Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id F11BA380000A1; Sun, 25 Mar 2012 13:26:56 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SBrCE-0001lr-1n for rs_out_1@blacksheep.org; Sun, 25 Mar 2012 18:25:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SBrCD-0001li-JV for rsgb_lf_group@blacksheep.org; Sun, 25 Mar 2012 18:25:37 +0100 Received: from smtp-vbr5.xs4all.nl ([194.109.24.25]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SBrCA-0007P7-V4 for rsgb_lf_group@blacksheep.org; Sun, 25 Mar 2012 18:25:37 +0100 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr5.xs4all.nl (8.13.8/8.13.8) with ESMTP id q2PHPTCr076765 for ; Sun, 25 Mar 2012 19:25:34 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <1FFFC71EA0BE4176BEFFBF7D095D3BA9@Extensa> <4106A79FDAE74690B0A2C710BDA51B55@Extensa> Date: Sun, 25 Mar 2012 19:25:27 +0200 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <4106A79FDAE74690B0A2C710BDA51B55@Extensa> User-Agent: Opera Mail/11.61 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz ! 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-SCOLL-SCORE: 0:2:322947584:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4054f6f556048e2 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hello Peter, Some power supplies are particular noisy. I use a wall wart type with a transformer (no switching type). But again as you found out, noise differs from one model to the other. It is a pity that wall warts with transformers are now banned in the EU. It gets exceedingly difficult to source them. Peter, which transistor are you using for the emitter follower? 73, Roelof, pa0rdt