Відео

I was looking at where the magic vent is located on the D628 (MT3608). Looks like it appears between Pin 1 and 2 on all the IC's that went for a smoking break. Probably where the internal MOSFET is located. One plan was to use this like you are for the op-amps

That is a nice idea. At this rate I have only 5 more tries (-:

Could the inductor be saturated while it is working by bringing a magnet close to it instead of applying heat?

The 22uF will be the next test, but at best these will only be useable at under 500mA. Main concern is "are these a fire hazard". Have a good day

Specs are for the chip and in most websites the output current 2A is listed. I started with 10 modules and now down to 5 (-:. Most likely the B628 does not have the same specs as the MT3608 which it is being substituted. Plan on more smoke testing, I mean I mean current testing (-:

Have an assortment of SMD inductors and might try varying the value. Suspect I will smoke more of these before I am done.

(-: (-: Visited a friend many years ago who was complaining about mice. She could hear them. Nope not a leak detector, was the smoke alarm (-:

The project I have for these will be 200 to 500ma at 18V plus some 12V at similar mAs. I figured these were overrated, but was hoping for 18V at 750mA ish as a safety margin. Big concern I have now is it burned to easy.

I have some 22uF SMD so will try that a bit later and see what happens. $0.38 per puff, I can live with that. Don't have any real MT3806's so, can't try replacing those yet. Have a good day

@@retireeelectronics2649 Yeah they are pretty cheap. I can understand you don't care if you blow one up :)

In this case for the Maximum rating they probably used someone else's data sheet. The efficiency curve for 13Vin and 18V out graph shows 1.7 amps. They were a bit optimistic for their product since it failed much earlier.

@retireeelectronics2649 - yeah, the copy of datasheet is obviously photoshopped - they didn't even match the font when they replaced "MT3608" with "SBD628" 😮

@@johncoops6897 I thought that was funny with the mismatch Font (-:

It was interesting how it stayed cool when I ramped up the current draw, then went smoky real fast. I agree, that using these in the lower current area is a much better idea.

some circuits need several voltages

At roughly $0.38 each can't expect a lot. But the fact it burned and kept burning is very poor.

@@jyvben1520 that's why you design the psu chip to provide the voltage it needs for each part. these one design does all will never work. and the components shown on the datasheet are the minimum needed to get it to work. not to work over every condition you throw at it.

@@retireeelectronics2649 well if the inductor is not tot the required spec then switching currents will most likely be out of spec for the chip to handle.

Will try another inductor in the future but at the rate I am cooking these I have only 5 more chances (-:

I always have a fire extinguisher sitting near the door. Where I worked last we all got a fire fighting course, 5 pounder vs gasoline fire, neat course. They stressed, everything in the building is replaceable, hence get out and never let the fire get between you and the exit.

Failing was bad enough, but to keep burning was very poor. Probably not top quality for the price. Have a good day.

@@retireeelectronics2649 100% agree. in some ways these could be a safety issue could end up burning your bloody house down :( not good really lol.

The sheet states pin 2 (GND) is important heat sink. Very tiny heat sink even when coupled to the other side. Also the sheet indicates soft start and thermal shutdown at 155C. None of the modules worked after failing, even the ones that didn't smoke.

Not sure the the right capacitor size would help. An inrush resistor might be more in order.

I'm proud to still possess all my fingers, and at least some feeling in most of them. There have been some close calls.

Have a few items on my list before a FLIR camera, anyway the price keeps coming down or resolution up. My wife wonders how I can handle hot items so easily, I just say "I solder"

@@retireeelectronics2649 Ÿes, well, I have some problems in my nerves too since long but after soldering and desoldering for a while, not only do I not feel the temperatures but also almost or no pain before I smell my skin getting white. After a 'soldering-holiday', first days is quite painfull and then I am more likely to use some tools to hold. For getting more acurate temperature-measurements, I also like to use a K-thermocouple on a cheap multimeter like 'we' all had in the days. For just getting a bit like ' heat camera', there are small sensors to combine with a smartphone or computer. I want to test those first before I will invest in a real flir. I have a small one from Ali that is very low in resolution and gives some indication about where it is getting hot so I can measure on those points with the thermocouple.

@@retireeelectronics2649 There are good cameras out there for about 100 $ which fits on the phone USB-C. Not that big deal anymore.

If this was used for that purpose then it would be perfect. The battery would be dead fairly quickly then it would look like a real security camera (-:

Your right, both state forehead, dam I should read the manual. Previously I had one that had a protrusion and it was designed for the ear. Taking a reading of the ear apparently is more accurate (pick high number) but a bit more fluctuating. Good catch

I have had 11 bad orders over 4 years. 5 were refunded since never delivered, plus 1 batch of garbage capacitors, plus 4 fake products that I figured were fake to start with, hence didn't care about refund. And now a empty box. I am actually very happy with the results. The fake Geiger counter thou was a touch pricey but I had expected it to be questionable.

Probably steel, plated with something. They are making the nickels, dimes and quarters in Canada as cheap as possible.

They say, if you don't have a hobby when you retire, your life span will be greatly shortened. And it also keeps the mind active (-:

@retireeelectronics2649 that's true! You really must to keep busy yourself with something because increases also the mental health and the life will be not boring to!

