Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w87KJMEJ026347 for ; Fri, 7 Sep 2018 22:19:23 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1fyN9x-0000LU-QI for rs_out_1@blacksheep.org; Fri, 07 Sep 2018 21:15:17 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1fyN9v-0000LL-J0 for rsgb_lf_group@blacksheep.org; Fri, 07 Sep 2018 21:15:15 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1fyN9t-00028d-R7 for rsgb_lf_group@blacksheep.org; Fri, 07 Sep 2018 21:15:14 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id D24392107D for ; Fri, 7 Sep 2018 22:15:12 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1536351312; bh=bVWxXA/D1G8yngKg6/ek+2Lv+07M/dhtWtkhYU9TDiA=; h=Date:From:To:Subject:From; b=XYRP4LAeX0lA3iVv7qIzCnmycDpiSETJH+NXEaAEuYLW1XGgQOdRa97D3nD3WXrkA /IKFmjY4cJ6RvkUpngfAqJyQbtwtgbdTXnpqoaTnUARM2A93JJl6dwm1FQqdjkZHZD Drrb6inDUiYhFpe6seEj/o6rpwpJ0j+StwDxB8Y7A26PEjcHdIiUwDtlYK5N934Ftm kq6E2fFJpLZwOQjxhiquBvemyTjcGcAQM5vdC3GBzgo8zGa9EDoYlO+efPw1vLg5CP lP3/86FJ9lR3/Ig+AajavzcnruAfuUwffavYti78xWLsy/quh0mESV+0pxF24G2f6d jWAd1fgMqbReA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 426TFX1QMLz6tm5 for ; Fri, 7 Sep 2018 22:15:12 +0200 (CEST) Message-ID: <5B92DC4F.6000202@posteo.de> Date: Fri, 07 Sep 2018 22:15:11 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <7146FF45F4F44338A98C3ADB1769F8D4@mal> In-Reply-To: <7146FF45F4F44338A98C3ADB1769F8D4@mal> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Hi Mal, The Schmitt-trigger could deform the duty-cycle of the the signal, which can be very critical for some kind of PAs :-) I often use a simple OP AMP and amplify the signal so that the OP AMP is clipping. Not the perfect way maybe but it worked just last weekend where i drove the H bridge that way from a low audio signal coming from the PC. [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 0317e2ac8ed27149e57223a21580246d Subject: Re: LF: Sine wave/Sq wave Content-Type: multipart/alternative; boundary="------------040401080102010408000905" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE autolearn=no version=2.63 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 This is a multi-part message in MIME format. --------------040401080102010408000905 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Mal, The Schmitt-trigger could deform the duty-cycle of the the signal, which can be very critical for some kind of PAs :-) I often use a simple OP AMP and amplify the signal so that the OP AMP is clipping. Not the perfect way maybe but it worked just last weekend where i drove the H bridge that way from a low audio signal coming from the PC. 73, Stefan Am 07.09.2018 16:20, schrieb g3kevmal@talktalk.net: > LF/MF > Someone was asking about converting sine wave to Sq wave recently from > a TS590 to drive an Amplifier > Feed the DRV output sine wave from the TS590 to a Schmitt triger cct > and then use a Direct Amplifier similar to the Decca 5501 class D > bridge amp. > I use this method on LF es MF and never had a problem. > 73 gl de mal/g3kev --------------040401080102010408000905 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Mal,

The Schmitt-trigger could deform the duty-cycle of the the signal, which can be very critical for some kind of PAs :-) I often use a simple OP AMP and amplify the signal so that the OP AMP is clipping. Not the perfect way maybe but it worked just last weekend where i drove the H bridge that way from a low audio signal coming from the PC.

73, Stefan

Am 07.09.2018 16:20, schrieb g3kevmal@talktalk.net:
LF/MF
Someone was asking about converting sine wave to Sq wave recently from a TS590 to drive an Amplifier
Feed the DRV output sine wave  from the TS590 to a Schmitt triger cct and then use a Direct Amplifier similar to the Decca 5501 class D bridge amp.
I use this method on LF es MF and never had a problem.
 
73 gl de mal/g3kev
 
 
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