Return-Path: Received: from mtain-mc12.r1000.mx.aol.com (mtain-mc12.r1000.mx.aol.com [172.29.96.84]) by air-mc01.mail.aol.com (v127_r1.1) with ESMTP id MAILINMC014-a8ce4b86821c4f; Thu, 25 Feb 2010 08:58:52 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc12.r1000.mx.aol.com (Internet Inbound) with ESMTP id 863E338000106; Thu, 25 Feb 2010 08:58:51 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NkeDb-0004Is-3N for rs_out_1@blacksheep.org; Thu, 25 Feb 2010 13:57:31 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NkeDa-0004Ij-MP for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 13:57:30 +0000 Received: from smtp-vbr18.xs4all.nl ([194.109.24.38]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NkeDY-0005Cx-3I for rsgb_lf_group@blacksheep.org; Thu, 25 Feb 2010 13:57:30 +0000 Received: from pc1 (ndb.demon.nl [82.161.81.65]) by smtp-vbr18.xs4all.nl (8.13.8/8.13.8) with ESMTP id o1PDvEwW098920 for ; Thu, 25 Feb 2010 14:57:27 +0100 (CET) (envelope-from roelof@ndb.demon.nl) Date: Thu, 25 Feb 2010 13:57:02 -0000 To: rsgb_lf_group@blacksheep.org From: "Roelof Bakker" MIME-Version: 1.0 References: <818138.8525.qm@web28102.mail.ukl.yahoo.com> <38A51B74B884D74083D7950AD0DD85E82A1B1A@File-Server-HST.hst.e-technik.tu-darmstadt.de> Message-ID: In-Reply-To: User-Agent: Opera Mail/9.63 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: AW: LF: RE: Re: VLF_8.79 kHz Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-15 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d60544b86821b49c9 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hello Andy, The equivelent length is 30 cm, representing about 2-3 pF. The buffer amp is using a J310 with a 1.5 M gate resistor. Using bootstrap techniques, one can achieve a very low input capacitance. However this results in even more signal and noise output, especially at VLF. So it is not used here. 73, Roelof