From owner-freebsd-questions@FreeBSD.ORG Sat Nov 29 09:44:56 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 DC000E54 for ; Sat, 29 Nov 2014 09:44:55 +0000 (UTC) Received: from nm39-vm2.bullet.mail.ir2.yahoo.com (nm39-vm2.bullet.mail.ir2.yahoo.com [212.82.97.161]) (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 29D9EC9 for ; Sat, 29 Nov 2014 09:44:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rocketmail.com; s=s1024; t=1417254287; bh=9GcWExOwddUIUAB7cr7el8HrffxfLzejD3C9pLAQ5zU=; h=Date:From:To:Subject:In-Reply-To:References:From:Subject; b=1E4ww3SyH/nTBJTc9hVWwzmYHOMBY84LzYRf+Tc3fg8GEzQ2F0dhn25h7GKlKHk1BWSKBcF5bzurZky9vnhsLH2xWOSy3u8XMDD4g0lVqxmQCTTDyHnbugOf3n+TzTHb6S7pd6VWwsoR8eIRbPgvA+a49HWuofomo3+01vCzx8c= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=rocketmail.com; b=Ps0/ODSzgiIz6Tuyq0Ln2Mxkhl2OWq5BEe/eoMYDDiqk8JWP396tEbw6by81Ao9mPpZM8KNkRgdThoWvopib4deraYE9LxtybWFsG9k+/fto5ECkeJR+BpwTTc6RBGoAl4h0CqlO+fu5LE5O71UeGK4R2CUuvJOK2OF6FqulMjU=; Received: from [212.82.98.61] by nm39.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 09:44:47 -0000 Received: from [46.228.39.87] by tm14.bullet.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 09:44:47 -0000 Received: from [127.0.0.1] by smtp124.mail.ir2.yahoo.com with NNFMP; 29 Nov 2014 09:44:47 -0000 X-Yahoo-Newman-Id: 134000.730.bm@smtp124.mail.ir2.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: SYEGz5QVM1lMETE8hPu6J8QGMDBCOV4uJ5vxTRmnNOl4hyG 5tLAwjd5sT83vQj.9PvbP3UP6u1IVxfCcuvpdzIJNEwP1txMtIFCQa7tL5Mb lBkB__GEFRDSIo6ZL3uOchlghs1zY0nR0NVeNu9vgrIMaeM_2C9gq1BQTvvF lWUrBuSrmviT3RXR5eZpDgdb3QwgLJ2ltan.WflbG.hUFTzflz4BOV9twdo3 t__G.tHP8D1q5k6yvWhTQAoQRIQsanZNPOpLKuIoh3z3w9x8aCADRkX219RU 8vC5JDWjBKokc4nzxK5WmZUTA02USHkZwGycnxBiV6QuZMsZ2zFBc4JQemSx 7daDkKAgGEfID1_DhjVIKV2vPYWu6RBeVQrJsmiWt6UOJpwBfYJdzewqteUz qJi2CVpylxaolJcaUnsY5IKEAc6R6CqIUeIgujcHWS8bxRRUs4LA4iFHmEeu kCeaHvevz3MOvfRd0rIvjkgQKBbyc.JGGw6Bc.pReSk3WjSU65W5Yp_rjrFy zWOjW7IyiQz0kgB.bfShWbktihGmBnlv5tcJRZjP407gJRIupqoVpnY8ZvXF QOu4zN9o- X-Yahoo-SMTP: BeMCPs2swBABTJ3kAeEiC_hE0mz8jRexLddJfD8pI2j32fOacjBmXg-- Date: Sat, 29 Nov 2014 10:44:46 +0100 From: Ralf Mardorf To: freebsd-questions@freebsd.org Subject: Re: [Bulk] Re: OT: UPS for FreeBSD Message-ID: <20141129104446.7850b1b4@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 09:44:56 -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 > > battery1 ==> regulator ==> 12VDC > > battery2 ==> regulator ==> 5VDC > > IOW the computer runs off the batteries, which are charged by the > stepped-down but unregulated (or minimally-regulated) line voltage. And that already is done and is one design I was thinking about, but I called it the wrong name, Wiki likely knows what the correct name for this design is. As a side effect this is a good mains filter. Another design is possible, perhaps enlarging the lifespan of the batteries, because they are only used when needed and using a switching power supply should be possible too. Regards, Ralf PS: I wonder if consumers are aware that lightning arresters provided by multi-outlet power strips alone don't protect. The protection needs 3 steps, 2 steps must be provided by the buildings electric. The lightning arresters provided by multi-outlet power strips is just the last step, useless without the 2 other steps. Lightning protection in Germany is much more needed, than protection in case of a blackout.