Projects and experiments in physics, electronics, mechatronics/machines, software, instruments and tools, crafts, woodworking and metalworking.
I mainly show things that I make (or have made) and tips from my experience. So this channel is kind of a video blog.
I have a long experience in designing electronic devices, machines, and in particular software and firmware development for embedded systems.
Also see my site/blog AccidentalScience.com where I put articles, often related to the video published in this channel.
This channel started with documentaries, that I almost no longer make, and are collected in a specific playlist.
While I'll try to upload videos approximately once every 15 days or less, actually this will happens as the videos will become available, so I recommend you to subscribe and click the bell icon to get notified when new videos are available.
I am not a native English speaker, however my videos are in English for people from all over the Europe, and beyond.
Пікірлер
Can you send me your blue Prince
And a material list
Non c'è una versione in italiano?
Sorry at the moment it's not available. Maybe I'll do something sooner or later. Mi dispiace al momento non disponibile. Forse fraro' qualche cosa presto o tardi.
Very nice video, but I have to disagree with you on your shift/offset method. The same curvature could exist with each shift.
Well done ,
In the first version it may be intersting to change the BC337 for an opamp led drive. The leds goes in the feedback loop of one non inverting opamp. With this configuration the leds turns on gradually from zero.
the reason you have to turn down your inverter is because it has to sync to the sine wave on the grid and with grid down it has no way to sync
16:40 - I think you came up with quite an elegant solution for the problem. It would greatly reduce the possible errors in the flat surface and the results would be more than suitable for a lathe or similar project.
So your this velog has been on diagrams of highspeed Sine Wave inverters design and working. Thank you.
A hand drawn PCB. It`s been a long time, and that drew some memories. Thank you. Also, this was a good reminder that you can still build something quickly and with components out of the jar.
Exactly you got the point. 💙 Thanks for commenting and greetings from the Alps.
Wonder how to do this same thing BUT without schematic? Watch this video too: kzread.info/dash/bejne/q56s16-wfLGdqqw.html
Circuit is pronounced sir-kit, not sir-ku-it.
Thank you for sharing all these information with us
Thank you, good job!
Glad it was helpful!
So, my idea to use two orbital sander where two plates attached together to the sander might be plausible.🤔
so basically make a differential probe instead of buying one hehe
How can I remove the speed on it ?
What do you mean?
I have one like the one you have but the one I have doesn't have braces
Burnt board is beyond repair. Indian serviceman: hold my beer!
Woao!!! What a beautiful job. Congratulations Man!!!
Someone stealing electricity the sneaky way “wave clipping”.
Ugh - the awful cringe thumbnails have invaded even the electronics channels. It is just so gross, have dignity man.
I acknowledge your concern. It was meant as kinda joke, but I overestimated my ability to communicate it was a joke. I apologize. So I have replaced the thumbnail with something that I hope is better both at attracting people and to be felt less "awful cringe". Thanks for the feedback.
1:00 Broken solder joint .... or cracked circuit board.
If those were RIFA capacitors, you better replace them. They tend to self-combust after 30 years or so.
Hi Bob, good catch!
I have never done this , I read several sites to find out how to do it, then I came here and learned 10x more than all the others in only 10 min so thank you!
I wonder what to do in the situation faced by me? The two Neutrals from the two outputs 230 VAC of the Nitrox Inverter ( 3 KW - 24 V, SP - Hybrid _ by A.P.T. ) aren't allowed to be jointed! At my home the PE and the Neutral are NOT jointed! Neither the Solar Panels nor the Inverter is Grounded till now! The Inverter demands the two Neutrals to be isolated and afloat! I'm rather perplexed. Obviously the two Phases are certainly to be distributed isolated! The problem faced has been that either regular Load RCD or the Smart Load RCD have been in the habit of tripping off upon Grid On / Off since installation. Even sometimes the RCD on the Input to the Inverter also goes off! The reason: the wiring of my home has become leaky for sometimes. I've been curious about the Phase difference of the two outputs of the Inverter. Is there any way to examine it's two lines 230 VAC (RMS) each. Probably phase difference of 120° with about 460 VAC (RMS) that amounts to be ~ 651 VAC RMS, oh no, sorry I mean to say 650 VAC Peak ! Moreover, the grounding croc clips of the O-Scope share the same common ground! Is there any way to compare the 2 outputs, one 'Regular Load' and the other 'Smart Load' be visualized on single O-Scope screen with custom devised High Voltage Probe(s) X100 on single or Dual Channel OScope? Note: The Inverter trips the RCD's on bringing the the neutrals near each other. I've a plan to examine the phase relationship of the Regular and the Smart Output phases without putting any load on these. The OScope to be used is a Rechargable Battery Operated ( Floating ) DSO ’ZEEVEII DSO3D12’ I've seen your kind vlog on a ’DP’ Passive Differential Probe utilizing Dual Channels on an Oscilloscope for measuring High Voltage safely, safe for the Operator, the OScope and the Device Under Test DUT. Would you suggest me to use similar probe for the situation faced by me. I'm waiting for 2 Accessory DP4100 Probes X100. With afloat DSO, the Cric Clips of the 2 DP4100 X100 grounded to earth and the probes on the two phases? Wouldn't it be safe for me , the OScope and the electrical system? Awaiting your kind response!
