If one were shopping for chokes to use as audio frequency filters (think graphic equalizers) for what would you search and where? All I am finding is common mode chokes and power supply chokes.
J.W. Miller was known for a wide variety of small chokes and other inductors. They were bought out by Bourns, Inc in Riverside, CA, and Miller's product portfolio was slimmed down a bit and the products were given Bourns part numbers. You could check Bourns' website and see if they still have what you are looking for.
Coilcraft can make about anything, check them out.
Tell them what you need and ask to buy samples.
https://www.coilcraft.com/en-us
Tell them what you need and ask to buy samples.
https://www.coilcraft.com/en-us
Thanks guys. Will check it out. I probably out to figure out a convenient way to measure L as I have access to a far number of unmarked salvage coils.
Lundahl has a number of audio chokes of good quality. UTC was making chokes for audio, check their A and O lines. One attribute of an audio choke is low winding capacitance, which is achieved by high degree of winding sectioning, or winding techniques for spacing wire.
Check out speaker driver sales companies like Madisound as they have a large range of chokes of different qualities and values in the audio range. Air core are the best because they don’t saturate easily.
No idea the scale of your project : What sort of inductances do you have in mind? Would something like these do what you want?
Hearinspace,
Just occasional pass filters or line level eq. Values up to 10s of Henries are likely. I suspect that infrasonic filters would require ridiculous values in the hundreds of Henries so probably not practical. It would be nice though since you could get a small bass boost plus infrasonic roll off with just one each L and C.
Just occasional pass filters or line level eq. Values up to 10s of Henries are likely. I suspect that infrasonic filters would require ridiculous values in the hundreds of Henries so probably not practical. It would be nice though since you could get a small bass boost plus infrasonic roll off with just one each L and C.
Ah, OK. I have a few here I thought you might be able to use and took your post as an opportunity to get them off my shelf and serve humanity at the same time. : )
As the original style is obsolete, I suggest try one of these more recent designs. SQ1212H 5mH, 3A seems to fit the pin spacing which is 13mm*10mm : https://www.aliexpress.com/item/1005006004013145.html
Depending on the range of values you are searching for, perhaps you can buy toroidal or pot cores and make your ones yourself.