Did you test them to 6A? I'm all for DIY inductors although normally I wouldn't consider these at all.. but if they measure OK then I'd accept them.
The thing is that a common mode choke is only intended to react to a small amount of noise. For it to pass a lot of current it has to go through both sides, but then the inductance cancels.
The thing is that a common mode choke is only intended to react to a small amount of noise. For it to pass a lot of current it has to go through both sides, but then the inductance cancels.
Hi. I found laminated steel toroidal cores in local producer. OD: 130mm, ID: 102mm, HT: 25mm. (there is also smaller one about 60x40x20mm too)
What about making 10mH inductor with them ? They are also cheap. About 4 USD per kilogram.
Maybe i can use minimal copper and this will reduce the resistance too. Chatgpt tells 58 turn is enough to make 10mH.
I will use it for SB34NRX75-6 . I have space in the 70liters box.So space is not a problem
What do you think
What about making 10mH inductor with them ? They are also cheap. About 4 USD per kilogram.
Maybe i can use minimal copper and this will reduce the resistance too. Chatgpt tells 58 turn is enough to make 10mH.
I will use it for SB34NRX75-6 . I have space in the 70liters box.So space is not a problem
What do you think
If you like inductors that saturate at the drop of a hat, then make inductors using those cores - ungapped, right? To add insult to injury, silicon steel has a very square hysteresis loop, so the onset of saturation will be very sudden. If you want to try a little experiment, connect an inductance meter across your finished inductors, and drive some DC through them with a bench supply having a variable current limit. Given enough DC current, your inductance will disappear like magic.
Yes unfortunately they do not have air gap. I told producer if they can make it with air gap and he told me if they can sell it they will do it. I do not know if they can find many people to sell them.AFAIK it is hard to build laminated steel toroidal core with air gap.
How many amperes they can handle if i use them? If they can stand to 5A it is more than enough for me.
How many amperes they can handle if i use them? If they can stand to 5A it is more than enough for me.
They also have EI core with air gap. And they are very cheap. 1,5 USD per kilogram. But i am not sure if they are grain oriented.(maybe not because of cheap price) I will ask them. Wont be better than I cores?
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I have received response from producer. EI cores is non grain oriented and 10000gauss( afaik 1T) Is it possible to make inductor with them ? Ei84 is code.
Your options for crossover inductors in Turkey may be somewhat limited. You can maybe try inductors using ferrite drum/bobbin core. That will take fewer turns for 10 mH than with a totally air core design. You can likely find ferrite drum cores on Ebay. They may even be specified for an inductance coefficient.
These are ferrite drum cores available on Ebay - They have an inductance coefficient of 113, so they will need a fair number of turns to get the inductance you seek. You can glue some plastic to the ends to allow them to hold more turns. The Ebay listing is here:
https://www.ebay.com/itm/2617896373...WZhPdhKBX5apUEYPxB6+LkI5c=|tkp:Bk9SR4aD0umiZQ
These are ferrite drum cores available on Ebay - They have an inductance coefficient of 113, so they will need a fair number of turns to get the inductance you seek. You can glue some plastic to the ends to allow them to hold more turns. The Ebay listing is here:
https://www.ebay.com/itm/2617896373...WZhPdhKBX5apUEYPxB6+LkI5c=|tkp:Bk9SR4aD0umiZQ
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I would just leave it alone and deal with the extra length of ferrite rod, or maybe try to push it in so that it is more symmetrically oriented with respect to the coil.. Keep also in mind that the other inductors in the crossover will need to be oriented at right angles to this one ( if they are similar style construction) to avoid spurious pickup.
I need two inductors for my woofers at minimum, and I also need inductors for my full-range drivers for 2nd-order filters, which means I need a total of four inductors. However, I currently have only one ferrite stick core.
There are plenty of CRNGO (Cold-Rolled Non-Grain Oriented) steel options available, but I haven’t been able to find CRGO (Cold-Rolled Grain Oriented) steel yet.
I plan to look for the highest quality CRGO steel possible (preferably 0.2–0.3mm thickness). Since manufacturers typically don’t sell in small quantities, I might buy in bulk and resell to others who need it.
By the way, I’m interested in Torobars and Jensen C-coils. Does anyone know if they are made by gluing two C-cores together, or are they single C-cores with a very small air gap (around 1–2mm)? I searched but couldn’t find any images of them opened up.
Any insights would be greatly appreciated!
There are plenty of CRNGO (Cold-Rolled Non-Grain Oriented) steel options available, but I haven’t been able to find CRGO (Cold-Rolled Grain Oriented) steel yet.
I plan to look for the highest quality CRGO steel possible (preferably 0.2–0.3mm thickness). Since manufacturers typically don’t sell in small quantities, I might buy in bulk and resell to others who need it.
By the way, I’m interested in Torobars and Jensen C-coils. Does anyone know if they are made by gluing two C-cores together, or are they single C-cores with a very small air gap (around 1–2mm)? I searched but couldn’t find any images of them opened up.
Any insights would be greatly appreciated!
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