Julian's Electronics Postbag

[@Leif_YT]

From a listing of the K-300 glue. Set Time(s) = 10s/4mW/cm²UVA and Cure Time(s) = 180s/4mW/cm²UVA

[@brendethedev2858]

Im so glad to see you uploading so much again! this has always been my favorite channel! you're experienced but you're not by and means slow which makes these videos so entertaining.

[@helmuthschultes9243]

Curing the UV glue is also influenced by the wavelength. Many of the UV torches are closer to 400nm ao rather more deep violet than ultra violet. Around 360nm works faster, even shorter is better still. The exposure time to cure the glue will be sugnifucantly longer for the long wavelengths. I found closer to 3 to 5 min for good curing. Intensity is less effective than shorter wavelengths!

[@samesdee4655]

Very helpful info! Been looking for quite some time to locate what wavelengths of UV are most effective/efficient at curing. Seems as though the manufactures of UV glue would publish the wavelength that is best for their particular formulation. Thank you Helmuth!

[@CollinBaillie]

I have read that distance from the glue also plays a big part. Recommended 3-5mm from the glue.

[@helmuthschultes9243]

Yes my message also stated 3 to 5, for some reason it was type/spell converted to "min" where I had wanted "mm", so that agrees to my former comment as best distance light to glue

[@incorporeal3793]

" Shake the bottle, shake the bottle, shake the f..ah, finally he shook the bottle!" 🤭

[@lint2023]

Put the cap back on. Put the cap back on. Put the .. 😄

[@TheEmbeddedHobbyist]

Hi Julian, is the i2C signals referenced to the gnd input, i can't see a digital ground. so not sure how they will communicate over I2C if the grounds are all at different potentials and you try and connect all the i2c lines to a mux?

[@note3958]

i got some of the same glue from aliexpress,its only 2.99$ i also got some 3w leds at 395nm and they work really good.

[@ElmerFuddGun]

10:53 Noooooo! Bad idea only putting a small hole in the seal. Now when it starts to get close to empty you will have to have it perfectly level and it will be more likely to spit out as you squeeze the bottle. Removing the complete seal allows the bottle to be at an angle and allows better flow. Think about it. And if you ever want to put the flat cap back on you'll get glue all over the place as there will still be glue in the funnel. Next time just cut it with your snap blade knife on the inside edge.

[@muh1h1]

"Next time" as in "when you have used up that bottle and start a new one" which is probably "in 15 years" :D

[@ElmerFuddGun]

@@muh1h1 - Perhaps but since Julian likes to use it as a conformal coating for his charge controllers I don't think it will last that long. At least he isn't using those tiny little "sample" size tubes!

[@sdgelectronics]

I found that glue needs around 2 minutes with one of those powerful UV torches. Not quite how it's advertised...

[@TheEmbeddedHobbyist]

dito, the little torch did not do too well. got a higher powered UV tube for a fish tank might give it a try.

[@voltlog]

We also don't know if the wavelength of these flashlights is what the glue needs.

[@benbaselet2026]

@@voltlog I have seen claims of 220-260nm wavelength for this stuff so you'd need definitely something else than an LED for that.

[@Ghlargh]

Usually the UV adhesive you get in those large bottles is for joining a cellphone front glass to the touch sensor. It won't surface harden which means it will be sticky, it also won't go completely rock hard. What you want is UV cured "No wipe top coat" for nail art. That stuff hardens fully and leaves a dry surface. That said, all the ads that show people joining things like two screws end to end or repairing eyeglass frames are basically scams. UV adhesive is good for covering sensitive things (SMD LEDs on a PCB people are supposed to touch for example) or joining large transparent surfaces together (screen and touch sensor as above).

[@EsotericArctos]

Looks like the UV isn't penetrating through to the centre of the bolt. Maybe just bold.doesn't let light through it 🙂. Looks like it works though. A good shake will fix many things.

[@captainboing]

For the UV curing glue, I use a UV nail arch like used in nail bars to set the gels. Just put it in there and it gets saturated with UV for a controlled time

[@fiskurtjorn]

Bought a bottle too. I got a decent manual with it. The glue is for glass, and at least one of the glued parts needs to be transparent. Waterproofing electronics is a bit of a gamble i find. I use that big yellow-ish UV-gun outside.

