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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id m15sm1307464wrb.58.2018.03.09.07.20.57 (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 09 Mar 2018 07:20:57 -0800 (PST) Date: Fri, 9 Mar 2018 15:20:56 +0000 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <1771441773.20180309152056@gmail.com> To: N1BUG CC: dead.fets@gmail.com In-Reply-To: <39ce3e50-36a5-772b-3e82-3f36b5704587@n1bug.com> References: <5710661673.20180308173705@gmail.com> <39ce3e50-36a5-772b-3e82-3f36b5704587@n1bug.com> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello N1BUG, The core, being dust iron, must have good heat transfer, so i would expect the whole core would heat to much the same temperature, even if the wire itself was the source of the heat. Can you lift the core on longer extension leads of the same wire and see if the extensions heat up? [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: Re: LF: A different inductor heating question Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Hello N1BUG, The core, being dust iron, must have good heat transfer, so i would expect the whole core would heat to much the same temperature, even if the wire itself was the source of the heat. Can you lift the core on longer extension leads of the same wire and see if the extensions heat up? Friday, March 9, 2018, 1:29:48 PM, you wrote: > Thanks Chris, > I think the wire NOT wound on the toroid is warming also, but it is > difficult to know. The leads are very short and soldered to large > pads on the circuit board which tend to act as a heat sink. I don't > have a thermocouple and I can only just get the tip of a finger onto > those short leads. > Barring someone explaining otherwise, my assumption remains that > core heating must heat the whole core, including any portion which > does not have windings around it. But, I've been wrong before... ;-) > Paul -- Best regards, Chris mailto:dead.fets@gmail.com