@retireeelectronics2649 why you don't make a project building an audio amplifier people like amplifiers and definitely you will gain more subscribers and views

@@SymbolTech21 That will be coming after I work on the Theremins, plus a few other noise makers

Maybe my next video will be deep frying these converters. Have lots to test with (-:

@@retireeelectronics2649 Make sure the camera is on when the smoke comes out!

Oh the smoke and flames came out in my video on these. And the camera was not on for the first one )-:

Nope, but I am going to get some. Hot glue is great but it tends not to fill gaps. Also I plan on doing some artsy type stuff with resin and this light is very strong.

It will be interesting to see how this dosimeter compares to other 3 brands I got at that auction. It was amazing how much shielding there was but probably to be expected since the company was targeting military contracts.

The big one locked up my phone so, definitely noisy. But then with all the switching power supplies around it probably just blends in. When I started electronics the most significant noise was 60Hz from the house wiring, times have changed. Have a good day

If you haven't seen my other video "Radiation Dosimeters and more" (September 2024) you will see how big of a haul I got from the government. Picked up some Silicon Photo Diodes in a mailbag a while ago and eventually want to build my own . Long term project.

@@retireeelectronics2649 Thank you, i'll look them up

Thanks, I just find these amazing and can waste a lot of time playing with them.

They definitely made that with no serviceable parts (-:

These are going to be for an Alpha particle detector (-: and other projects of course

Have had a few copper, cough cough wires stick to the magnet (-:

Good idea. A few decades ago I worked with a person that installed hidden cameras for catching inside vandalism. After that I just assume there was a camera everywhere. When you can install a camera inside a smoke detector or radio and there is no way a person can see it. Humm we are being monitored. Have a good day

No No, not 3 actually 4 (-: ISD1820 = 1 Mailbag 41 Watches = 1 Mailbag 40 UV cards, breadboards,0.12mm wire = 1 Mailbag 40 Solid copper wire, two bags but 1 order Mailbag 41 The BNCs and dome were a very old order August Now that it is the rainy season, I have lots of time for projects, and OAS (old age security payments) and CPP (Canadian Pension Plan payments) mean lots to spend on the hobby (-: (-:

@@retireeelectronics2649 very nice!

Yes and lots of time now that it is the rainy windy season. Which reminds me I need to build a small heater with thermostat for the new water shut-off valve located at the water meter. We do get the snow here occasionally. Have a good day

@@retireeelectronics2649 you can do with PTC are efficient

Plan on using a W1209 Thermostat module, luckily we only get a 3-4 weeks of below 0C. I figure if I gave the hummingbirds their own feeder heater, I might want to protect my water supply.

Lets see, have some RCWL-0516 microwave modules, HC-SR501 PIR modules, ISB1820 voice modules and a strong dislike of door to door canvassing (-:

And it is nice to keep it out of the landfill

I think we have all done that one, forgetting to put the sleeve on first. Forgot to mention in the video, once everything tests fine, I put a small dab of 5 minute epoxy between the wiring in the connector, that way no matter how much it is twisted the wires can never short together. Does make a one time fix thou.

That was a Canadian tragedy.

Comes down usually to $$. It is like comparing machined dip sockets to the stamped metal sockets, huge difference in quality. Have a good day

Was thinking of picking up some DMG swabs so I could test both the cheap and the old strips for nickel plating. Have a good day

Was trying to hand wind the toroidal with 0.06mm wire. Wire would tend to twist and form a kink that would easily break. Might have better results if I put the wire under tension then gently heated it to make it less likely to curl. Will practice with the 0.12mm then if I get better at it then try the 0.06mm again.

Yes, Li-ion batteries have a very long history of issues. In Canada Li-ion batteries can not be shipped by Canada Post unless enclosed within a device that uses it. Might be why I have been looking for cheap AliExpress items that contain Li-ion batteries (-: Have had zero luck finding discarded puffer devices

They have had a less volatile technology for a long time. It is LiFePO4... do some research 😉

I have had mixed results with the breadboards. First problem is that resistor leads are a lot thinner now, old was significantly thicker. So using old stock then the new stuff the holes can be loose. Unrelated to the breadboards is premade jumpers or alligators that have just friction fit between the wire and the pin/alligator. Major point of failure and I had to go through all of mine and solder these. Less failures after that. Have a good day

@@retireeelectronics2649 Yes so I bought a more expensive bread board module from Jameco in the US and pulled them apart. This is what I found: The cheap Chinese bread boards use strips of metal that is not springy brass but some other inferior metal and they are already opened wider than the diameter of those metal film resistors. The proper bread boards have plated brass strips that will hold on to thin wires and after putting a thick wire in them will spring back and still work with thin wires. Not so with the cheap Chinese boards. It is like use them once and then discard them?

Good idea. I should take one apart and compare it to my Niche 206 breadboard that I think is pushing 30+ years old.

(-: (-: Some company brand names just don't translate well or someone was having fun.

So true, somehow loading their software onto my smart phone could create a dumb phone real fast. I will pass on that. Funny thing is, I never wear a watch, and not about to start. (-:

Yes, and the battery appears to have the charge discharge protection built into it. Was able to gently get a view under the Kapton tape.

@@retireeelectronics2649 Usually the ones with Kapton tape have protection. But it's good to always check!

Interesting. Thank You Dustin. 👍

@@jlucasound YW

@@retireeelectronics2649 Another indicator is a small thin PCB.

It actually makes good sense for fuses, otherwise a strip of aluminum foil gets wrapped around it, not recommended. I can see the extra battery in a Swag item since the company wants it to last for advertising purposes.