Return-Path: Received: (qmail 29700 invoked from network); 6 Dec 2000 14:14:02 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by excalibur.plus.net with SMTP; 6 Dec 2000 14:14:02 -0000 Received: (qmail 1813 invoked from network); 6 Dec 2000 14:09:05 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 6 Dec 2000 14:09:05 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 143exc-0004vl-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 06 Dec 2000 13:50:16 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from irwell.zetnet.co.uk ([194.247.47.48] ident=root) by post.thorcom.com with esmtp (Exim 3.16 #1) id 143exZ-0004vg-00 for rsgb_lf_group@blacksheep.org; Wed, 06 Dec 2000 13:50:13 +0000 Received: from central.zetnet.co.uk (central.zetnet.co.uk [194.247.47.20]) by irwell.zetnet.co.uk (8.9.3/8.9.3/Debian/GNU) with SMTP id NAA32129 for ; Wed, 6 Dec 2000 13:50:07 GMT X-ZSender: g3ldo@zetnet.co.uk Message-ID: <2000120614015968199@zetnet.co.uk> Date: Wed, 6 Dec 2000 14:01:59 GMT To: rsgb_lf_group@blacksheep.org From: "Peter Dodd" X-Mailer: ZIMACS Version 1.20c 10000836 Subject: Re: LF: Looking for 2-3 Watt Linear PA for LF Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Hi Geri > Does anyone of you have a proven scheme of a small linear PA available, > that delivers about 2 or 3 Watts from 10 mW, preferably from 18 Volts > (which is the voltage used by the exciter)? I am sure a small audio > amplifier would do ... I had a similar problem when I wanted to amplify the output of a signal generator to drive my impedance matching unit. The amplifier had to be linear to minimise harmonic content. I used a commercial car stereo amplifier from a local radio junk shop (yes we are lucky to still have one of these locally). See page 86-88 of 'The Low Frequency Experimenter's Handbook'. -- Regards, Peter, G3LDO