[@josephnealescratchcards]

another great postbag opening on video as always

[@petehiggins33]

I think that what you missed with the UV glue advert is that they left a gap between the bolts so that the UV could penetrate and cure the whole volume of the glue. And they probably also edited out some of the curing time to make it look faster.

[@kirkb4989]

4 unique addresses with two settable address bits (A0 and A1): 00 01 10 11 so you can add 0, 1, 2 or 3 to the base address depending on how you connect the A0 and A1 bits (or not).

[@lunokhodtoy]

To get other addresses you need to connect A0/A1 to SCL/SDA.

[@kirkb4989]

@@lunokhodtoy I've never heard of that before. Are you sure? I think that would allow you to change the address of the module within the 4 address range dynamically but I don't understand how that would get you any other addresses. But I'm willing to learn!

[@lunokhodtoy]

@@kirkb4989 it is from datasheet, there multiple options to connect to, not just VSS and GND, it is new for me too :)

[@JohnKnutsson]

Link to UV torch? Thanks in advance! Looking forward to next video!

[@MikesAllotment]

I know it's been a long time since this video, and I also know that you made power meters using the INA219 module, but did you ever do anything with these INA226 modules? I've used INA219 modules before, but they are limited to max 3A current - which is why I guess you went for the INA226 instead as I believe they can handle higher current? Interested to hear what you did with them....

[@isoguy.]

Love your channel but 4 ads and a shout out for jlc in a 16 minute vid just makes it really annoying Thanks for sharing 👍👍👍

[@Mark1024MAK]

An advertisement right in the middle of you going through the eBay listing was *REALLY* annoying grrrr 😡

[@callumBee]

Adblock ;) Until the internet gets its act together and does reasonable ads then Adblock will be used.

[@JulianIlett]

That's how KZbin is these days - watch me on LBRY if you don't like ads

[@tomgeorge3726]

The R010 resistor looks like a SMD version of a ceramic power resistor. If your cells are in series, will you be able to connect all the I2C comms together? You may need a I2C isolator. How will you power them, is gnd on the output terminal strip connected to gnd on the battery measurement side? You need to draw a schematic and check your potential difference logic. The UV glue, because you are trying to use it like a filler, may need more time to penetrate. The pens dispense a thinner/less viscous liquid.

[@cheetahkid]

I probably point your way, I would believe because the ground is the only fixed point, I would just use one of 226 and the other I would go for ADS1115 (there are 4 voltage reading).

[@TheEmbeddedHobbyist]

Thinking that if you only care about current, connect the grounds together. then the I2C will all be at the same 0V so should be ok. As long as the battery voltage does not exceed 36V it might work. might work, might let out some magic smoke. But thats where the fun is.

[@ParedCheese]

I was surprised at how exothermic the setting reaction is. It gets quite hot!

[@CollinBaillie]

It would be interesting to see a comparison of the other grades (302 and 303) they make, along with other makers. On our favourite eastern market place, there are brand like Locttlf (looks like a loctite knock off brand), visbella, lazerbond, and then there are "UV Resins" which are labelled as "hard" and "soft" (usually featured being used to fabricate jewellery) If you want to experiment to find a bull alternative which works really well, or you're looking for a showdown type video, this might be interesting.

[@joeyfren1748]

Could you use standoffs for stacking those circuits?

[@deslomeslager]

Let me know if you solve the K300 problem. I bought 2 bottles in 2019 (after seeing you glue your pcb's). No matter how much UV light I shine at it, it never gets solid. Even tried several frequencies and intensities of UV (sunlight of course as well). Shaking the bottle did not help either. I now have two of those bottles laying in my drawer. Getting old. So please find out how to use it as 'glue' because currently it is just a sticky liquid. Note: my real intention was to glue solar panels from Ali, to make them more rigid (those very thin ones, you know them? Just micrometers thick). But the glue never dried, so that was the end of a failed project.

[@melkiorwiseman5234]

Here's an experiement to try: Leave it in the sun for an hour and see if that does the job.

[@deslomeslager]

@@melkiorwiseman5234 Yes, I know. And tried. I think it was a faulty batch. PS: currently it is winter, and there is not much sun right now.

[@benbaselet2026]

I've seen quotes where it needs 220-260nm wavelength. If that is correct you might be able to do it with an expensive LED but probably some germicidal tube like pulsed xenon (works wonders on erasing old ROMs BTW).

