From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 10:16:57 2014 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 935B3147 for ; Sat, 29 Nov 2014 10:16:57 +0000 (UTC) Received: from nm28-vm4.bullet.mail.ir2.yahoo.com (nm28-vm4.bullet.mail.ir2.yahoo.com [212.82.97.64]) (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 D5A1234E for ; Sat, 29 Nov 2014 10:16:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s1024; t=1417256207; bh=vN42rKe6s+9uM3X1t0NKua165+tGV3bkzWnkNuOnl/U=; h=Date:From:To:Subject:In-Reply-To:References:From:Subject; b=Ia66htcOWVma81/nfEqgRo3AFIAR4mmd5Zt9A7e4RL7SVLHAzq11YbgnFFYvSu/ysnF2jdkQl/pY8eg5RvsvVPuTnli9Pn8NRm4gMk6kcrzZtjg0HtCpbSCabQX4Qk1w25FFPFkODOpnSR4GePzCujrccwWoM29hBSn7DvxCvVo= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rocketmail.com; b=n5KjL1D1KSD3779YSge8uKUqDbfs1ngJkyHYw5y9MEC9HeQ67nmUvctLYp+EGyxbzd0x0GfgjbvfyjjlYiBMGSOAXi+FqDvAgjdKB3uEa3B4+Tf+olyU8R7OP2tAw6eY5HNQei/ZXHhxQXWJ0RInFXATBSzRP4B4m9CeWQQHfL8=; Received: from [212.82.98.50] by nm28.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:16:47 -0000 Received: from [46.228.39.98] by tm3.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:16:47 -0000 Received: from [127.0.0.1] by smtp135.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 10:16:47 -0000 X-Yahoo-Newman-Id: 479742.59825.bm@smtp135.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: JyCSAU4VM1lkurlr69PjsWugg3DWuWZ.KmTKGN_5ZhjHsZV nsAfjCk6EoPZLZ6SHUc0YD8VRKr0OzBCoWMnQP6KtMogASJ6iMslD5dAdZlo pXAWHcv8Bwc6_nsxIJCwI9bHyxOnqJ73DqcG7q3OpOVb8R_l5Dt6SjGnk4Jp XCtgIB592dGTbDPFxqyTR9Mvt2WQ5Li4Haw3NvE89HKWTS1Df6FNEuh2bDB9 U_L7OmA6Frt4rOpyWAlqL7FCpEZMp9QvwXNJCZsP_qn6wq5xBUzRWvQCQ.BX qnDfXHJ0fpYCMraGyseZM0qp.GrJLOmlyP0PtL9uV9_TYF.W4Zi.xbI2t9Cn 5cqNXAXcuYFP8x2B4TWfJU2nnR9hDunxiZbT.04MNIu5DRHAgG_zKTLmJRa4 twyWLHqiy60Oie93UbQS7LFj1n874I1Pzxy_LVG46iL6waKggbt255jTDX4C 496eoqrCgGOvO4t.vpad81rUG4xJu9CiPoZ5alFsWeesc.vK7o0rMHzLo5GT 0sLYK3np.qDQtHFzOaySQXG2unwq4Ig-- X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Sat, 29 Nov 2014 11:16:46 +0100 From: Ralf Mardorf To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129111646.5c32dccd@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 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 10:16:57 -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 *?*