Return-Path: Received: (qmail 19238 invoked from network); 7 Dec 2000 14:41:29 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 7 Dec 2000 14:41:29 -0000 Received: (qmail 21587 invoked from network); 7 Dec 2000 14:43:34 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 7 Dec 2000 14:43:34 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 1442A3-0002QH-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 07 Dec 2000 14:36:39 +0000 Received: from smtp-out2.bellatlantic.net ([199.45.39.157]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14429v-0002Q7-00 for rsgb_lf_group@blacksheep.org; Thu, 07 Dec 2000 14:36:32 +0000 Received: from bellatlantic.net (client-151-200-111-23.bellatlantic.net [151.200.111.23]) by smtp-out2.bellatlantic.net (8.9.1/8.9.1) with ESMTP id JAA02819; Thu, 7 Dec 2000 09:36:14 -0500 (EST) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3A2F9FFC.753FBB05@bellatlantic.net> Date: Thu, 07 Dec 2000 09:34:37 -0500 From: "Andre' Kesteloot" X-Mailer: Mozilla 4.7 [en]C-CCK-MCD NSCPCD47 (WinNT; I) X-Accept-Language: en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Looking for 2-3 Watt Linear PA for LF References: <2000120614015968199@zetnet.co.uk> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: The LM1875 IC does that without any problem. Maplin even has (had ?) a kit of parts 73 Andre' N4ICK ******************************** Peter Dodd wrote: > 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 > >