it being shorted is the main suggestion of this
32:29 What edition was it? i need to know it.... for scientific purposes.
@Dave Jones. the piggyback tactic is commonly used but only in smaller devices. If you take apart your smart phone (especially apple) you will usually find the memory on top of the arm processor. I think it is generally avoided due to increased distance from signal lines and the decoupling caps.
Just got this one to the office and Tekbox actually had thise video linked on their product website, so I needed to go check.
The Dave moan of pleasure at 10:47 is priceless :D
In the US about $60,000 is spent on marketing per doctor per year, (as in advertising directly to the doctor) to convince them to prescribe certain medications. If the doctor doesn't prescribe enough, their database is kept at the pharmacy, and they can expect a call asking why they haven't shelled out enough crap to their patients. #Medicare for all.
You can still buy those 1AB01418 line interface hybrids; they've been made by a few different manufacturers other than Alcatel.
Okay the box-in-box extraction was already pretty funny, but I have to point out that it would be rippingly funnier if you'd briefly ramped down to slo-mo for the little kick at the end.
Hey Dave: Can't find those attenuators on the Tekbox site. Have you got a part number? I have taken RF attenuator and adaptor kits through customs and security lots of times in lots of countries. They never seem bothered by them.
Look at all those nice caps at 21:16! All those red caps are WIMA MKP polypropylene film caps, beautiful
If i seen those LCD advertisements in my Dr's office, i would take as many as i could. free speakers and Lipo's!!!!! Yay!!!
Right?? I saw that thing like "ooo free toys!"
Spector NS5 RD not even just that, read off the flash contents and see if you can hack it to play your own videos. Probably uses Linux like he said using a very basic video codec like H.264 and some additional services to drive the LCD and take user input
For the magazine, were you thinking of the 2008 issue of Esquire with the eInk displays?
I worked for Telstra in the DDN network centre. Very familiar with the NTU. That is a rack mounted NTU, but was also available as a stand alone unit. AWA made a similar NTU for the DDN network.
34:30 Am i the only one who cringed at the tape "removal" (and subsequent risk of tearing the LCD flex ribbon)?
it physically hurt to watch
Say no to senseless violence! Even if it's "only" electronics, cheap as they may be :P
He's broken a bunch of mailbag items by just manhandling them and then seeing the note "Please be careful!!"" :D
dont forget one of this guy's taglines is "if you have to ask the price, you cant afford it" so that is effectively trash to him. I find myself disappointed he did not even try to plug it into a computer to see whats up in that realm.
It's a rogaine ad.
Re your comment 33:40 - 33:50 - right on Dave, couldn't agree more.
I'd love to find one of those electronic video adverts. I have many uses for them. I wonder how difficult it would be to encode videos for these so you can put your own content on it.
I honestly don't see how these auto play video ad things are viable. Are these that much more effective then a paper, TV/radio or web Ad?
The burned board around 28mins. I'm guessing lightning strike?
The rigid coax looks shorted on one side, so a kind of resonator may be its purpose.
I received one of the advertising thingy from a real estate agent. the mini usb you can plug into a PC and change the video file it also charges the battery. :)
I find it quite puzzling that they reccomend placing the D.U.T. directly on the metal ground plate. For a proper pre-compliance setup you should place your D.U.T. 80cm above the metal GND plane. This can severely influence your measurement results, specificaly in the 5-30MHz range.
"That's practically DC to daylight"
the Rogaine advertisement. My dad is a doctor and i have such thing as well. Is there anything I could do to this? I ripped it appart and was curious to see what's inside. It looked totally the same (but without buttons). Is there any chance to access the custom Linux or reprogrmm this thing? Any advice?
The piggy back micro-controller was for development purposes. You could use an EPROM emulator to develop your code in the final circuit and reprogram in seconds. Using the EPROM version of the 8051, for example, took 5 to 30 minutes for each program-test-change-reprogram cycle. Your final product may not need or have a full data & address buss to justify putting your EPROM on the PCB. All before they invented ICSP flash micro-controllers.
17:15 , is it a coax or an opto coupler?
...I want one of those adverts, they look amazing!
hey is that passive crossover network?
Hmm could you use a LISN to get rid off noise on the ground line? We keep having issues with in-house compliance, especially in regards to leakage current, since our industrial company with it's tons of heavy machinery also has a stunningly polluted PE, which keeps messing with the compliance measurement for leakage current.
