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Not sure if you've already solved the mystery of the melted battery wires, but my suspicion is that the Red / Black leads **might** have been reversed in polarity. This would cause a short circuit through the body diode of your MOSFETs and draw significant current. The melting solder most likely saved your board! :D Edit: Yep, you figured it out... 👍

Nice! I always forget about giving that a try!

Thanks for your effort.

Very nice! I have a 270-5 Roll top case meter, and it is my go to for aircraft maintenance when I need something I know is solid!

This looks like it's going to be a fun series.

Nice video,thanks:)

Awesome ! I thoroughly enjoyed the load project and I look forward to this one.

i put 1 in my Counter with a 2.5V reference voltage to a trim pot works good!

Some decent stuff !!

I'm wondering if a clear red LED would power a SCR (LASCR) ? I saw a video on using a resistor to activate a switch by applying heat to it. but the led switch sounds saver but lighting a flashlight with a bic lighter still sounds intriguing!

iSesame not iSesamo. Think "Open Sesame" from your childhood.

Thanks for the informative spudger information. Looking forward to you reviews of the FNIRISI products.

This is what I used for my first solar tracker project, about 25 years ago :) .

With all this cable porn you could end up with a TH-cam strike.

Isesame as in Open Says me!

1.5 volts is about the same amount of energy as what is in a AA Battery. Enough to power a small flashlight.

Delivered to your door from China without tax! You gotta love that kinda deal.

I get vicarious pleasure from watching you open up and check out the toys. Then if I really need one of them I buy it. So far you've saved me a lot of money and I've picked up a few very useful devices. Thanks.

Arg. Looks like TH-cam deleted my comment on mail delivery. I think I mentioned a courier's name. Maybe that's why. I've got a couple dozen orders tied up in the strike and only 2 made it through using the sister company of CPC. First I've seen them used for items from china.

Isn't the hook on the opener just their logo?

are you an electrical engineer? how do you know a lot?

@Uni-Byte Metric System is THE Standard system of measurement in the "Rest" of the world. So if US system has been all "Messed" up, please don't call is "Weird"

Your Mail service delays will probably still be quicker than the royal mail delivery times in the UK !

Cosmetic mods. WHAT THIS THIS THING NEEDS is inputs protection, self tested cap discharging before test. AND YOUR CAMERA IS TOO FAR away from tge product, can hardly see any details

UK Post Office won't accept any mail going to Canada at the moment.

Amplifying a trianglular waveform doesn't give you the squarewave back. Amplification is not the solution to the problem of the input square wave being rounded as it passes through the opto isolator.

The pwm able pin of arduino does not do all that ? If if does, it is possible to use one as frequency genarator ?

😀😘

When driven reverse biased like a Zener diode, LEDs make good white noise sources too. I once built an RX noise bridge for antenna analysis and none of the Zeners in the junk box were really suitable, but the LED produced more RF noise than any of them. Some were noisier than others, and breakdown voltage depends on color.

Well fundamentally every diode is a photodiode - until we pack it in black epoxy or a metal can. We just optimize diodes wildly differently for different applications.

Another neat thing is apply power to a solar panel and it will emit infrared light.

You might be amazed to know, that if you connect a couple back to back and shine VERY bright light at the junction (green laser pointer ?), you can get enough power out to dimly light a highly efficient LED connected over it.

Well, for quite some years I've had a cheap universal remote with one LED. I thought it can't be of the learning type. But it is! It's cheaper to manufacture learning remote with just an IR LED than with the LED and photodiode/transistor. And you said red is better... IR even better, I presume.

You must be near me in central Ontario, same weather here too.

Do you accept commissions?

Yes I knew that… but I am an electronics technician so figure

What if the red led was wired to detect a variable frequency pulsed red laser led beam...?.. and then the same red led with a green laser beam...and..compare their sensitivity..?

I've known this as the Mims effect since Forrest Mims has done so much work with it.

i purchased one 3 years ago I have never used it just two or three times ....today I turn on the unit and the display is faulty, you can see horizontal lines and distorted characters... can these replacement displays be found? I was unsuccesful to find on web their factory website in order to ask them via email no support!!

i purchased one 3 years ago I have never used it just two or three times ....today I turn on the unit and the display is faulty, you can see horizontal lines and distorted characters... can these replacement displays be found? I don't find their factory site web in order to ask them via email

Fun fact, InGaN photovoltaic cells are about 2x more efficient than silicon. That is 400w/m²! Of course... the price is nowhere near Si... even NASA considers them expensive and go for the much cheaper and slightly less efficient GaAs cells. Leds are not very good as photovoltaics as they have microscopic InGaN chips that produce microscopic levels of power. Also, all photovoltaic cells and panels are LEDs. Just put power in and light comes out. Around 800nm for regular Si.

All semiconductors do that. You can glitch and even possibly damage entire chips by blasting them with bright pulse of light, like camera flash for example.

Is there likely to be an issue because the battery you added now has an IC pressed onto it. Would the IC get warm because there is no air around it?

ATTENTION. ONLY FOR NERDS: So actually all of the people here 😉To better understand why this happens search google with keywords "photovoltaic LED" and "Electroluminescence". Fun fact: it works best if the wavelength of both diodes are close to each other. But thanks Uni-Byte for a fun video and in my opinion a very educational video for other people. Cheers!

Now I know what the term "capacitor dropper" means. Thanks for sharing.

That was great, I would love to see some practical applications for this low current supply. I have no electronics knowledge to speak of but I am learning, very slowly. Thanks for sharing.

Simple little videos like this are fine and may move some viewers to experiment. Stay safe. John, k0ebc

Interesting video idea, compare the linearity (could hopefully do that with a sine wave of appropriate amplitude+offset for the device, and whatever your best FFT SA is), and transition times (effective bandwidth) of some different optoisolating designs - a traditional optoisolator (transistor based) in a package (e.g pc317 type things), a LDR based one (led potted to an LDR resistor), and your design here, LED to LED. For extra credits, how well a simple transistor based binary amplifier can clean them up *for a digital protocol. And hopefully no new parts would be required for that idea xD

How fast/good are those LED as a light sensor for a light curtain if a laser from a laser curtain setup shines on them. Could you make further video about this topic?

Tell me about it. I have 20 parcels in limbo, and some of them are fairly expensive. But with an aggressive union demanding a shocking 24% pay increase, from a struggling company on the brink of bankruptcy, and a government not wanting to be involved ... we may be waiting for quite a while. And I have to tell you, Canada Post is horribly unreliable even when they are working. Several years ago, I was buying lots of stuff that had 'free shipping', until all of a sudden without any warning, stuff just stopped arriving. 25 parcels or so simply vanished. More recently, at the beginning of the year, 5 or 6 parcels using the untracked AliExpress 'Saver Shipping' similarly vanished. I can't say for sure, but everything points someone inside Canada Post just dumping the stuff. Now I only use the AliExpress 'Choice Shipping' which is a 'tracked' service. For what-ever reason, this stuff always seems to get through ... except for now of course, while they are all on strike. Good idea using LEDs as opto-isolators. I'll have to give it a try.