Return-Path: Received: (qmail 74718 invoked from network); 21 Jan 2004 20:05:31 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 21 Jan 2004 20:05:31 -0000 Received: (qmail 81435 invoked from network); 21 Jan 2004 20:05:31 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 21 Jan 2004 20:05:30 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1AjObR-000L3H-W4 for dave@picks.force9.co.uk; Wed, 21 Jan 2004 20:05:30 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AjOaq-00063L-Bv for rs_out@blacksheep.org; Wed, 21 Jan 2004 20:04:52 +0000 Received: from [62.58.50.89] (helo=postbode02.zonnet.nl) by post.thorcom.com with esmtp (Exim 4.14) id 1AjOap-000638-Go for rsgb_lf_group@blacksheep.org; Wed, 21 Jan 2004 20:04:51 +0000 Received: (qmail 1310 invoked by uid 10); 21 Jan 2004 20:04:19 -0000 Received: (vexira-qq 01062-ED785CF7 invoked from network) 21 Jan 2004 21:04:14 +0100 X-Fake-Domain: unknown Received: from unknown (HELO ibm) ([62.59.190.157]) (envelope-sender ) by postbode02.zonnet.nl (qmail-ldap-1.03) with SMTP for < >; 21 Jan 2004 20:04:13 -0000 X-Bad-Message-ID: no DNS (ibm) Message-ID: <001501c3e058$ba617980$2102000a@ibm> From: "Dick" To: rsgb_lf_group@blacksheep.org References: <000c01c3e02e$600a21a0$01eafc3e@l8p8y6> Date: Wed, 21 Jan 2004 20:35:29 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Antivirus: checked by Vexira MailArmor (version: 2.0.1.16; VAE: 6.23.0.2; VDF: 6.23.0.29; host: postbode02.zonnet.nl) Subject: LF: TDA2030 amplifier by OM2TW Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.7 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_30_40,HTML_MESSAGE autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 2 Content-transfer-encoding: 8bit

Hello all,

As I haven't OM2TW's emailadress right now, I'll ask here.

I found an pdf.drawing of the TDA2030 amplifier giving 5Watts or so on 136kHz.

however, at hte output stage there are two coils L3/L4 (ouput transformer) with no

further details mentioned.

Can anyone help me with detailed info about the value/or how to construct these coils?

Also some uncertainty about C21 and C22, are they elco's or normal C's????

73 Dick, pa4vhf

(now probably first try to create QRP in an easy way.......)