Return-Path: X-Spam-DCC: paranoid 1233; 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=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_50_60,HTML_MESSAGE,SPF_PASS 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 u87Gk65d016316 for ; Wed, 7 Sep 2016 18:46:06 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bhfrU-00015Z-7l for rs_out_1@blacksheep.org; Wed, 07 Sep 2016 17:38:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bhfrT-00015Q-Fl for rsgb_lf_group@blacksheep.org; Wed, 07 Sep 2016 17:38:07 +0100 Received: from mail-qk0-x22f.google.com ([2607:f8b0:400d:c09::22f]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1bhfrQ-00031d-UO for rsgb_lf_group@blacksheep.org; Wed, 07 Sep 2016 17:38:06 +0100 Received: by mail-qk0-x22f.google.com with SMTP id w204so17305817qka.0 for ; Wed, 07 Sep 2016 09:38:03 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=ocxrWDAkOTgT6Qf678Nidd7DaHw6Sj/4RHVXRMwdA6g=; b=VWMZWguLS9KZmxAOV9MG2hesMUfnJev4XcbddRl0LAY1BwgghYkc3vA9TEcwxmqJ4G PKjt1h3yeMZuQHDTte7ZU/+fQ6Wwhxzf/DXhptypx1LaggkvgnT3IaGE9NRWAiIXSYhn aFkP64ST802ngtjGQSXQgVPnQM6xoS+Z/m+v7eH3tRpNuPFSpDUryPuQrH0yz75FmmgE bnhY9wEByScbAOajzqOTOMqSlVBSbKSGwoB+coDvS6zsNoKriRkjvpvRl+wXk2g3YbH6 IIKgzefvyNWvsDfe7kdaq7lgnE2aANOYZvD5bD1fKHzUAJwNdzucHF2OJM+iFtpZBxTe JvlA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=ocxrWDAkOTgT6Qf678Nidd7DaHw6Sj/4RHVXRMwdA6g=; b=mRRpf/IZ6vCGTPIeyga5chdAICTMGEAQ8PwEIi/1LKdKU0y+m53VaAMhladd7amxE3 uYuyIuHclXLVCbsEw6VNPaZnbkbtIpXqtOpw/HG4RHVJKBjggMWUStXtulM8/u6+IS8x 93FIk3u8GZhJtn5NIKm2Iz5S0qTT4qIEOOJRyJS+fxNIAPc9jbF5uyvEQj+TUjNP+9Jt kiEvoRsmmVutC+9k2H2yuRm9W8dwMhzowcWgZ7EkCl0VX9cByWn2WRSoKvdUHM9slBmV kPpqLtpnYZUATg4KGv3dYBb9XonSwzBRHCO0dOVMMLJOe8ZvrJS8nDhxeuwenQuUu7qb vstw== X-Gm-Message-State: AE9vXwPZzhuCRz+x9unvpRWMvmmIMEnlzFvAzAkqJ22dEjeCkHdF6Gxj4AoS8ryInLP0zfEgBrbXL7hpv37wsA== X-Received: by 10.55.178.196 with SMTP id b187mr54350742qkf.121.1473266281780; Wed, 07 Sep 2016 09:38:01 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.45.194 with HTTP; Wed, 7 Sep 2016 09:38:01 -0700 (PDT) In-Reply-To: <57D0058E.4020808@posteo.de> References: <579355A36AEE9D4FA555C45D556003AB5D7D9F9C@servigilant.vigilant.local> <57D0058E.4020808@posteo.de> From: Alberto Martinez Date: Wed, 7 Sep 2016 18:38:01 +0200 Message-ID: To: rsgb_lf_group@blacksheep.org X-Scan-Signature: ee37f4b261e58bbaf6a18fc5319c092e Subject: Re: LF: EA5DOM LF tests Content-Type: multipart/alternative; boundary=94eb2c060c6e629cec053bed89fe 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8700 --94eb2c060c6e629cec053bed89fe Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi all, Congrats Luis, I see the audio PA works great. This weekend try to listen. 73! Alberto-EA4GHB 2016-09-07 14:18 GMT+02:00 DK7FC : > Hi Luis, > > Am 07.09.2016 13:33, schrieb VIGILANT Luis Fern=C3=A1ndez: > > Ideas wellcome ! :-) > > I like the W1YD design http://www.w1vd.com/137-500-500WTX.pdf > > Yes, a very typical design. > I would use a different output transformer, with a higher AL value (>=3D > 4000 nH/N^2). Then you need less primary and secondary turns. This can > become relevant when using high power at low voltages. But 50W is almost > nothing. The 240-77 is fine for several 100W. > And your FETs have a very high input capacitance. This will warm up the > 7667 at 137 kHz i think. And the rise times will rise :-) And so the > switching losses are higher..... > > For 50W at 13.8V i would use an IRFZ48N or so, something with Ciss < 2 nF= . > This will work well with the 7667 then. At 50W you can use a normal 13.8 = V > power supply. > > The unregulated power supply will quickly lead to complaints from certain > OMs as you know :-) So you need to add a regulation or very BIG caps. > > 48V is a good supply voltage for a PA. I would then tend to use IRFP260N > FETs. But then you will need a better driver, something like TC4420 or ev= en > IXDD614CI :-) > > 73, Stefan > > > Don't need the keyer and would use an ICL7667 as dual mosfet driver > For the mosfets what I have here is a couple of IRFP3206 > > I have a linear transformer with 2x24V outputs. Can be good for an > unregulated 48V supply > This is what the audio PA is using now > > 73 de Luis > EA5DOM > > ------------------------------ > *De:* owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@ > blacksheep.org ] *En nombre de *DK7FC > *Enviado el:* mi=C3=A9rcoles, 07 de septiembre de 2016 12:58 > *Para:* rsgb_lf_group@blacksheep.org > *Asunto:* Re: LF: EA5DOM LF tests > > > Am 07.09.2016 12:16, schrieb VIGILANT Luis Fern=C3=A1ndez: > > > Time for a D class PA ;-) > Output filter and transformer core is already here, so should be easy to > get some 50w or more (10dB) > > > That sounds good. Can you show a schematic that you want to build up? > Which voltage, which FETs, which driver? > > 73, Stefan > > --94eb2c060c6e629cec053bed89fe Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi all,

