CALCULATING, WINDING AND MEASURING A CHOKE
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- čas přidán 3. 07. 2024
- Check out the spreadsheet on my website:
www.delatsch.com/shop/
Check out the new Choke iOS App Available on the Apple's App Store:
apps.apple.com/us/app/id15219...
Method for measuring described in the video:
dalmura.com.au/static/Choke%2...
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Thank you for sharing this information. This is a big help.
Thank you!
Now that's a way to unwind after a difficult day...
I suppose the quick way would have been to find a core which is exactly the same size and wind off of one onto the other. You can get the winding machine to count it for you and you won't get a rats nest of wire!!
Great excelente video gracias! Perfect to upgrade a power supply of vintage amps
Thank you!
Bravo!
Thank you!! I knew it was worth to subscribe to this channel!! Also, wear gloves, I know you know you need to use gloves, but after having little accidents myself I got so used to use gloves that a cringe a little when people is using sharp stuff without gloves :P
Thank you very much! I agree, gloves and eye protection are never a bad idea.
Hi Marko,
I finally... took enough time to carefully watch your video. I have watched it before but sometimes I have to slow down a lot to get the details. I do want to ask that about 6:18 in your video where you show the schematic of how you measure inductance under a DC bias, you show the DCR of the choke in your schematic - this is the same circuit I use - but do you take into consideration the value of DCR in your calculation spreadsheet, i.e. do you measure DCR before the test to use it in the calculation of inductance or is that not necessary? I have not taken into account any value of DCR of the chokes in my spreadsheet and maybe my measurements are less accurate (?). Thank you for your videos and please stay safe.
Hi David, the DCR is not used in this formula and I think it is negligible for this type of measurement. Thank you, looking forward to your new videos!
thanks for letting me know
Finally dotarłem do końca :) Oglądanie nawijania jest całkiem terapeutyczne. Kiedy jakieś nowe filmy?
Bedzie niedugo nowy film :)
@@Delatsch Oo no to super!
Couldn't you put the bobbin onto your winder, then pull the old wire from the choke? The winder will count the turns as you pull off. That would save manually counting the turns on the original choke.
Yes, I was thinking about it, and I even have two winders and same empty bobbin, but once I started it was already too late. Next time I will do it that way for sure! For modern chokes and transformers that should work, but for older transformers the potting is too strong and the thinner wire snaps easily.
what's the air core gap for? what happens if you just stick the EEs and IIs together? i have one transformer here of that same size, i removed all wires and then i put 3 turns of heavy 6 mm2 wire on it, i need 0.50 micro Henry at 100 Amps , 24 volts; but the EEs and the IIs are welded together just like in a microwave oven trafo, will that work?
edit : later, by trial and error i got it: microwave trafo,sawed off the IIs(the "cap"), then all wires removed, then 11 turns of 6 mm2 wire; bingo!! the power draw at IDLE went down from 3.6 Amps!! (no coil, just a straight 6 mm2 wire) to .6 Amps ( this at 48 volts, on a 14 Kg steel toroid trafo, 2000 Watts+).
note: the gtrafo must stay OPEN, the "cap" not on, just the EEs, no IIs. with the cap on it buzzes and the Amps jump to .8 Amps.
I usually estimate the permeability since I re use cores, larger ones are usually around 1.6tesla, and smaller ones are usually around 1 tesla.
It also depends on the original purpose of the core as well, such as if it was for continuous use or not.
You winding naked, does that make it more comfortable? I will try this as i get uncomfortable aswell, thanks for the vid
What thickness of wire would I have to use for a 500mA choke? And for 1A? Thank you.
For 500mA you would need 0.45mm wire and for 1A you would need 0.65mm wire.
Cantt the winder machine be used to unwind by hand, just using the counter on it not cranking like when you wind?
Of course it can, especially since I have several winders... But, in that moment it didn't ring a bell :)
@@Delatsch still great job 😀 I am learning how to wind now with my DIY winder which is straightening the wire before winding cuz I will reuse wire from other transformers I am only waiting for my used transformers to arrive 😁
@@jordangogov5866 Nice! Just make sure the isolation is still good on the old wire. Enjoy the winding!
@@DelatschThx, it's new wire from new measurement toroidal tranformer but the important core part is noisy and I got 3 of them for free and they told me that the wire is very high quality 0.6mm2 with special insolation. It's very hard to unwind them but I found a way, the end result is very kinked wire which needs to be sthraten before use 😄
Takodje sam hobi motac , a ne mogu da nadjem gde da kupim limove , uzmem lim od starog trafoa al onda moram da ga ocistim , i u tom ciscenju skine se lak, i onda su mi trafoi jako losi .
Jel bi mogao reci gde da nabavim lim u Srbiji?
Ima firma Aktiv u Beogradu: rs.kompass.com/c/aktiv-2000/rs0022604/
@@Delatsch E haval druze , nasao sam na KP nesto 400 din kila . ako sam dobro razumeo .
koliko ti inace placas
@@dedskin1 Mislim da je oko 300 dinara kg, ali ja zivim u Poljskoj pa kupujem ovde malo skuplje.
@@Delatsch aha , very nice i moj buraz je tamo , al njega zene ne vijaju po tjubu jer lepo peva :) haha
From this sheet can we find three phase input line choke calculation
It is designed for filter chokes in power supply filter circuit, so I don't think it would work for three phases.
@@Delatsch do you have calculationa for three phas
No, unfortunately I don't.
What if we do this using lcr meter?
You will not get realistic values due to lack of DC current that magnetises the core.
@@Delatsch when I wind I measure the inductance with my lcr meter at 100hz frequency
@@kolarkaraudioresearch That is fine for inductors that don't don't have DC current flowing in them. If there is DC current present, you need to pass the rated DC current through the inductor and then measure the inductance at that level of dc saturation of the core. In that case it does not work with LCR meter.
does your spread sheet work on all types of transformers
There are different spreadsheets for different types of transformers. The best would be to check the website and see what each is for.
@@Delatsch i want to rewind 100kva transformers
@@mohamedhadjhafsi9441 The calculations probably work, but I guess insulation and other safety practices with the build itself are probably more involved, so I would recommend finding something specific to high power transformers. My tutorials are mainly for tube amp projects and relatively low voltages.
@@Delatsch thanks for replying, do you happen to know anyone that can provide me with information about high power transformers calculations
@@mohamedhadjhafsi9441 Unfortunately I don't.
Any coil wound on bobbin is not hi end. Maybe for PT, apsolutely no for OT ....
I'm not interested in high end, I prefer the dried horse shit bobbins. What do you use to wind your high end OTs?