Return-Path: Received: (qmail 19723 invoked from network); 16 Jan 2005 22:04:40 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 16 Jan 2005 22:04:38 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CqIRv-000LUo-Af for dave@picks.force9.co.uk; Sun, 16 Jan 2005 22:00:45 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CqIRv-000LUl-85 for dave@picks.force9.co.uk; Sun, 16 Jan 2005 22:00:43 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CqIVg-000D8s-FU for dave@picks.force9.co.uk; Sun, 16 Jan 2005 22:04:36 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CqIUS-0006Y2-1k for rs_out_1@blacksheep.org; Sun, 16 Jan 2005 22:03:20 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CqIUR-0006Xt-MQ for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 22:03:19 +0000 Received: from smtpout01-04.mesa1.secureserver.net ([64.202.165.79]) by relay.thorcom.net with smtp (Exim 4.43) id 1CqIUP-0005Fk-1g for rsgb_lf_group@blacksheep.org; Sun, 16 Jan 2005 22:03:19 +0000 Received: (qmail 20187 invoked from network); 16 Jan 2005 22:03:00 -0000 Received: from unknown (68.116.172.18) by smtpout01-04.mesa1.secureserver.net (64.202.165.79) with ESMTP; 16 Jan 2005 22:03:00 -0000 Message-ID: <007001c4fc17$0d75fc60$0500a8c0@charter.net> From: "John Andrews" To: rsgb_lf_group@blacksheep.org References: <005801c4fc0a$c5526380$0500a8c0@charter.net> <41EADCD8.1050806@freenet.de> Date: Sun, 16 Jan 2005 22:02:20 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-SPF-Result: relay.thorcom.net: 64.202.165.79 is neither permitted nor denied by domain of w1tag.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: LF: Image-Cancelling Exciter Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Wolf, > Was the L.O. using 74AC74 + 74AC08 better than the simple 74 HC 107 method ? No! I had done the 74/08 section before you produced the schematic for the HC107. It is simpler. Is that dual-JK version fairly glitch-free? One other note at this point. I attempted to use a CD4017B, but it just wasn't fast enough to provide good carrier and sideband suppression. This is definitely a project for HC or AC logic. > ...and one suggestion: > To eliminate the need to adjust the offset voltage for the 4 input > opamps, simply use AC-coupling. I found this very cute to reduce the > number of trimpots to the minimum (namely zero)... Yes, but I wondered if the switch operation would be cleaner without the charging and discharging of the caps. I can put some in there and see if it makes a difference. Stay tuned! Available playing time is limited this week... John