From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 10:30:29 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 6A852334 for ; Sat, 29 Nov 2014 10:30:29 +0000 (UTC) Received: from nm36-vm6.bullet.mail.ir2.yahoo.com (nm36-vm6.bullet.mail.ir2.yahoo.com [212.82.97.138]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id ABA7160F for ; Sat, 29 Nov 2014 10:30:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s1024; t=1417257019; bh=vN42rKe6s+9uM3X1t0NKua165+tGV3bkzWnkNuOnl/U=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From:Subject; b=m25PjEVhbDRMOVFVagLaTgaFumutQugUgLYYEFZqYMAPlKezIadxNiX9fKsgvDxqvwpUkma75g9RX0nu2lifMtOY5H9Y55J0kfUmtsadyZoTGB4DAxQ9mXv0O2UPOAwQkae8SYlxs4y1MFrkcShcLg9MGJ193f447soOYvloa6c= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rocketmail.com; b=Ugnjz7PMlJjAiac3efdpJyplBtSVohISJWQbnPhxLfbMohtQ5JFadHQVAA1VgkALE4e1JgigthvPJa4dWCY/w4vTqEStVaGvkt9GRRJsk11/MsQ5mdHYdlWNljYt+5s62lqXCAR4zzFH+28ihR/sGLxEAfQmE1IRguZX4sm6fIA=; Received: from [212.82.98.58] by nm36.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:30:19 -0000 Received: from [46.228.39.82] by tm11.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:30:19 -0000 Received: from [127.0.0.1] by smtp119.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:30:19 -0000 X-Yahoo-Newman-Id: 738976.30264.bm@smtp119.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: wx1VJckVM1mbdFIj36f99Lnao.SauxglsZEpuOe_o6VKY_q bif_VF7yI7vxKgMG5F5b4K9mVTalQ7w5txNKSm7ds58UMCFEsVB8UNEP53.m XFYXOfSZdTnjyrL9xMmf5yhLZGjtE4IpCilyNobMTS5CCpIYHsH.b.3DaaRe PmEcWy5mRC3OHdC.5VypsVWoGDIOR7gfaGPewuNZlsHYpsyosDUYawrd7UFE 911BoopbSCBbMJ17FX4p_gGPSzEXqJIUfDcI16bGzTfIXmSj2Dyw.RkXl5pn cL3VgUjbp8hdJDR_5QSEXkzvLknPucc5C7E.Km7q.OfQnAt6EiO4UvVKzF1d 1mChMmwmsd1WNyCTArxnTFCmqdOciLdP56Zb7o1zbsOiHeetYuB.2PuBc9LU VcO2JHa5sTaQJ49M9I7vZZEjPuECXAf8ItqIWvriV5cOCvDEgz9F7f5JJCOE iDpZZzruNCnAK2tKe3eLpJWwKwdTNkZbuaFBxxDDLxqeX3CFy_C0buCqwSd8 WPd5BYX370DOQ5Y97.sWdSB_VgdT7LA-- X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Sat, 29 Nov 2014 11:30:18 +0100 From: Ralf Mardorf To: perryh@pluto.rain.com (Perry Hutchison) Subject: Re: OT: UPS for FreeBSD Message-ID: <20141129113018.17759e2a@archlinux> In-Reply-To: <54798883.saa13h6lE6rPwZCf%perryh@pluto.rain.com> References: <54777AB1.9010800@bluerosetech.com> <54779629.302@bluerosetech.com> <5478BD4F.7020306@yahoo.com> <5478BEE6.30308@bluerosetech.com> <5478CC08.9090307@yahoo.com> <20141128204722.561f948e@archlinux> <5478F16A.80605@yahoo.com> <54791d3a.w/pI0kak03d+3nKC%perryh@pluto.rain.com> <20141129113405.3d1bd1d6@X220.alogt.com> <54798883.saa13h6lE6rPwZCf%perryh@pluto.rain.com> X-Mailer: Claws Mail 3.11.1-34-g5c904ff (GTK+ 2.24.25; x86_64-arch-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: erichsfreebsdlist@alogt.com, kudzu@tenebras.com, freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Nov 2014 10:30:29 -0000 On Sat, 29 Nov 2014 00:49:07 -0800 perryh@pluto.rain.com (Perry Hutchison) wrote: > multitapped > 120VAC ==> step-down ==> 6VAC ==> full-wave ==> ~15VDC ==> battery1 > transformer rectifier > | > +---> 3VAC ==> full-wave ==> ~7.5VDC ==> battery2 > rectifier Now I'm confused. The ratio should be around 1.41, the square root of 2 "-" 1.5V assumed it's a diode bridge rectifier. E.g. 10 VAC * 1,41 = 14,1 14,1 - 1,5 = 12,6 VDC *?*