Kinda disagree with this take. You're not taking into factor one of the most important factors of a handheld device, and that's gravimetric design. Yes, you could double the battery size ... but how heavy is that already heavy 13" device going to become? 10 hours is a fine amount of screen on time for a device like this, 20 hours won't change the game that much. However, a heavier device will fatigue the user quicker and effectively limit the scenarios where you could comfortably use it, to the point where it makes more sense just to buy a laptop. They really should be marketting weight instead of thinness, but apple has always done thinness first :\

Forget about 12-bit resolution, buy it for its magnificent handle 😂

i wanted the hard way and you just...

City Labs 2.4 V model $4,500 Ea www.energy.gov/sites/prod/files/2015/08/f26/Cabauy%20Tritium%20Focus%20Group%20Presentation.pdf

Stay on the smart road. Follow the magic footprints.

32:54 He sounds like Elon Full of it and a bought and pay for audience.

A known fault on the early 80HC85 processor was a leakage current on the X1 crystal pin. The processor crystal oscillator was designed with its X1 input biased mid rail, with a small Schmitt hysteresis action around the mid voltage bias point. presumably to limit parasitic oscillation when driven with an external oscillator. Unfortunately the X1 suffered a leakage current that was sufficient to drive the oscillator outside the hysteresis window, this stopped the crystal from starting to oscillate. Sometimes switching the circuit off and on again provided a sufficient kick to allow the oscillator to start. Once started, the processor would run without a problem. The leakage current was temperature dependent, so diagnosing the fault took some time. The moral of the story is that PCB leakage currents can stop an oscillator from starting, if they get into the high impedance amplifier input. I have seen a guard ring track from the oscillator output used to protect such inputs from stray leakage currents. A problem that can be observed if the PCB is subject to dew point, where a film of condensation may form on the PCB, providing a path for such currents.

Some of the 32768 Hz circuits use the tiny 1uW crystals. These require a series resistor in the external crystal circuit to stop the crystal from over dissipating. Such over drive results in the crystal failing after a period of operation as the crystal breaks due to stress. This type of failure can happen after days, weeks, or even months of apparent successful continuous operation. A tip that may help determine if a crystal is close to over dissipation is to slightly increase the supply current to the chip containing the crystal oscillator amplifier. The frequency of an overdriven will fall slightly under such conditions, while the frequency of an under driven crystal will rise slightly. To reduce emi from the metal case of a crystal, it was common practice to loop a wire over the crystal case with both its ends soldered to ground. A cheaper, less satisfactory solution was to physically solder the crystal can to the PCB ground plane. This was bad practice, as the heat of soldering had the effect of permanently changing the crystal frequency. There was a version of the HC18U case that had a third wire welded to the top of the crystal can. This could be bent over and soldered down to PCB 0 volts, to ground the can of the crystal. It is surprising how much RF energy can be detected with a high impedance oscilloscope probe from the can of an ungrounded crystal. That which is not revealed by an oscilloscope probe, can often be detected using a search coil connected to a spectrum analyser.

You charged it up with a noisy power brick now the battery’s contain noisy energy

i have the 12.9 and the battery has never lasted 10 hrs. it is almost 2 yrs old and i might get 6 hrs

Am a technician from Nigeria, i need to learn new things, this are old I need new repair technique

Do you use LISN when measuring conducted EMI?

wow! what a great guy. brilliant episode

I think durability will be a major issue with these new iPads, they are just too thin for their size, even using expensive materials I still don’t think that would be enough considering that it will just be a thin shell on the outside. Resistance to bending increases the further away from the normal line you are and material that is further out contributes more to strength. Even just increasing it by a few mms you could increase the bending strength of the iPad and allow them to use thicker material further adding to strength. I would think that in a design this thin and light, the internal components are likely structural too and that with even the slightest bend the internal components will be under load. Which really isn’t good for durability.

The protruding camera is a huge bummer when trying to type on it while it lays flat on a table... So you will get a cover and you are back at a fat clunky plastic klotz.

It is just all sales gimmicks and advertising, the cluey DYI Bob would still pay less for a better product. However, I do appreciate your unbiased knowledge, it has enlightened me. A thumbs up from me.

Why is Lore teaching me how to make a PCB schematic??

If you really want to save fuel, don't use the brakes so much. Thank you for your educational video, it really showed how they designed/made these to fool.

I love LCSC. I use it for all my PCBA designs at work and at home. JLCPCB and ALLPCB make it very easy to source and assemble components from LCSC. I build most of my projects that I want assembled, or mostly assembled using strictly LCSC components when possible

So why not give us some suggestions on which one to buy?

@eevblog Perhaps it's more that that marketing is shrewd/clever - if you gave it an extra 50% battery life at the expense of 1mm, then the public response would be, why in the hell didn't you do that before? It would create a lot of work for marketing instead of just sending mandates to engineering, and would disrupt the wonder of making everything smaller, and put them in the trade off bin everyone else is in, thus they lose their Apple is magic, Apple is always #1 narrative explained in simple ways.

LOL... Hioki is a great brand... the Japanese usually do know how to make good quality electronics .... simple, efficient, accurate and well made !!! As far as the case: if it is an item that might get dropped often then some flex in the plastic is definitely desired and preferred for longevity !!!

Oooh, I’ll echo what many others are saying in the comments- I love any of these kinds of videos where you share your knowledge and experience with us! Thanks!

I looked this up after seeing a formulaic ad on KZfaq, which is almost identical to the ads for all sorts of other scams, and I'm not at all surprised to see that it's a complete fraud. What is surprising is that it's still going five years after this video (and no doubt others) exposed it. This means that there must be a number of people who never bother to look into devices like this before ordering them and coughing up the dosh. This also means that KZfaq have zero interest in stopping criminal fraudsters from advertising to the gullible and ignorant on their platform, which makes them knowing accessories and accomplices... so why aren't the regulators in the USA and the EU levying enormous fines against KZfaq for knowingly helping to defraud their users and viewers?