On the small PBX (I guess) line card, those things are presumably made by or for the Bell telephone company, AKA Lucent.
Awesome, my dead Gridseed board made it intact! That was pretty darn fast.
I have to assume that there was a fire in the overcrowded rack that the mining house was running the unit in.
That electronic ad is just ridiculous. What a waste of perfectly good electronics.
I learned something new today. Thank you
Hello Dave! How often do you sharpen this Dandy knife?
19:45 - the same solution - IC over another IC - is used in Raspberry Pi, where the RAM IC is soldered on the CPU
had also such advertisement for enterprise computer hardware
HP 48 G/GX in the background (6:25) David ?
17:15 is that a stub filter?
perhaps the 3d printed part is to fit different sockets on a whim or as parts change.
That Rogain-thingy is GREAT for tinkering - a free LCD and microchip :P
19:44 love this reaction :D
Your Croccodile Dundee knife isn't sharp anymore ?
This looks like i could be a very interesting tutorial/ demo for pre-compliance testing equipment and methods. I would love to see it!
I am not quite sure I get exactly what the mains network thing does... Do you basically plug the device to be tested in to it and then the machine supplies the appropriate power while measuring how much electrical interference runs back out? If so then that is very interesting! I did not realize interference could flow out of devices and back in to the mains!
Unless this is one of Dave's jokes--in which I doubly don't get it!
Dave: You just made a *BLACH HOLE* at 27:55. The Large Hardron Collider cannot generate them so efficiently...
WOW, plugging in the EPROM (or ROM) directly on top of the CPU of course shortens the distance for any signal to travel which of course makes any system faster...Pity this is not done today on a regular basis!
That rogaine thing is not for doctor's offices, it's marketing *to* doctors. That's at least a vaguely promising market for this sort of thing, because the potential profit from convincing a doctor to prescribe is huge. But definitely disposable, although highly targeted.
It looks like a generic devkit board inside the ad, btw - lots of solderpads free, even.
At least the 360p potatovision is progressive scan and not interlaced.
Paul Hicks TH-cam was processing it still its available in 1080p if you reload it now
Adam Bacon Its all good :)
360i... that's a horrible resolution
It's pretty much a free service you're being entertained with.
Knuckles the Echidna not when you don't enjoy the 'entertainment' in the first place and end up muting the audio.
The rigid coax is likely a 1/4 wave transformer for the output circuit to match the impedance of the antenna. Smith charts anyone?
It would be interesting a brief study about the cost of that rogaine advertising micropanel - if good enough (the cost) I see a great niche - could we do it better and cheaper? new ideas? how would you do it for thinner profile, better visual impact and of course way better cost?
can u also use the TBLC08 for DC measurements?
Since there are only pasive components.. it seems we can connect up to 350Vdc in the mains input. Is this correct?
Not much different from the old Dataradio VHF wireless modems, except those have a separate radio in them.
The HD63P01 is a 68P01, a microcontroller designed to piggyback to a ROM chip. They used to be a common solution for 6800-based embedded applications.
That piggy back chip reminds me of the clock add on chip for the Tandy TX 1000. You unplugged the, I think, processor and plugged in the clock chip then the processor piggy backed on top of that.
I want one of those ads. I could not find them on ebay.
I now, Ricoh make them (30:14). You can mount it as a drive and copy your video as a .avi on it. Like 1.avi for button one ens.
It's Mil-PEE-tus. One of the towns of the South Bay (of the SF Bay Area), part of Silicon Valley.
Waiting on 1000, Dave!
YT user "Peter Brockie" did a video on a similar electronic advert, I think you can search his channel for "video playing junk mail" if you want to see it
They still stack memory on top of CPUs, but nowadays it's more like a big ass SDRAM on top of an SOC.
If you already have a bench setup with integrated isolation transformer, variac, breakers, filters and display panels then integrating a lisn into that would maybe make more sense than to have a seperate box around. But looking at those nice inductors, maybe it makes most sense to buy that thing, throw the case away and put it into my setup box... or... first build a larger box so it can fit in....
A literal tear down!
I'd love to have Dave as a next door neighbor and friend`. Really nice guy.
Toward the end of the Jeb Bush campaign in 2016 when they were just throwing away money, they had those LCD advertisement mailed out.
Any interesting mix of items today. Learned some things and had some memories jogged as well.
I remember those line interface cards or more specifically the ones used in PABX. Often have just one huge card to support a ISDN Primary rate of only 30 phones lines.