[@melkiorwiseman5234]

@@deslomeslager Based on that information, I think you may be correct and it was a bad (or just sub-standard) batch.

[@melkiorwiseman5234]

@@benbaselet2026 The main problem with using short UV is that you need to shield it so living things aren't exposed. It's especially bad for the eyes.

[@davestech6357]

I have a led streamlight flashlight and the filter on the led came off. The light is bluish purple, do you think it is ultraviolet too? I am sure you have some lights lying around you can modify and try?

[@IncertusetNescio]

Anyone know where you can get those non-solder/weld battery pack holders or the keywords?

[@whitehoose]

I set mine with a 50 led 240v lamp - I've been using what looks like similar stuff. First time I used it I thought it was rubbish. My usual glue comes in 10ml bottles and only takes a couple of seconds to cure, this new potion wouldn't set = After a bit of playing I found it takes considerably longer but to be fair sets much harder/stronger and without the sticky residue but we're talking 5+ minutes. Longer to be safe.

[@tanjiro3285]

Nicely explained ❤

[@AllLoudNation365]

Ooo bigclive style! Lots if displays and readouts!!

Try the INA2xx library. It is designed to scan the I2C buss for INA219/226/3221 ICs and read them all from a single command.

[@chrisw1462]

Current monitor I2C address... Four addresses.. 00, 01, 10, 11. But you can always use another two data lines for a soft I2C line.

[@deathshaker0026]

Ya I ordered that same UV glue last year and had the same problem.

[@flagpoleeip]

I think the delivery dates are if you ordered them now.

[@christianharris2158]

have you had any problems with post from china?? ive not received any in weeks now.

[@nabilandadamslaboratory3422]

Sorry I didn't get what's different between the IN219 and the INA226.

[@TheWareek]

there are nuclear reactors with less wiring and monitoring, than your battery pack.

[@frankowalker4662]

Igor, More light!!! More glue!!!

[@robertcromwell9736]

Can those things have 5 different I2C addresses?

[@pileofstuff]

I'm not sure it can with the pads that are broken out. Maybe there are additional address pins on the chip that can be accessed via bodge wire?

[@DavidGranz]

e2e.ti.com/support/amplifiers/f/14/t/811151?INA219-I2C-Address

[@pileofstuff]

@@DavidGranz Wow, that's an unexpected addressing method.

[@DavidGranz]

I should add that while the INA219 does support strapping for 16 addresses, the breakout boards do not easily allow more than 4 addresses. It's possible to strap to the other addresses, but resistors will need to be removed from the A0/A1 lines and patch wires added. It may be easier to use a I2C multiplexer

[@weirdboyjim]

2020 project theme is "Fits on desk"? I messed up bad boss!

[@JulianIlett]

You've probably got a bigger desk :)

[@ricininepartypillz9248]

A KZbinr called 'Sorin-DIY Electrical Nerd' made something similar using that BMI you showed first

[@urugulu1656]

you know that measuring voltage and current at the same time can quite drastically screw up your readings? do you

[@TristanGomez]

I also just recently played with the INA226 (because the INA219 was sold out in my local electronics shops) :) I personally use the github.com/SV-Zanshin/INA library. I wanted to ask, is there any reason why you chose the INA226 over the INA219 ?

[@justinkoldenhof9039]

The uv glue is available in 2 types soft and hard they could have send the wrong type

[@jobit_joseph]

Beware of Chinese INA226 modules , won't get accurate voltage readings with default LSB value. You may need to manualy measure the voltage , calculate LSB based on corresponding ADC value, average out and add this LSB value in the code . Current measurements on the other hand is pretty accurate up to mA.

[@pdrg]

If you can set A0 and A1, would those only be the two lowest bits, so 4 addresses?

[@DavidGranz]

TI used sort of a trick to allow up to 16 addresses... it's described here: e2e.ti.com/support/amplifiers/f/14/t/811151?INA219-I2C-Address

[@DavidGranz]

I should add that while the INA219 does support strapping for 16 addresses, the breakout boards do not easily allow more than 4 addresses. It's possible to strap to the other addresses, but resistors will need to be removed from the A0/A1 lines and patch wires added. It may be easier to use a I2C multiplexer.

[@originalmianos]

Got the same glue. I have a range of UV source wavelengths. It is uselessly weak. I have seen watchmakers use some type that works. If anyone knows one that works I'd love to know.

