DIY transformer/inductor tester
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- Опубликовано: 27 сен 2024
- Shorted transformer hard to tell? Let's build a tester of transformers and inductors. It can identify shorted windings, including just 1 short turn. It's hard to test switching transformers and inductors for internal shorts using any other tool. This tool is very useful, especially when fixing switching power supplies and inverters. It's a simple ring tester, testing the winding based on the number of damped oscillations it can make. An internal short will turn a high Q factor transformer or inductor into a very low Q one, resulting in way less damped oscillations (rings). The Q factor is affected by the internal short turns way more than the inductance is.
The next episode (in-circuit test capable version):
• DIY transformer, induc...
The tester and program on my website:
danyk.cz/avr_r...
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/ savage_danyk
Definitely going to have to build one of these. I fix old TVs and related junk, finding shorted flybacks would be very useful.
Very interesting. This is a revamped version of the old school analog flyback testers used in TV repair. Good explanation too.
I wonder of its similarities or differences from the “blue“ flyback ring tester
IMPRESSIVE performance!
Never tought it would see one shorted turn
One shorted turn makes a huge difference to the number of "rings".
Amazing demonstration of designing, making, and explaining how the tester works.
I learn more in one of your videos that I've ever learned studying electronics in school... Great video as always.
I see this comment almost under any DGW video. ;-) I enjoy these videos too, especially cats comments.
ruclips.net/video/NwuY7qbs2Dkl/видео.htmline follower robot💝
Idem i' m 16
@@user-et1vj1oz3f Many more and be healthy ! :)
@@velceaiulian6439 thank you same for you!
Mr. diode sir…
I know you’re a busy man… But I would be so happy if you made some more general troubleshooting videos. About fixing power supplies and common stuff like that.
They help me so much and they are very interesting to watch! You are one of the best teachers!
I've been watching your videos for long now, I like your voice and accent, it's so charming. Also, I want to be a engineer so watching your videos would definitely help me!
ruclips.net/video/NwuY7qbs2Dk/видео.html
Pid line follower
@@embeddedsystemsiotprojects2055 gooood job 👌
With projects like this, I like to download the C source code and re-write it in assembly language... but with your projects, you've already done all the good work. ;)
I'm glad somebody else also appreciates assembly ;)
Wonder how this varies from the “blue2“ Bob Parker ring flyback tester? Always love it when Danyk talks about test equipment. Especially DIY test gear
I still have the original Bob Parker designed unit (released through Silicon Chip and Dick Smith Electronics) which is the shorted turns tester that he designed for testing flyback transformers. It works on a similar principle - a low frequency pulse generator that applies that to the coil or transformer under test and the number of 'rings' is counted and shown on a display. In the case of my unit it has a bargraph and uses transistors, an op-amp and a CMOS IC.
The unit presented here uses a PIC microprocessor and presents the results on dual 7-segment displays.
@@sw6188 This μcontroller's architecture is AVR, not PIC.
@@vaclavtrpisovsky Sorry, I wasn't aware of the AVR type of microcontroller. Technology leaves me behind some days!
Line follower ruclips.net/video/NwuY7qbs2Dk/видео.html
I looked it up.... it seems similar, but a bit overcomplicated, and it probably counts the rings down to a lower threshold, resulting in more counts.
You once said you never went to school for electronics. This is even more impressive!!
Absolutely fantastic little circuit, I will be making one this weekend :)
Something DIY after long time.😀
Great video with great explaining.
Really useful device! I might have to make one some time.
Some of the Atmel MCUs (including Atmeg 328) also have an internal comparator which would be more versatile than a regular input pin. You could use it to make the threshold selectable in software (combined with a simple PWM DAC).
You could also use comparator like LM393 connected to 4026 counters and 7seg display. However, these counters don't have the latch mode. 4553 would be great, but they are expensive and hard to get.
@@Ales.2000 I'm sure you could do it that way without a MCU, but I think it is well worth using the MCU for a device like this. In many ways it is simpler that way in my opinion. You dont need a bunch of specific logic chips and a complex schematic.
