X-GM-THRID: 1232221858640183843 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.115.73.6 with SMTP id a6cs245955wal; Wed, 28 Mar 2007 20:18:59 -0700 (PDT) Received: by 10.67.90.1 with SMTP id s1mr865825ugl.1175138338843; Wed, 28 Mar 2007 20:18:58 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 28si1274915ugc.2007.03.28.20.18.51; Wed, 28 Mar 2007 20:18:58 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1HWl6P-00010p-Qb for rs_out_1@blacksheep.org; Thu, 29 Mar 2007 04:15:05 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1HWl6P-00010g-9I for rsgb_lf_group@blacksheep.org; Thu, 29 Mar 2007 04:15:05 +0100 Received: from yk-mlwprd2.northwestel.ca ([198.235.201.13]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1HWl6O-0007qC-Ac for rsgb_lf_group@blacksheep.org; Thu, 29 Mar 2007 04:15:05 +0100 X-ASG-Debug-ID: 1175138102-109e00000000-a32kfu X-Barracuda-URL: http://198.235.201.13:8000/cgi-bin/mark.cgi X-Barracuda-Connect: whthyt235-40.northwestel.net[207.189.235.40] X-Barracuda-Start-Time: 1175138102 Received: from VY1JA (whthyt235-40.northwestel.net [207.189.235.40]) by yk-mlwprd2.northwestel.ca (Spam Firewall) with SMTP id 1FA901D9CDA for ; Wed, 28 Mar 2007 21:15:02 -0600 (MDT) Message-ID: <001501c771b0$709f0140$0301a8c0@VY1JA> From: "J. Allen" To: "LF \(RSGB\)" X-ASG-Orig-Subj: Why 34nb20 blocking cap? Date: Thu, 29 Mar 2007 03:15:01 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Barracuda-Virus-Scanned: by Barracuda Spam Firewall at northwestel.ca X-Barracuda-Spam-Score: 0.50 X-Barracuda-Spam-Status: No, SCORE=0.50 using global scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=6.8 tests=BSF_RULE7568M X-Barracuda-Spam-Report: Code version 3.1, rules version 3.1.12597 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- 0.50 BSF_RULE7568M BODY: Custom Rule 7568M X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Why 34nb20 blocking cap? Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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 Status: O X-Status: X-Keywords: X-UID: 3994 Hello Tech types. While I am working on the amp, I noticed that some of the FET drive circuits are fed directly from a driver device (G3YXM circuit p66 LF Today) and some use a blocking capacitor followed by a diode (G0MRF circuit, p72). Why are the capacitors and diodes required in one FET circuit and not in the other? Thanks, J.