Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w43E6tH0007583 for ; Thu, 3 May 2018 16:06:58 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fEEmv-0004RH-9L for rs_out_1@blacksheep.org; Thu, 03 May 2018 15:00:49 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fEEmn-0004R4-NA for rsgb_lf_group@blacksheep.org; Thu, 03 May 2018 15:00:41 +0100 Received: from mail-wm0-x232.google.com ([2a00:1450:400c:c09::232]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1fEEmj-0001RN-Bl for rsgb_lf_group@blacksheep.org; Thu, 03 May 2018 15:00:40 +0100 Received: by mail-wm0-x232.google.com with SMTP id n10so30497921wmc.1 for ; Thu, 03 May 2018 07:00:37 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=LdAsl7rjVeYzg+vLmAiy+7e3TSduN7O5vB5W/UJCLMA=; b=VbzZ6VAUiOEQDAWwBiPnBiGB/9R/IMg5GUdE11jgYCcEh91QI9TzoaUx0SaVxyeAvr BfbStn9aDgQZHvzZvdE4qfj/hTfPUKgsDDOnfhFnb1jNqi4gq1Ieeok2CBjVhyxX9szk 8MYHCK0Vyw1Nr5AAQYmGPIZIgsRxrGor54YyhdTdSgei2rSC2i8clIWbLK2rZRdjQQ7N d31KhwiLHkllFpxqoiZr2SVCJMRla8hRcaoozeArd19xE1iYreoD1su5DK/52dGE1ao8 Mw0y/7rdknnYV4t6AKRNlmG0HxRJp9wabJPq0XaeXyMBEjchfP9EU6LCeXHb6qu73J17 8x8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=LdAsl7rjVeYzg+vLmAiy+7e3TSduN7O5vB5W/UJCLMA=; b=BVi3Nc4R0/D0wvvOJGXo2dojuxxb1F0graqITVR4Yq6GsdZWOzZpqrMUw0jPva+aQP Syy6yGskEHw1hhp8dB4WBDlltlHY/NsBwDR6DgNfFfRpRtY/LketOFB4rc5eLsKRIJXW N+YnRmdSe9C/ZYpS+fo++220xGO80FRjZ2/iSmJDctIo7oDlFXCwpZQs5LWPOE21BBFi 1UialjXiLcL7XJJVFESf9Lgybyz7wj0dCGhGtLhzg6f3tcvi6WNksb9KhW2wD2Z4bnpW tOYzSSVXxsQRe2idIfpBDvkkkDCmjIT2GXcCwptmAJyPr4rzOt67e6Xy7xL7MGznleBO nvyQ== X-Gm-Message-State: ALQs6tBmhC/ujoZVe9gwWQsnSdGtSC3g7uH84qi2LS8O6ACvVB8NsOr+ 0o5lP9ee4Uycx1aeQh2ds9zHH/ZyJehRuNdgZQU= X-Google-Smtp-Source: AB8JxZq4EtGxZhYygr/hIMpN2phswJ+6Ijp7/X4szJTt0zTu05JX5smxIB69HmXwx/PhQIQ+KV+nl18DR111mro5PRU= X-Received: by 2002:a50:ba43:: with SMTP id 3-v6mr31635356eds.194.1525356036386; Thu, 03 May 2018 07:00:36 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.159.130 with HTTP; Thu, 3 May 2018 07:00:36 -0700 (PDT) In-Reply-To: <376794419.20180503144640@gmail.com> References: <376794419.20180503144640@gmail.com> From: Andy Talbot Date: Thu, 3 May 2018 15:00:36 +0100 Message-ID: To: LineOne X-Spam-Score: 1.0 (+) 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: By measuring the voltage across the winding using a scope, then seeing what Bmax is using teh equation Vrms = 4.44.F.N.A.B F Hz N turns A core cross-sectional area in metres^2 B tesla [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.0 FREEMAIL_REPLY From and body contain different freemails X-Scan-Signature: 4d97240a623a26620214cd27feaa9f71 Subject: Re: LF: How can you tell if a Class D amp output transformer is starting to saturate? Content-Type: multipart/alternative; boundary="000000000000b47f36056b4da0fe" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE 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 --000000000000b47f36056b4da0fe Content-Type: text/plain; charset="UTF-8" By measuring the voltage across the winding using a scope, then seeing what Bmax is using teh equation Vrms = 4.44.F.N.A.B F Hz N turns A core cross-sectional area in metres^2 B tesla If B works out higher than about 0.1 for a ferrite core, then you are approaching saturation Andy www.g4jnt.com On 3 May 2018 at 14:46, Chris Wilson wrote: > > > Hello LF'ers > > In say a W1VD power amp, or in general, how can you test if the output > transformer is > starting to saturate please? Thanks. > > http://www.w1vd.com/137-500-KWTX.html > > > > -- > Best regards, > Chris mailto:dead.fets@gmail.com > > > --000000000000b47f36056b4da0fe Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
By measuring the voltage across the winding using a scope,= then seeing what Bmax is using teh equation

Vrms =3D 4.= 44.F.N.A.B

F Hz=C2=A0 =C2=A0 =C2=A0N turns=C2=A0 = =C2=A0A core cross-sectional area in metres^2=C2=A0 =C2=A0 B tesla

If B works out higher than about 0.1 for a ferrite core, t= hen you are approaching saturation

On 3 May 2018 at 14:46, Chris Wilson <dea= d.fets@gmail.com> wrote:

Hello LF'ers

In=C2=A0 say a W1VD power amp, or in general, how can you test if the outpu= t transformer is
starting to saturate please? Thanks.

http://www.w1vd.com/137-500-KWTX.html



--
Best regards,
=C2=A0Chris=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 mailto:d= ead.fets@gmail.com



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