You *must* have a single ground. I mean a grounded spike to which all grounding convey, including the PE line. Power the oscilloscope referencing to that ground. Then use a couple of active differential probes rated at not less than 1000V. The measurement must be performed knowing the procedures of how to handle high voltages and you must know what you're gonna do because this could be lethal! I won't take liabilities. On the oscilloscope use math functions to know the difference between the two AC sources. You mention 460V RMS and ~651V RMS ...I don't think this is correct starting from 230VAC RMS, I'm afraid you keep confusing RMS with peak and peak to peak. Oscilloscopes *always* display peak to peak voltages. For voltages out of phase you can't really use the root square of 2 to go back and forth RMS. About the problem you face with that inverter I have a similar issue with a hybrid solar inverter, made by Voltronic, China. I have had no chance to investigate the problem deeply enough but it seems the problem arises from the fact that the inverter must disconnect neutral from ground when running over the grid, and reconnect it to ground when running over solar panels and batteries (UPS mode). What you describe, two separate neutrals, seems quite weird but for those inverter designed to run on two phases grids (no neutral) that are in use in some corners of the world. It seems an interesting case.
in africa we replace the board at once
Reference link for schematic diagram pls
Go to the website: accidentalscience.com
Ideally , the Professional OScope being properly grounded, and the device under examination has to be on an Isolation Transformer, which would allow one to take precise measures of the values. Thank you, Accidental Science!
Like most youtube video U talk about everything that do not matter.......did u forget to tell about your cat and your grandmother
9:42 I suppose at this point you meant 230uA rather than 320uA? O.K.? What are the safely full scale voltage measured by O-Scope with X1 and X10? Are these 3.2 and 32 VDC or RMS? 990 KOhm is almost 1000 KOhm or 100 MOhm to constitute a Probe 100X while in unison with standard 10X one. In my humble opinion, wouldn't have it been better if the Standard Probe used in X1 confuguaration for safety of the O-Scope? And all calculation done on the later basis? Help me if I'm confused. I'm a medical doctor happened to be an accidental scientist: may be on wrong side! I've never used any O-scope other than patient bedside monitors. My first ever entry level Chinese Rechargable, Dual Ch, SigGen O-Scope+DMM (ZEEVEII-3D12) with Voice-Assistant reached me 2-3 days ago. In search of safe use of the same I touched your KZread channel. In my life, I've been moved by a few, and you are one among those, I happily ❤️ declare. Help me please if I'm confused or wrong! Thank you.
First off thanks for commenting. Indeed your comment could be of help for others. It could be helpful because many could confuse some points that clearly I have taken for granted when they'd not ...that's the curse of people with experience :) The current value is correct: around 320uA @ 230VAC. So why it is correct? An oscilloscope do not take the RMS voltage but the peak(+DC) voltage, while it shows the peak to peak voltage. I know, this may arise even more confusion, but don't worry, follow me. Let's take a sine wave that you want to measure at the oscilloscope. The instrument will show the sine wave from a reference point that is the GND (ground) level. In respect to GND the alternate sinusoidal signal swings from zero to full positive; then back to zero (GND); then down to full negative and finally back to zero again, where the cycle start over again. So what you actually see on screen is a wave that swings from peak to peak. However what matters for the input circuit is the voltage peak as an absolute value, which is the maximum allowed voltage in respect to ground irrespective of the polarity. Indeed if we look at the specifications of an oscilloscope they tell us the maximum input voltage that is meant as peak+DC voltage. In other words it is the absolute maximum voltage, be it AC or DC. So speaking about a possible voltage to measure I took as a reference example 230VAC, the mains voltage in EU. Mains voltage is alwasy declared as RMS voltage. So, for a sine wave with a 230 RMS voltage, for the purpose of finding the voltage that the oscilloscope's input matter we need to find out the peak voltage. Which for such a sine wave is: 230 times the square root of two, or simply 230 * 1.41 = 324.3 Vpk. When we compute the current across a resistor usually we compute it as DC or peak value, rarely as RMS value. And since we want to know the voltage at the input of the oscilloscope we have to calculate the peak value. So the math is as follow: Input voltage 324 Vpk / (990Kohm + 10Kohm) = 324uA. Remember, the current flows through both resistors to GND. Now because we know the current, and because the same current flows on both resistors, we can compute the voltage across the 10K resistor: 324uA * 10K = 3.24Vpk. Notice we should also consider the input impedance of the oscilloscope which happens to be in parallel with the 10K resistor. Though since this impedance is about 1Mohm at DC (or at very low frequencies such as 50 or 60 Hz) it doesn't change much our computations: 1/ ((1/1M) + (1/10K)) = 9900 ohm, actually an added attenuation of 1% . The probe x1 change anything as it is just a chunk of wire. Now, about the safe usage of the instrument, understanding that you are not that experienced, I'd recommend you to avoid taking measurements from mains. Instead use it to make measurements of small voltages of devices fully insulated from mains. In such a case it is quite safe to use in any condition. I never heard of that brand/model of oscilloscope, BTW. Hope this will be helpful. P.s. Thanks for love. Love+Peace.
