Return-Path: Received: from rly-df08.mx.aol.com (rly-df08.mail.aol.com [172.19.156.21]) by air-df06.mail.aol.com (v121_r4.6) with ESMTP id MAILINDF061-56d4937049a297; Wed, 03 Dec 2008 17:15:50 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df08.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDF084-56d4937049a297; Wed, 03 Dec 2008 17:14:11 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1L7zsD-0000b2-PR for rs_out_1@blacksheep.org; Wed, 03 Dec 2008 22:07:09 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1L7zsB-0000at-1l for rsgb_lf_group@blacksheep.org; Wed, 03 Dec 2008 22:07:07 +0000 Received: from mhost01c.leeds.ac.uk ([129.11.76.209]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1L7zs0-0003BD-PH for rsgb_lf_group@blacksheep.org; Wed, 03 Dec 2008 22:07:07 +0000 Received: from dexbr2.ds.leeds.ac.uk (dexbr2.leeds.ac.uk [129.11.76.20]) by mhost01c.leeds.ac.uk (8.14.3/8.14.3) with ESMTP id mB3M6OrU021981 for ; Wed, 3 Dec 2008 22:06:24 GMT Received: from HERMES4.ds.leeds.ac.uk ([129.11.5.130]) by dexbr2.ds.leeds.ac.uk with Microsoft SMTPSVC(6.0.3790.1830); Wed, 3 Dec 2008 22:06:25 +0000 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Date: Wed, 3 Dec 2008 22:06:23 -0000 Message-ID: <731EB49F88B309428FFDDD2423F810E441C395@HERMES4.ds.leeds.ac.uk> X-MS-Has-Attach: X-MS-TNEF-Correlator: <731EB49F88B309428FFDDD2423F810E441C395@HERMES4.ds.leeds.ac.uk> thread-topic: LF: DEGEN 1103...Simple RX Loop info Thread-Index: AclViZ0bYIz7JONDTSusoTUkq4FStgAB9ap2 References: <004301c9549b$d0f65b40$0301a8c0@mal769a60aa920> <001601c954a2$867a58d0$6401a8c0@asus> <49357311.2090801@yahoo.com> <004301c95530$804a8b90$0301a8c0@mal769a60aa920> <4936BA2F.10309@yahoo.com> <00b001c95582$2f52e140$0301a8c0@mal769a60aa920> From: "Chris Trayner" To: X-OriginalArrivalTime: 03 Dec 2008 22:06:25.0080 (UTC) FILETIME=[6213FB80:01C95593] X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C95593.61432512" Subject: RE: LF: DEGEN 1103...Simple RX Loop info 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 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) ------_=_NextPart_001_01C95593.61432512 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Mel and others, > I have a LM747 that might do the trick, use one half. 73 mal/g3kev > Use a LM741 Op-Amp in place of the OP27.=20 Unggg. (Worried sounds!) I think you want to use it at about 0.5MHz. According to the data sheets I f= ound, the 747 has a gain-bandwidth product of 1.5MHz, so at 0.5MHz it will h= ave a gain of 3 (or thereabouts - the GBPs won't be too exact). The 741 seem= s to have a GBP of 1MHz, so at 0.5MHz it will have a gain of 2ish. For your circuit to work well, you need the op-amp gain to be well above the= gain of the amplifier (or whatever) you are building with it. I didn't look= at the circuit diagram someone kindly pointed us to, but if (at a guess) it= aims for a gain of 10 then you need an op-amp with a gain of many times tha= t - say 100 to be on the safe side. At 0.5MHz this suggests a GBP of some te= ns of MHz. Mel - I think I have a couple of AD844 chips lying unwanted at work. If I re= call aright, they have a GBP of 60MHz. Would you like a couple? I could easi= ly drop them in the post if you want, if you send me a snail-mail address. (= 'Fraid I don't have an up-to-date callbook.) If you don't want to put your p= ostal address on the newslist, my email is c.trayner@leeds.ac.uk . 73, Chris G4OKW ----------------------------- Dr Chris Trayner School of Electronic & Electrical Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom Tel: +44 113 34 32053 Fax: +44 113 34 32032 ------_=_NextPart_001_01C95593.61432512 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: base64 eJ8+IhgWAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEIgAcAGAAAAElQTS5N aWNyb3NvZnQgTWFpbC5Ob3RlADEIAQ2ABAACAAAAAgACAAEEgAEAKgAAAFJFOiBMRjogIERF R0VOIDExMDMuLi5TaW1wbGUgUlggTG9vcCBpbmZvAIkLAQWAAwAOAAAA2AcMAAMAFgAGABcA AwAkAQEggAMADgAAANgHDAADABYABgAXAAMAJAEBCYABACEAAAAwQjgyRkRBMTMwOEVCMzQ2 OTI4OURCMTg2ODRGNTc0NAAeBwEDkAYA8AwAADkAAAADACYAAAAAAAMANgAAAAAAQAA5ABIl Q2GTVckBHgA9AAEAAAAFAAAAUkU6IAAAAAACAUcAAQAAADkAAABjPXVzO2E9IDtwPVVuaXZl cnNpdHkgb2YgTGU7bD1IRVJNRVM0LTA4MTIwMzIyMDYyM1otMTk3OQAAAAAeAEkAAQAAACoA 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