Coil Inductance Value? - Page 1
Forum section: electronics / projects

author: yalect
author_rank: Regular Contributor
timestamp: April 18, 2025, 08:09:07 am
content: Hi,I would like to ask you that I have a small copper inductance or coil, I want to know its value but I haven't a tool to measure it.Please, maybe you can determine itsapproache or closer valuefrom the measurements below?.- Outer diameter (D) ≈ 4 mm = 0.004 m.- Inner diameter (d) ≈ 2 mm = 0.002 m.- Coil length (L) ≈ 2 mm = 0.002 m (Pin to Pin).- number of turns is : 2.Thank you.

author: RoGeorge
author_rank: Super Contributor
timestamp: April 18, 2025, 08:15:24 am
content: Search for online inductance calculator, then plug those numbers in one of those calculator webpages.

author: yalect
author_rank: Regular Contributor
timestamp: April 19, 2025, 06:48:02 am
content: May it's easy to determinethe coil inductance valuefrom its dimensions measurements it's given above I think there are many simple ways tofindout closer value, may you have an idea or method?Waiting for your creativity.Thank you.

author: eugene
author_rank: Frequent Contributor
timestamp: April 19, 2025, 01:08:47 pm
content: Why not just take the advice that was already offered?https://duckduckgo.com/?t=lm&q=inductance+of+coil+calculator&atb=v342-1&ia=web

author: yalect
author_rank: Regular Contributor
timestamp: April 21, 2025, 07:49:11 am
content: Thank you.I hope the calculators given above in the searche will give closer and right resulte, I try first one with my data in inches Unite.

author: OLderDan
author_rank: Regular Contributor
timestamp: April 23, 2025, 10:32:19 pm
content: do you have (access to) an oscilloscope?

author: yalect
author_rank: Regular Contributor
timestamp: April 24, 2025, 09:15:48 am
content: Thank you.at the moment no, but Maybe later.

author: D2236
author_rank: Regular Contributor
timestamp: April 25, 2025, 12:58:35 am
content: My calculator gives about 16.5 nH.

author: yalect
author_rank: Regular Contributor
timestamp: April 27, 2025, 08:14:52 am
content: Thank you.the 16.5 nH is the closer value that is supposed to be with using the measurements and the claculators above or there are another methods or some suggestions?.

author: yalect
author_rank: Regular Contributor
timestamp: August 25, 2025, 09:41:01 am
content: Hi,sorry, I want to make some modifcation for the subject thissmall coil inductor of Copperas following:Inside diametre d=2mm.Outside diametre D=3mm.Length or L= 2mm.Please,- may you can findout the inductance value from the Dimensions?.- can you can suggest a value?.Thank you.

author: MariuszD
author_rank: Regular Contributor
timestamp: August 25, 2025, 10:52:29 am
content: This is a very small inductance. In a real circuit, it can change significantly depending on the length of the leads and the proximity of metal components.You can place it in the target circuit and tune it to achieve the correct system parameters.

author: yalect
author_rank: Regular Contributor
timestamp: August 26, 2025, 07:44:27 am
content: Thank you,I think there are someideas or Methods based on dimensions?.Perahapes, someone tried the idea and getaccepted resultes?.Thanks.

author: MariuszD
author_rank: Regular Contributor
timestamp: August 26, 2025, 01:52:05 pm
content: What do you want to use this coil for?What do you mean by acceptable results? What is acceptable for you?

author: Alex Nikitin
author_rank: Super Contributor
timestamp: August 26, 2025, 06:44:00 pm
content: Quote from: yalect on April 18, 2025, 08:09:07 amDidn’t you already ask the same question about 10 years ago and received essentially the same answer?https://www.eevblog.com/forum/beginners/coil-value/msg622244/#msg622244CheersAlex

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 26, 2025, 07:51:45 pm
content: wow in ten years he could have at least bought an ARRL Handbook or something...

author: yalect
author_rank: Regular Contributor
timestamp: August 31, 2025, 10:50:37 am
content: Thank you for your reply and concern.

author: LM21
author_rank: Regular Contributor
timestamp: September 02, 2025, 06:31:49 pm
content: I would use NanoVNA to measure small coils. Websites are good but measuring an actual coil is better. This is probably goodhttps://hamwaves.com/inductance/en/index.html#inputand its source is interesting to read. But as I said you'd better measure it.But there seems to be other problems.