@@AccidentalScience I got your point! For all practical purposes, regarding AC voltage or current we talk about it's effective value, the root mean square RMS value that is equivalent to its counterpart DC's heating effect. It's the peak value of the AC V or C 'times' the Inverse of Square Root of 2 = 0.7071 In true measurement one has to consider the Peak Voltage or Current of the AC that's RMS value times √2=1.4142. So it would be around 325 uA. This has to be accommodated resistance and capacitance calculation. I'm grateful for reminding me!
Mains operated O-Scopes are grounded by the mandatory earth wire to guard off againts the radio waves, electromagnetic interference from nearby equipment or internal echos from O-Scope itself! Ain't I right?
Dear Accidental Scientist, I'm happy to find your channel by accident! I myself happened to be an accidental scientist in lifelong apprenticeship! I'm interested in making ones home less prone to surges and transients produced by grid in and off and from environmental forces. Thank you for your vlog introducing us how the phenomenon of EMP can affect the electronics around us!
I need/want a pool cue lathe.
Hello 👋🏻
What is you contact
I was so invested in this!!😆 well done
Very good Ing. You are mounters.
Lmk
There is one major advantage to the very cheap kit, you can learn to solder, maybe even well? If it actually works after your done, it's a plus
How can one know if an encoder is faulty? I have an encoder that I use for a project but I keep getting wrong values for the angle of rotation.
Unfortunately faulty encoders are tricky to test without a specific instrument that basically compares pulses vs angle, count them and check the maximum throughput. A simple tester can be made with an Arduino, a precision photocoupler and a rig for the encoder to test. Also an oscilloscope is required as well.
How do you get the schematics Sir?
It's my own design.
Very nice chuck fixture on that lathe. My main hobbies have migrated from EE over to Mechanics recently. I had never believed myself to be an innovator until I finally began with a few diy opportunities in recent times. I am saddened by the lack of instructions included with test equipments recently. So I am grateful for troubleshooting demonstrations such as yours. Accolades, and I wish you luck with your lathe!
Thank you mate.
Whitworth settled on a hexagon shaped surface plate so it can be rotated 60 degrees and eliminate the waves satisfactorily.
I read his whole paper and I don't remember he mentioned any kind of hexagon shaped surface. But I agree, the hexagon is the bestagon, after all :)
@@AccidentalScience From the book "The Whitworth measuring machine" 1877 page 7 "Sir Joseph Whitworth has lately patented an hexagonal surface plate with the view of preventing irregular straining the points of attachment" - With illustrations. from page 8: "Surface plates on the principle now referred to are found to possess so many advantages over the old rectangular plates that Sir Joseph Whitworth has adopted them throughout his workshops, and has ceased to use any others" Also in an oil portrait of him by Kennington he is depicted with a pair of them. Of course He did make other shapes too. You can get that book free online, its worth reading.
@@billshiff2060 great thanks for the information. I was thinking about his original paper, I missed that you said he "settled", sorry for the mistake.
@@AccidentalScience No problem. It gave me a chance to talk about his work which I admire. Even though he couldn't get along with anyone he achieved great things. His mentor Henry Maudslay on the other hand was much loved by all and became the father of machine tools but more memorable as a builder of men, including Whitworth and a legion of others. Every time I research any subject I find Maudslay somewhere in the back story.
8:45 😆😁🤣
My 10.2 PowMr will harvest so Load is being met but battery is not being charge till about 1800 w. The PV input readout is an arbitrary .5 kw till about 1800 w PV input. No one has had a clue why so far. A replacement 6.2 kW PowMr works perfectly. So the issue is surely in the 10.2 unit. Issue existed at initial startup.
Grato!!! Precisely what I was looking for .
Very nice demonstration of fault finding using schematics. I find that schematics are mostly very difficult to find for anyone outside of the industry, so I have to use different methodology - firstly check all electrolytic capacitors for signs of leakage/doming and replace any that have failed, then have a close look at the board - particularly components and soldered joints for signs of failure (under a microscope) - the fault that you had I would have found readily, and maybe in less time too. Next, look at power supply circuits and check that they're functioning as they should, and check all discrete semiconductors Then locate blocks of circuit that I recognise and test the components in each block. By this time most problems have been fixed. Checking the datasheets of unknown multi-pin ICs often comes up with sample circuits, many of which have been utilised by circuit designers - that makes some fault finding very straightforward. If after all this the fault remains and a schematic is not available, it's probably time to invest in a replacement pcb...
If you are interested on how to proceed without schematic I made this video: kzread.info/dash/bejne/q56s16-wfLGdqqw.html Hopefully it will be interesting for you. Greetings from the Alps.
bravissimo!
well what if you're trying to fix a random board with no schematic where you don't know the expected values? the video tells nothing about that 😐
Next video.
Thank you, i was always afraid to connect my scope to mains.I know what will happen, but I was nor sure way.