This is such a great idea. Previously I've tested coils by manually putting a charged capacitor across them and watching an oscilloscope. This would be so much easier, especially since I don't have a storage oscilloscope. Maybe I'll build a hybrid version which just pulses the MOSFET with a 555 to ring the coil and then hooks up to the oscilloscope.
Yes, you can just put pulses from a 555 oscillator into the gate, and use no counter, just watch it on a scope. If it's an analog scope, it's better to use a higher frequency to make it better visible. Maybe 50Hz.
@@DiodeGoneWild Was the MCU code difficult to write for this ringer-tester, in order to get the timing right?
@@DiodeGoneWild can u please make it with a 555 ? i have an analoge scope 🙏
Nice ! And this bodged circuit is far more useful than most ebay/amazon phone chargers.
I like those red boxes, perfect for LED based projects
Nice scope. And cool idea/principle for measuring.
11:38 Niiice red hot glowing resistor lead effect. :)
16:43 "There is some power factor correction inductor from an active power factor correction". Excellent sentence to repeat few times before bedtime to keep boogeyman away.
Pid line follower
ruclips.net/video/NwuY7qbs2Dk/видео.html
@@embeddedsystemsiotprojects2055 gooooood man❤😎👌
Cant you calculate the inductance too by measuring the oscillation frequency? Then you can use the LC equation to determine the value of the inductance.
What a fantastic informative video. I have to build one of these - soo handy!
Nice device , also can use to find out the transformer self resonant frequency by connect to scope..
For cheap occasional use, I'd love to see this use just a PC and Arduino. PC's serial terminal can fast scroll the count.
Wow, that cat is always right! Indeed time for some insightgiving scopepictures!
But what a great and superusefull idea, this circuit! And what supergreat to share your program with this circuit! Thank you só al lot, because it makes copying your superusefull device so much more faster and easier for me, for us! There is nothing to try to improve it because you showed us already all the things one could think of. Indeed ideal as it is, and this way i would be stupid to nót build it because i can use it just as good because i have to build my ideas with mostly "recovered" components! Wow i am still impressed by your generosity (if that's the right word (i'm dutch)) to let everyone make use of your knowledge!(i remember years ago i found the circuitdiagram from my broken pc-powersupply on your website, áll the circuitdiagrams to easy choose from which one must be the one i had Just opended. I was (and still am) só greatfull for that!)..
And now you did think out this ideal and especially easy to build device that i can and thanks to you wíll use within a couple of days
Although slightly more dependent on special equipment. This can also be tested by making a wheatstone bridge where 2 legs are resistors and one is a known good inductor or capacitor in parallel with a potentiometer. The device under test is the final leg. after balancing the bridge (excited with an AC voltage or current) the ratio of resistance to reactance is shown by the potentiometer and capacitor/inductor. While this requires an ac source and detector, that could be as easy as a mains transformer and voltmeter if component values are large. All other parts can typically be found from scrap.
Brilliant! Thank you for sharing this and teaching us.
Excellent video. Thank you for all of the visuals!
Steady on! Looks just like a bought one.
Hahaha, yeah, it looks far too professional compared to for instance his battery capacity tester, which works so well, but looks absolutely terrible :-)
I built the CD4015 + LM393 based ring tester designed by Bob Parker a few years earlier. It can count only to 8 (with an LED bar), but still very useful. I would build yours if I haven't built the other one previously. I am an absolute dummy in programmig, so I had to choose a software-free version.
great educational clips just like always. Thank you soooo... much for sharing. You are amazing.
I have make it. In these days I build my version...
my respect for your knowledge dany 😯
lol Watching a build for a change. Cool tester. Thanx.
Nice project and good explanation...
Will you please do video regarding to the conversion of TL 494 /KA 7500 powered half bridge SMPS to adjustable bench power supply with current control.
Top content. Thank you for sharing with us.
Great idea with this tester. Maybe next time you will make a power transistor tester, but one that will put a heavy load on them. :)
Very interesting. Thanks!
Nifty principle and well implemented
because you know the number of rings, the amount of time they take and the capacitance you could also calculate the inductance.
Very nice. I want to build this to compare to my Sencore LC75 ring tester.
piece of art!
