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In Reply to: RE: And So is US Coils posted by Skip Pack on April 01, 2023 at 09:27:30
and that sure looks like the address where Erse Inc was at or near by.
Follow Ups:
From Danny Richie at GR Research: "Guys, here is the lowdown on that. I dealt with them for years and knew the owner pretty well from years of doing business with them.
Erse was a US company. Caps and bobbins (plastic parts for winding coils on and laminated I cores) were made in China under the Erse name.
Those coils were wound in the US using US made Copper. The US Copper was 99.99 pure Copper. So quality was high wire.
The owner passed away last year and his widow sold off the inventory and closed the doors.
The coils that were made by the Erse China plant uses Copper wire from China. That means it is often (like a lot of China produced Copper) recycled Copper. It tests 94 to 96% Copper and the biggest contaminate is Copper oxide. So it will not sound the same as coils made with high purity Copper.
Moving ahead, three of the employees that worked for Erse in the US are now running US Coils. So high quality US made coils are once again available."
Good news for the industry it appears.
JCarney
Can you specify a coil of a given value and wire size with the same number of layers as turns per layer?
Otherwise? Not the 'best'.....
Too much is never enough
From pictureguy:
"Can you specify a coil of a given value and wire size with the same number of layers as turns per layer?
Otherwise? Not the 'best'....."
No I cannot. Also, no where in my post did it say "best". Danny did say "high quality US inductors are once again available" made here for the diy guys and the industry. I was simply passing along info relevant to the op found on another site.
JCarney
Sure. Use high quality wire. good start. Much more to it than that....
If you'll pardon the bad joke, I've been round and round with inductors for my Manepan crossovers and have reached several unflattering conclusions about most 'stock' inductors.
My best? I designed one and went thru several iterations using an online calculator and was able to match the DCR of the original within about 5% at the same time fulfilling my original requirement from my first post as well as making it air core....not like the stock inductor's iron.....Power handling of 'new' is much better than stock since wire size goes from 16ga to 14ga.....
Too much is never enough
Again, I was passing along info. I could not do what you did by designing an inductor. I neither have the expertise or the patience. I am the wrong guy to ask these questions. I am the parrot in this scenario.
JCarney
Not all THAT bad a task.
I used an online calculator and just entered some dimensions. Wire size? and various coil dimensions.
I converged on what is considered the 'best' solution where the number of layers of the coil is the SAME as the number of turns per layer. This yields a coil which is SQUARE in cross section.
Than I adjusted using standard PVC sizes to decide on CORE size. Square? This MINIMIZES stray fields.
Lastly? I factored in the length of wire needed which after reference to online tables, gave me the DCR of the coil.
You run a pair or even Three 'simulations' using the calculator. than you see which WAY the numbers go. And adjust. In just a few iterations (half hour, tops) you have the numbers needed to successfully improve whatever crossover inductor you wish....
I have a spreadsheet somewhere if you want me to find and email to you. You can sort of follow my process....
For example? Magnepan has a single inductor in the MG16. I is 3.5mh and 0.40 ohms.
People who rebuild these crosovers ALWAYS gravitate to the lowest DCR they can find and have a company dewind to spec. That's gonna change the balance of drivers.....a LITTLE, but real.
My solution raises power handling since I made an aircore design and I can't remember if I specified 13ga or 14ga wire......larger than the 16ga Magnepan uses.
Too much is never enough
from them on my next Xover build.
Thanks for the info.
You're welcome.
JCarney
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