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The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Greetings all, Does anyone have old databooks of Siemens (now Epcos) ferrite materials at hand ? I'm looking for information of N28 material, after discovering a bunch of pot cores in the junkbox. 25 mm diameter, 16 mm height, and an AL value of approx. 1 uH per turn squared. The label carries the 'Siemens and Halske' logo, so these cores must be quite old. [...] Content analysis details: (-0.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [195.4.92.92 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dl4yhf[at]freenet.de) -0.4 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: LF: N28 ferrite material useable on MF ? Content-Type: text/plain; charset=ISO-8859-15; format=flowed 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=0.0 required=5.0 tests=none 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 Status: O X-Status: X-Keywords: X-UID: 572 Greetings all, Does anyone have old databooks of Siemens (now Epcos) ferrite materials at hand ? I'm looking for information of N28 material, after discovering a bunch of pot cores in the junkbox. 25 mm diameter, 16 mm height, and an AL value of approx. 1 uH per turn squared. The label carries the 'Siemens and Halske' logo, so these cores must be quite old. The plan is to use one of them as transformer to feed the gate of a MOSFET which requires floating ground (source not connected to GND, but to the drain of another MOSFET). Is this old N28 material usable at a few hundred kHz, and what about the max flux in the core / max density / saturation ? Best regards, Wolf DL4YHF .