Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Jeroen Belleman <jeroen@nospam.please>
Newsgroups: sci.electronics.design
Subject: Re: those coupled drum core inductors
Date: Sun, 16 Mar 2025 20:30:24 +0100
Organization: A noiseless patient Spider
Lines: 14
Message-ID: <vr78sg$2ctvq$1@dont-email.me>
References: <12kdtjt5en2kc3fh88aokn0kr54mvdq2f5@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Sun, 16 Mar 2025 20:30:24 +0100 (CET)
Injection-Info: dont-email.me; posting-host="ce2b46b594d23845aaad7de5e79b8cd4";
	logging-data="2521082"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX19KEkjSc2wTmgV+53c+AHIv"
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.13.0
Cancel-Lock: sha1:K6x1bl0WtXhRcBuWXQPz3RFtRs4=
In-Reply-To: <12kdtjt5en2kc3fh88aokn0kr54mvdq2f5@4ax.com>
Content-Language: en-US, fr-FR, nl-NL

On 3/16/25 15:15, john larkin wrote:
> 
> 
> https://www.dropbox.com/scl/fi/cd8gxmlrar3kvv3iz36xe/Mu_twin.jpg?rlkey=dvl8e7fbtjnzz3l9q9urkyyfn&raw=1
> 
> https://www.dropbox.com/scl/fi/nm1ksdn7eufm90ol0b0ec/Murata_Coupled_1.jpg?rlkey=e7yvk464xupz4axy7lt6zj3zk&raw=1
> 
> I was surprised to get K=0.6 by just putting them along side.
> 

That's somewhat surprising, indeed. Are the cores dumbbell-shaped?
Does the coupling vary steeply with the spacing?

Jeroen Belleman