Return-Path: X-Spam-DCC: paranoid 1102; 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=-2.1 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,HTML_50_60,HTML_MESSAGE 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 tB9AmSC3003086 for ; Wed, 9 Dec 2015 11:48:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6c9V-0002uA-C0 for rs_out_1@blacksheep.org; Wed, 09 Dec 2015 10:39:17 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6c9U-0002u1-QL for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2015 10:39:16 +0000 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a6c8R-0004wk-5h for rsgb_lf_group@blacksheep.org; Wed, 09 Dec 2015 10:39:15 +0000 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Wed, 9 Dec 2015 11:36:58 +0100 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%13]) with mapi id 14.03.0123.003; Wed, 9 Dec 2015 11:37:35 +0100 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: TDA7498 2x100W audio PA for LF use ?? Thread-Index: AdExnJfAmzKmCh87SMSzlStNcvo2HQAA4ZYAADNNtnA= Date: Wed, 9 Dec 2015 10:37:34 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB1B2C8409@servigilant.vigilant.local> In-Reply-To: <5666B9BA.3050707@lineone.net> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 1273381c241b4bc851b7e848e0897dc9 Subject: RE: LF: TDA7498 2x100W audio PA for LF use ?? Content-Type: multipart/alternative; boundary="_000_579355A36AEE9D4FA555C45D556003AB1B2C8409servigilantvigi_" 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 Status: O X-Status: X-Keywords: X-UID: 5682 --_000_579355A36AEE9D4FA555C45D556003AB1B2C8409servigilantvigi_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Hugh Were did you got the kit ? Is it still available ? 73 de Luis EA5DOM ________________________________ De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blackshe= ep.org] En nombre de LineOne Enviado el: martes, 08 de diciembre de 2015 12:07 Para: rsgb_lf_group@blacksheep.org Asunto: Re: LF: TDA7498 2x100W audio PA for LF use ?? I bought a 300W amplifier kit, all the small transistors have an "ft" in th= e VHF region and the power transistors ft is 15MHz. Small modifications inc= lude changing the Zobel network and bypassing some electrolytics with 100nF= . Latterly I have fitted 250V power transistors to replace the 150V, some s= pikes were liable to "kill" the originals. It gives me 300W dc input, about half available as RF power. Forced cooling= is necessary. On 08/12/2015 09:41, VIGILANT Luis Fern=E1ndez wrote: Hi LF I have read about using old TDA2010 audio modules as exciter stages for LF = amplifiers Searching the web have found that there is actually a bunch of cheap audio = amplifiers based in TDA7498 which is 2x100W. I wonder if this worths to get some watts into = LF. Mat be the two outputs can be also combined if feeded ati phase ? Have a look at one of this here http://www.ebay.com/itm/New-TDA7498-100W-100W-Class-D-Amplifier-Board-Compu= ter-Amplifier-/310956174740?hash=3Ditem48666ead94:g:WXcAAOxyYANTcIW4 73 de Luis EA5DOM --_000_579355A36AEE9D4FA555C45D556003AB1B2C8409servigilantvigi_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Hugh
 
Were did you got the kit ? Is it = still available ?
 
73 de Luis
EA5DOM

De: owner-rsgb_lf_group@blacksheep.= org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de LineOne
Enviado el: martes, 08 de diciembre de 2015 12:07
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: TDA7498 2x100W audio PA for LF use ??

I bought a 300W amplifier kit, all the small transistors have an "ft&q= uot; in the VHF region and the power transistors ft is 15MHz. Small modific= ations include changing the Zobel network and bypassing some electrolytics = with 100nF. Latterly I have fitted 250V power transistors to replace the 150V, some spikes were liable to "kill&quo= t; the originals.
It gives me 300W dc input, about half available as RF power. Forced cooling= is necessary.


On 08/12/2015 09:41, VIGILANT Luis Fern=E1nd= ez wrote:
Hi LF

I have read about using old TDA2010 audio modules as exciter stages fo= r LF amplifiers

Searching the web have found that there is actually a bunch of cheap a= udio amplifiers based
in TDA7498 which is 2x100W. I wonder if this worths to get some watts = into LF. Mat be the
two outputs can be also combined if feeded ati phase ?

Have a look at one of this here

73 de Luis
EA5DOM

--_000_579355A36AEE9D4FA555C45D556003AB1B2C8409servigilantvigi_--