Thx dave

Very useful condensed material. Thanks Dave! And, for designers that actually need a crystal oscillator, remember that the value of the load capacitors is very important, if you want to achieve precision. A tip here (and I do not make any advertisement): use the latest version of Saturn PCB. It includes the Crystal Load Capacitors and PPM calculator. Cheers!

Can you do DT830D Multimeter review? Just for fun😉

For stable and safe operation of an XTAL oscillator, especially in a mass production and in a wider environmental temperature range, those standard 10, 20pF capacitors are undesirable, especially when built in a (digital type) oscillator circuit. "Analogue oscillators" are preferable, but digital design engineers usually don't have that knowledge any more. It's too costly, as well, to mix analogue and digital on a chip. We usually send our new oscillator circuits (inside an embedded controller) to our XTAL manufacturers, like NDK, Kyocera, murata, former Tele Quartz, now AXTAL, etc., requesting a specific center frequency and XTAL type / case. They then determine their manufacturing parameters (cutting, trimming, blank type) and determine the optimum C1, C2 values, including layout pattern. That gives optimum start-up time and best "oscillation margin". C1, C2 should always be external. Please search for documentation on "XTAL oscillation margin" for more details, as well, how one can measure these parameters on his own.

Some micro datasheets also specify the load capacitance range of the crystal. Use one even slightly outside of that range, even one stated to be the same frequency, and the micro will not start / run properly, irrespective of the value of the load capacitors.

11 years later and you have just saved an oscilloscope 😂

Nice! Thanks!

I really want to know, what do people think they're gaining from the devices being this thin. Laptops, phones, tablets... you name it. What device actually benefits considerably from being as thin as they're forcing nowadays? And where? The area they occupy is ever growing.

My apologies. My subscription should never have been cared about if it was; it was not intentional and probably the work if the cat or budgie when I fell asleep. I only needed the chopper circuit from you for the opa134 computer

YES give dave give us more , if not this channel on the 2nd chanel

Dave, I think these short design vblogs are great. It's nice having a range of articles to watch. Sometimes I have ten minutes to spare, other times I have a half hour. I get to choose from a buffet of excellence. Thanks

The big advantage of the thin design is that it bends really easily when you sit on it.

Battery balancing kicked in ?

What will be the thickness with the protective case?

One mm more? Thicker screen and back protection!

One year later, after the battery starts swelling it will be 6mm, 7mm?

Really good advice. It's so easy to use an oscillator and too many people try to design their own with a crystal and get into problems. Also, there are often designs with more than one crystal at one frequency where just one would do. For most crystals that aren't the 32.768 kHz "tuning fork" ones, the frequency in MHz is 1664 divided by the thickness in microns. That makes a 3.579545 MHz crystal nearly 0.5 mm thick. That may not sound a lot, but that sort of crystal (know as "AT cut") works best when it is much longer than its thickness. In an HC49/4 crystal, which is about 7 mm long, that means that the crystal has to be made thinner at the ends to make it work. There is also the risk that the crystal can oscillate at it's 3rd overtone, which would be about 10.5 MHz. Also the crystal in the low height HC49/4 has to be made as a narrow rectangle, not a circle or wide rectangle. In the narrow rectangle, the oscillations, which are minute physical movements, have to be near the edges, while in other shapes the oscillations are biggest in the centre and tail off towards the edges, so the edges aren't affecting the oscillation. For those reasons it makes a lot of sense for small crystals or oscillators to have a higher frequency oscillator, and to divide the frequency. That tiny packaged oscillator will probably have a 28.63 MHz crystal in it, which is divided by 8. That makes the crystal 58 µm thick, and if it's 2 mm long, it's around 40 times as long as it's thickness so that'll work better. It's not going to oscillate at the 3rd overtone which would be over 70 MHz as the amplifier won't have gain at that frequency. Two slight warnings. Some little oscillators don't have built-in decoupling capacitors, so I would suggest treating them like and IC and making sure that there's 10 nF or 100 nF across the power supply near to the oscillator. Secondly, the X2 output can be made with very low drive capability. A lot of oscillator circuits have a resistor between the output of the inverter and the crystal. That resistor can prevent unintended overtone oscillation, and mean that the crystal is driven with a more sinusoidal waveform. If that resistor is effectively built into the IC, then the drive capability will be worse if you're trying to drive any long wires.

Have all the electo geeks who did a video about these batteries all taken a class on how to make a stupid face?

I've always loved all your design related content. I really miss it. U barely do n e thing like the power supply design videos. Do more please!!!

It depends on where the light is on the transmission line relative to the switch/battery. If one places each Switch/Battery at one end, light at the other end, it takes as long as light takes.

A bit of criticism Dave, your soldering there is a bit crap.

Yep if I was INSANE enough to pay thousands for such a thing, it WILL sound fantastic to me, no matter how it REALLY sounds! :)

Fluke products are not made in the US. Warranty is 1 year or 3 years maximum.

1) NUTS to have the power pads so close to each other!, 2) That price is WAY WAY BEYOND INSANE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mosfets are tough, but there is 2N7000 & Si230x, AO3400 for starters. In spite of the "brand" numbers they are in fact made by MANY (mostly Asian) manufacturers! IRF3205 & IRFZ44 are runner ups, and YES multiple manufacturers like Vishay. The Si230x are used in SO MANY small devices,.

So awesome for the time, casio is a master, thank you for sharing such detailed video. I have the DBC-600 and the vdb-200 but this one shown is so cool.