Wow. Interesting that one shorted winding has that effect on the ring. Small suggestion: use double dash for open? Just looks nicer I think. O r OL like multimeter.
I also tried it, but one dash draws less current from the battery when it's not connected to any inductor :)
@@DiodeGoneWild
ruclips.net/video/NwuY7qbs2Dk/видео.html
Please 🙏 make a video on the diy inductance meter.
i have the schematics saved from some channel were the guy made a simple circuit that could tell if there is a fault in the winding's of a motor coil. ill try and look up the link in my saved videos.
IF ANY ONE CAN TELL ME IF YOU CAN POST A PICTURE UP ON YOUR PAGE I HAVE THE SCHEMATIC IF ANY ONE WANTS IT. (NOW THIS CIRCUIT IS ONLY FOR MOTOR COILS. NOT TRANSFORMERS LIKE WHAT DANNY IS BUILDING HERE)
P.S. IF ANYONE IS INTERESTED IN THE CIRCUIT I WAS TALKING ABOUT SEND ME YOUR EMAIL ON ME PAGE, AND I WILL SEND YOU ON THE PICTURE OF THE SCHEMATIC.. IT'S A VERY EASY BUILD. EVEN SOMEONE NEW TO ELECTRONICS WOULD BUILD IT IN ABOUT AN HOUR.. I BUILT IT MYSELF AND ITS GOT ME OUT OF A HOLE, SO IT'S WORTH MAKING.
You can always upload it to your Google drive and share it with everyone that has the link.
rhank you!
interessting slang, but perfectly understandible !
and great video, my teacher since ...should be good as you! then i probatly would be better, than i am now in repairing things.
best regards, long and healthy live !
Sorry for my poor english !
Software solution to in circuit loading is to adjust threshold based on ring 0 amplitude
Great video as always
These days, it can also be vital to know the operating frequency range of an inductor i.e. is it iron dust or ferrite. Would it be sufficient to measure inductance at a range of frequencies - any thoughts ?
I will test it on arduino, and the output is on sreial monitor as usual. Thank u.
That's a very useful tool.
A cheap LCR meter that displays Q or Rp will also show a lower number in the presence of a short. The skill is always knowing what the measurement means. Ceramic caps should never be used for anything measurement or timing related. These applications always use polymer devices.
Nice sharing sir watching here sending full support
Is it possible to change the code to regular Arduino compatible instead of assembly? Currently I don’t have the atimy chip.
Thanks for the video.
to musím mít :) Díky
Fantastic great informative video
really love this one!!😁
genius! I love it!
you are the best , thanks a lot
12.17 you can also use this device to test capacitors. 😁😁😁😎
Thanks for the project! I will try to build this, but I can't seem to find "LD-D036UR-C" display - any alternatives?
Very cool. Thanks!
Excellent !
but i do it lazily , just by connecting led to secondary winding , and pulsing dc to primary winding to see roughly if T/F is shorted or not
Very interesting!
Inspiring video, as always. I wonder if this could be used to test windings of a motor. I have a few questionable ones and I'd like to to be able to prove they have a problem or they are OK. Any thoughts?
It might work, but there are generally less rings in inductors with iron cores, motors would probably be similar. It might require a higher capacitance or counting the rings down to a lower threshold.
23:35 new digi os sc
Muy buena herramienta, interesante
Very interesting 👌
I see a possible flaw on your schematic diagram: if you do not drive each segment of each 7-segment display at a time, those 560 ohm current-limiting resistors on the common line will make the brightness vary when an 1 or an 8 are displayed.
great channel
Great project. I wonder if you could use analog pin and count the spikes manually. Or perhaps use some ARM chip and do FFT or at least try to estimate the exponential decay factor rather than counting the number of pulses
Yeah you would need something much more powerful than an 8-bit MCU for that. The ADC in these is way too slow for anything like this.
You could maybe measure the resonance frequency though, that would be somewhat useful too.
@@Basement-Science I guess just adding a better ADC would allow that though, FFT is pretty complicated but it should not take more than a few seconds for any MCU to do
@@maxxiang8746 Sure you could do that if you want to do relatively simple analysis like FFT. But then you'd probably be better off just using an oscilloscope instead of investing in a fancy ADC. Storing all the ADC data on an 8-bit MCU for later processing, you'd also run out of memory pretty quickly.
