Inductance value?

[jing]

Hi guys, I have two mh level inductors but not sure what value they are.
One marked as 4104 the other 4117.

Appreciate your help.

Jing

Sent from my HUAWEI MT7-TL10 using Tapatalk

 

[Ron E]

I saw two cars on the way to work today, one had the license plate reg567 and the other was 326hky, what brand model and year do you think they are?

 

[eriksquires]

Jing,

Sorry those numbers don't mean anything to me. Perhaps post a picture? Also, a little context. Did you pull them from a speaker? Did they fall out of the sky? These could help.

Best,


Erik

 

[jing]

Jing,

Sorry those numbers don't mean anything to me. Perhaps post a picture? Also, a little context. Did you pull them from a speaker? Did they fall out of the sky? These could help.

Best,


Erik

Thanks Erik,

Yes they are pulled out from speakers, with a 2.5 way cover like this:

 

[eriksquires]

You are killing me! Post a pic of the actual parts, not the drawing please.

Erik

 

[jing]

You are killing me! Post a pic of the actual parts, not the drawing please.

Erik

I think that would be easier as the tweeter recommend fc is 4000.

Sent from my HUAWEI MT7-TL10 using Tapatalk

 

[AllenB]

Um, OK 400uH but that's just a guess. I mean, with 3u9F that gives 4kHz into a 5ohm resistor, but probably close enough.

 

[jing]

Um, OK 400uH but that's just a guess. I mean, with 3u9F that gives 4kHz into a 5ohm resistor, but probably close enough.

Sorry. They are 8ohms drivers.

Sent from my HUAWEI MT7-TL10 using Tapatalk

 

[AllenB]

I'm telling you the following facts..

The value of inductance that resonates with 3u9F at 4kHz is 400uH.

The load value that damps this LC for -6db at the knee happens to be 5 ohms, just saying.

You haven't given us enough information to be any more precise than this, it just isn't that simple.

.......

However, I think it is an excellent guess considering that many 8 ohm tweeters are at approximately 5 ohms and near resistive around where they are typically crossed, and reasonably flat in their response. 390uH is a commonly available value.

 

[_henry_]

I saw two cars on the way to work today, one had the license plate reg567 and the other was 326hky, what brand model and year do you think they are?

its quite amazing you can remember 2 car plates on your way to work. are you a policeman?

 

[system7]

What might 4104 and 4117 mean?

Well, IMO, 0.4mH might be a reasonable value for a tweeter coil, but 1.7mH would be excessive as a bass coil in an unspecified parallel MTM bass circuit. 0.5-1mH makes more sense.

So whatever those numbers might mean, you really just have to measure. Buy an inductance meter. About £70.

Better than Ouija Boards, magic pendulums, numerology and all that other guessing.

 

[jing]

Thanks guys for all the help. I finally got a message from manufacturer that they are 4104/0.375mh, 4117/0.485mh.

The marks make no sense at all.

Sent from my HUAWEI MT7-TL10 using Tapatalk