Return-Path: Received: (qmail 9505 invoked from network); 13 Jun 2001 07:51:19 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 13 Jun 2001 07:51:19 -0000 Received: (qmail 12937 invoked from network); 13 Jun 2001 07:51:02 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 13 Jun 2001 07:51:02 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15A5L4-0004p8-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 13 Jun 2001 08:45:18 +0100 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15A5L3-0004p3-00 for rsgb_lf_group@blacksheep.org; Wed, 13 Jun 2001 08:45:17 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id IAA25195; Wed, 13 Jun 2001 08:49:26 +0100 (BST) Received: (qmail 27884 invoked from network); 13 Jun 2001 08:37:59 -0000 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 13 Jun 2001 08:37:59 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: by gauntlet.mail.dera.gov.uk; id IAA06831; Wed, 13 Jun 2001 08:29:38 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma006768; Wed, 13 Jun 01 08:29:15 GMT Received: from mailex.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with SMTP id for ; Wed, 13 Jun 2001 08:53:07 +0100 Received: (qmail 15966 invoked from network); 13 Jun 2001 07:34:43 +0100 Received: from softdnserror (HELO cchecker.dstl.gov.uk) (192.168.248.52) by mailex.dstl.gov.uk with SMTP; 13 Jun 2001 06:34:43 -0000 Received: from FRN-MAIL-R1.dstl.gov.uk (unverified) by cchecker.dstl.gov.uk (Content Technologies SMTPRS 4.1.2) with ESMTP id for ; Wed, 13 Jun 2001 07:35:10 +0100 Received: by frn-mail-r1.dstl.gov.uk with Internet Mail Service (5.5.2650.21) id ; Wed, 13 Jun 2001 08:43:39 +0100 Message-ID: <7D653C9C42F5D411A27C00508BF8803D55C4CE@pdw-mail-r1.dstl.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: RE: LF: RE: 73kHz tests tonight Date: Wed, 13 Jun 2001 08:43:43 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: One option would be to use the TC4428 driver chip. This has one inverting and one non inverting driver. Drive both inputs in parallel and connect the FET driver transformer primary, now with twice as many turns, between both outputs. That way you can double the drive capability without running into the problems with the unequal switching times that can give trouble when trying to parallel up two devices with totem pole outputs Andy G4JNT > -----Original Message----- > From: James Moritz [mailto:j.r.moritz@herts.ac.uk] > Only real problem so far was getting the gate driver to work - even > with both sections of a TC4427 driver IC in parallel, the drive > waveform had rather slow edges when feeding the 4 large- > geometry FETs in parallel, > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.