[@pleasecho2]

Those active balancers work but don't expect each cell to be precisely the same

[@RicardoPenders]

Why does it take you so long to finish the vocoder? Is the vocoder working already? And what does the vocoder really do? I'm struggling to keep interested in the thing, how long are you working on it about a year or so? Maybe it's better to work on your annual projects in the background and when it's finished you show one video of the complete process because it is taking way too much time.

[@benbaselet2026]

Did Julian ever finish anything? That's not what we come here for :-D

[@FG-Supercharged]

The UV glue should not really be used as a glue, it's more like an epoxy. You would use it to cover things, say as an insulator or conformal coating, or else create things, like trinkets, by using it with a mold. As a glue it really is weak as you found out. It also often needs to be cleaned on the outside with IPA and then left in the sun for a few hours to fully cure. But for what it does, and how it does it, it really can be quite convenient and useful.

[@johnflower8648]

Instead of UV glue try using super glue and baking soda.

[@Anvilshock]

What's so special about those "general purpose" transistors?

[@Mark1024MAK]

BC182L were a favourite of one of the contributors to the magazine that the Vocoder was published in. A lot of projects by the same author used them. Any suitable general purpose small signal NPN transistor can be used to replace them in most designs as long as you take account of the lead-out. And keep in mind that the same transistor was/is available without the L suffix but it has a different lead-out.

[@House0fwax]

Those transistors are BC182 'L' ,Beware the pin-out.

[@JulianIlett]

Ah ok, I'll check that

[@Mark1024MAK]

Yeah, they are available in two different lead-out packages.

[@maicod]

the spiders were lucky the pack wasn't Live ;-)

[@sazman2000]

oi oi julian , post bag time , wooo

[@weerobot]

Safety Glasses..!!!

[@tisrettamton153]

Pronouncing the last sellers name reminded of Jerry Lewis doing LAAAADY!

[@gcewing]

Maybe the terrible music is needed to make the glue set?

[@melikrasniqi1511]

Are you wearing a mask? (Coronaasliexpress) 😂😂😂

[@davey2k12]

Your lights am interfering with the crap UV LEDs 😀 It's bit funny really what if the light can't penetrate all the glue think it's used for gluing transparent materials lol

[@lunokhodtoy]

16 Programmable Addresses

Alas this board only support 4 addreses, without cutting traces. To get other addresses you need to connect A0/A1 to SCL/SDA. This board has an pull down resistor on A0/A1, which would interfere with the I2C pull up resistors...

[@lunokhodtoy]

@ yes, I did check only chip specifications

@DIY Projects just look at the board. The IC supper 16 different addreses, but A0/A1 jumper pads have only 4 posible states.

@DIY Projects yes, the IC can be configured to 16 different addresses, but as I wrote before this board can only have 4 of the 16 without cutting some traces (or removing some resistors) On this board, the A0 and A1 pins have 10k pulldown resistors. If A0/A1 are connected to Vcc, the pulldown resistors do nothing more than wasting a bit of power. However if A0/A1 are connected to SDA/SCL the pulldown resistors interfere with the pullup resistors of the I2C bus. That is why this board can only have 4 different addresses without cutting the pulldown traces or removing the pulldown resistors.

[@CursedMining]

Heyho! I just found you as you subscribed to my channel and I am glad you did! You cover a lot of stuff I am very interested in (LED nerd here too =D ). Cheers and thanks!!

[@JulianIlett]

Yeah, I'm really interested in the mining hardware, especially now you can buy them at silly low prices :)

[@ollieb9875]

postbaaaaaag!

[@LegacyMicro]

Didn't get the UV glue ad. That would have been great. Instead I get anti-gun political ads. Geesh!

[@brianhanson9367]

No....you have many more ads than is usual.

[@markflack9191]

i do not get youtube adverts. i have premium.

[@JulianIlett]

Probably wise - some of the adverts are quite annoying :)

[@tomgeorge3726]

I don't get KZbin ads, I have Adblocker.

[@sdgelectronics]

@@tomgeorge3726 Support the content creators!

[@TheKetsa]

Yes, UV glue sucks !

[@pdrg]

Omg that's the stinkiest glue, smells of cancer, quite thin when I bought it. Just as useless too by the look of it.