Congrats Luis, I see the audio = PA works great. This weekend try to listen.
73!
Alberto= -EA4GHB

2016-09-07 14:18 GMT+02:00 DK7FC <selberdenken@posteo.de>:
=20
Hi Luis,

Am 07.09.2016 13:33, schrieb VIGILANT Luis Fern=C3=A1ndez:
=20 =20
Ideas wellcome ! :-)
=C2=A0
 Yes, a very typical design.
I would use a different output transformer, with a higher AL value (>=3D 4000 nH/N^2). Then you need less primary and secondary turns. This can become relevant when using high power at low voltages. But 50W is almost nothing. The 240-77 is fine for several 100W.
And your FETs have a very high input capacitance. This will warm up the 7667 at 137 kHz i think. And the rise times will rise :-) And so the switching losses are higher.....

For 50W at 13.8V i would use an IRFZ48N or so, something with Ciss < 2 nF. This will work well with the 7667 then. At 50W you can use a normal 13.8 V power supply.

The unregulated power supply will quickly lead to complaints from certain OMs as you know :-) So you need to add a regulation or very BIG caps.

48V is a good supply voltage for a PA. I would then tend to use IRFP260N FETs. But then you will need a better driver, something like TC4420 or even IXDD614CI :-)

73, Stefan
=C2=A0
Don't need the keyer and would use an ICL7667 as dual mosfet driver
For the mosfets what I have here=C2=A0is a couple of=C2=A0IRFP3206
=C2=A0
I have a linear transformer with 2x24V outputs. Can be good for an unregulated 48V supply
This is what the audio PA is using now=C2=A0
=C2=A0
73 de Luis
EA5DOM

De: own= er-rsgb_lf_group@blacksheep.org [ma= ilto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC
Enviado el: mi=C3=A9rcoles, 07 de septiembre de 2016 12:58
Para: rsgb_lf_group@blacksheep.org
Asunto: Re: LF: EA5DOM LF tests


Am 07.09.2016 12:16, schrieb VIGILANT Luis Fern=C3=A1ndez:
=20
=C2=A0
Time for a= D class PA=C2=A0 ;-)
Output fil= ter and transformer=C2=A0core is=C2=A0already here, so should be easy to get some 50w or more (10dB)

That sounds good. Can you show a schematic that you want to build up? Which voltage, which FETs, which driver?

73, Stefan

--94eb2c060c6e629cec053bed89fe--