Return-Path: X-Spam-DCC: paranoid 1181; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u0DIrkCH011905 for ; Wed, 13 Jan 2016 19:53:47 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aJQUK-0000gb-ES for rs_out_1@blacksheep.org; Wed, 13 Jan 2016 18:49:44 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aJQUK-0000gR-5t for rsgb_lf_group@blacksheep.org; Wed, 13 Jan 2016 18:49:44 +0000 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1aJQTH-0000EB-Tb for rsgb_lf_group@blacksheep.org; Wed, 13 Jan 2016 18:49:43 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A2DSBACJmpZWPKyNH1wNURkBAQIPAQEBAYRJhmGBebUJhH+BEAKCCAEBAQEBAQcBAQEBQTSEPwEBAQECASNmCxoCHwcCAkMLCQYTiBkDCq81cY0XDIMVAQEBAQEFAQEBAQEBAQEBGoEBh2SCcIQ6G4MfLoEbBZcViDeUI4NGixCDLoFAcoYcAQEB X-IPAS-Result: A2DSBACJmpZWPKyNH1wNURkBAQIPAQEBAYRJhmGBebUJhH+BEAKCCAEBAQEBAQcBAQEBQTSEPwEBAQECASNmCxoCHwcCAkMLCQYTiBkDCq81cY0XDIMVAQEBAQEFAQEBAQEBAQEBGoEBh2SCcIQ6G4MfLoEbBZcViDeUI4NGixCDLoFAcoYcAQEB X-IronPort-AV: E=Sophos;i="5.22,290,1449532800"; d="scan'208";a="831452457" Received: from host-92-31-141-172.as13285.net (HELO [192.168.1.4]) ([92.31.141.172]) by out1.ip01ir2.opaltelecom.net with ESMTP; 13 Jan 2016 18:48:22 +0000 References: <5694071F.2000706@freenet.de> <6F658A0C-E347-4C74-872F-8DEE7B6CC0EE@talktalk.net> <56943BDE.3060201@freenet.de> <6D2C8500-0E97-42DA-AB21-D41F46E72D3C@talktalk.net> <5696947A.60906@freenet.de> From: Mal Hamilton X-Mailer: iPhone Mail (10B500) In-Reply-To: <5696947A.60906@freenet.de> Message-Id: <423D27C4-2ED2-493C-A92E-9DFE199EC50A@talktalk.net> Date: Wed, 13 Jan 2016 18:48:22 +0000 To: "rsgb_lf_group@blacksheep.org" Mime-Version: 1.0 (1.0) X-Scan-Signature: 5c335215f1b3de26d890ee84d49616ce Subject: Re: LF: FW: powered down from "4" to "2" on IC706mk2G due to interference with home routers es QRM from XYL es kids Content-Type: text/plain; charset=utf-8 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id u0DIrkCH011905 Status: O X-Status: X-Keywords: X-UID: 6307 I have an ad844 available Need to change 706 sine wave to sq wave to drive my Decca class D amp Need 7v p-p also clean the sig up Mal/g3kev Sent from my iPhone On 13 Jan 2016, at 18:16, Wolfgang Büscher wrote: > > > Am 12.01.2016 um 22:34 schrieb Mal Hamilton: >> Wolf >> What is the comparater chip u use >> to conv 706 sine wave to sq wave >> Mal/g3kev > an antique NE529 (in the *switching mode linear* as described on my website). I only used it because it was in the junk box, but would not recommend them for a new design if you had to order parts. The three supply voltages are a plague, especially the negative 'analog' supply. Use a modern rail-to-rail comparator with a few nanoseconds, for example LT1016. > > If I was to build such a PA again, I would now use a simple linear regulator instead of the switching-mode DC modulator, since *most* of the time the output amplitude is near 'full power' anyway. > Or use a dsPIC to provide the control signals for the RF driver and the modulator instead of the 'mass grave' of digital gates. > > 73, > Wolf . >