I found a flaw in your design: the transient amplitude varies between -5V and +5V. Hence, the AVR input will receive negative voltages that will probably damage it.
watch the whole video ;)
Made one...does not work as shown re-number of rings. Changing input 1/2 to 1/4 makes zero difference. Tried to contact author through here but apparently not open for discussion. ie...no reply.
Yay!
Good sir
It Was Awesome
I would normally assume you'd want a fixed resistance higher than the esr of the transistor and capacitor to control the losses, but maybe any significant resistance is too much and causes it to be overdamped?
I wonder if the tester actually, at least in some degree, shows the Q of an inductor.
BTW great video :D
If you set the threshold to exp(-pi) * initial voltage, number of counts should be equal to Q. Here is the description of the method, but it is in czech :D imgur.com/a/YWvCuZI
@@mlok712 Thanks !
If the threshold is set one half, multiply counts by 4.532to get Q
Perhaps you can make use of hysteresis analysis for testing iron core transformers?
Brilliant! Excellent application of utilizing the characteristics of the ringing to an advantages. I wonder how long it will take for your design to be swiped, manufactured and end up for sale on Ebay? I would like to see the circuit redesigned to just drive an oscilloscope, please and thank you.
Super.
It's so accurate!!
The one you refering "Chinese capacitor" are actually called Maylar Capacitor, it is common to the Asians, specially in the Philippines.
How can we upload the software to atmel attiny24a
Awesome
Cool.
Very cool¡¡. I wonder if the 10K resistor in the ''sense'' pin of the chip could be higher to reduce leaching energy by the clamping diodes on negative cycles. Anyway the wavewforms seem to support the idea tha this effect is normally small.
Well, the 10k resistor reduces the number of rings a bit, but when I use a higher resistance, it has problems with very low inductances. They resonate at a high frequency and so a high resistance resistor doesn't manage to charge the capacitance of the input pin in time.
Think you could possibly build a clone of the HP 547a current tracer ??
One of the most useful troubleshooting tools of all times that is so ridiculously over priced now… Most folks will never get the chance to try them.
If you made it more sensitive and count more rings, eg, 100, does it still drop to 1/0 when you add a shorted loop, ie, maybe it would be better with more counts. If it drops to 10 it probably wouldn't be worth it because it's the same ratio.
Could you try to tear down a JBL speaker with "JBL connect"? I would really like to know how they achieve to daisy chain up to a 100 speakers.
Very clever idea to test transformers! But don't you need a reference for each transformer, esp. when there are only very few turns shorted?
I think you don't. Most transformers will go from 5 or more rings to 0-1 ring with just 1 shorted turn.
very nice idea :)
Hi! I'm here to tell you that the links to your website return 404 errors.
Is it right?
Oh, I see: it's not configured to route requests over HTTPS to the same website.
Notak, ale příště odpory pro každej segment, protože tohle je doslova danykovský zapojení displeje :D
Vždyť tam přece jsou odpory pro každou samostatnou LEDku :) multiplexuje to po segmentech, ne po cifrách, takže svítěj maximálně 2 najednou.
@@DiodeGoneWild Tak to potom dobrý :D Jak je tam udělaná ta pomlčka ? Protože dle mého soudu tam vždy minimálně jeden impulz bude, a to vyvolaný opětným nabitím kondenzátoru
což se dá vlastně ošetřit měřením pouze sestupných průchodů referenční úrovní
ممكن اضيف ترجمة بالعربي
Can we use this LC oscillations on scope measurement to measure the inductance of a coil?
Thank you Dan. It’s long time I want to buy the blue ring but I couldn’t for some reason. Very informative video thanks a lot. Please make update the link it’s not working! I want to make this pcb we will need program of microcontroller.
When I click the link, it works.
Amazing
I have a question though. Is the displayed number on the device shows the number of windings of the transformer or inductor?
it shows count of pulses. Explaining at 02:42
@@maxcompress9732 thanks