Return-Path: Received: (qmail 59600 invoked from network); 21 Jan 2004 13:52:46 -0000 Received: from unknown (HELO ptb-mxscan03.plus.net) (212.159.14.237) by ptb-mailstore02.plus.net with SMTP; 21 Jan 2004 13:52:46 -0000 Received: (qmail 77146 invoked from network); 21 Jan 2004 13:52:46 -0000 Content-Transfer-Encoding: 8bit X-Filtered-by: Plusnet (hmail v1.01) X-Priority: 3 X-MSMail-Priority: Normal X-Spam-detection-level: 11 Received: from ptb-mxcore03.plus.net (212.159.14.217) by ptb-mxscan03.plus.net with SMTP; 21 Jan 2004 13:52:44 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1AjImi-000JqN-Cy for dave@picks.force9.co.uk; Wed, 21 Jan 2004 13:52:44 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AjIlm-0007U2-Sd for rs_out@blacksheep.org; Wed, 21 Jan 2004 13:51:46 +0000 Received: from [134.153.232.16] (helo=cupids.ucs.mun.ca) by post.thorcom.com with esmtp (Exim 4.14) id 1AjIlj-0007Tt-IN for rsgb_lf_group@blacksheep.org; Wed, 21 Jan 2004 13:51:43 +0000 Received: from plato.ucs.mun.ca (root@plato.ucs.mun.ca [134.153.232.151]) by cupids.ucs.mun.ca (8.12.9p1/8.12.9) with ESMTP id i0LDpcFZ070297 for ; Wed, 21 Jan 2004 10:21:39 -0330 (NST) (envelope-from jcraig@morgan.ucs.mun.ca) Received: from plato.ucs.mun.ca (jcraig@localhost [127.0.0.1]) by plato.ucs.mun.ca (8.12.3p2/8.12.3) with ESMTP id i0LDpWgj000324 for ; Wed, 21 Jan 2004 10:21:38 -0330 (NST) Received: (from jcraig@localhost) by plato.ucs.mun.ca (8.12.3p2/8.12.1/Submit) id i0LDpQ1g001320; Wed, 21 Jan 2004 10:21:26 -0330 (NST) Date: Wed, 21 Jan 2004 10:21:25 -0330 (NST) From: "Joe Craig" X-X-Sender: jcraig@plato.ucs.mun.ca To: "LF-Group" In-reply-to: <001301c3dfbe$cc459b80$6507a8c0@Main> Message-ID: References: <001301c3dfbe$cc459b80$6507a8c0@Main> MIME-Version: 1.0 Subject: Re: LF: re TC44 etc Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 On Wed, 21 Jan 2004, Alan Melia wrote: > Hi Dick, it is not really all that necessary to use that chip. It is quite > possible to drive the gates quite adequately with a PNP-NPN totem pair > (emitter followers...the emitters to the output ...npn top pnp I've been using this method to drive an IFR640 for almost a year. The gate voltage is a bit dirty, but the output seems fine. I'm using Class E per Alan's spreadsheet design. Joe