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 w01LhcC7024753 for ; Mon, 1 Jan 2018 22:43:41 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eW7nT-00053H-4l for rs_out_1@blacksheep.org; Mon, 01 Jan 2018 21:39:03 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eW7nS-000538-R5 for rsgb_lf_group@blacksheep.org; Mon, 01 Jan 2018 21:39:02 +0000 Received: from omr-a007e.mx.aol.com ([204.29.186.58]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1eW7nP-0000Xq-2C for rsgb_lf_group@blacksheep.org; Mon, 01 Jan 2018 21:39:01 +0000 Received: from mtaomg-mce02.mx.aol.com (mtaomg-mce02.mx.aol.com [172.29.27.208]) by omr-a007e.mx.aol.com (Outbound Mail Relay) with ESMTP id 02FF6380008D for ; Mon, 1 Jan 2018 16:38:57 -0500 (EST) Received: from core-acx10e.mail.aol.com (core-acx10.mail.aol.com [172.27.155.135]) by mtaomg-mce02.mx.aol.com (OMAG/Core Interface) with ESMTP id B201E38000081 for ; Mon, 1 Jan 2018 16:38:56 -0500 (EST) Received: from 188.194.222.230 by webjas-vad221.srv.aolmail.net (10.96.35.224) with HTTP (WebMailUI); Mon, 01 Jan 2018 16:38:56 -0500 Date: Mon, 1 Jan 2018 16:38:56 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <160b3a9c7d1-171c-1d653@webjas-vad221.srv.aolmail.net> In-Reply-To: <781825051.20180101212433@gmail.com> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1514842736; bh=ZkbxGc/3wu/IoqxeY4enuqut6NXStnj0hIQrF7Fx5G8=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=naKLTxPv1q9DuZAex0cM1VyHWZ4h91w2ANiOR8mggBb/lHSPlYMLcvvxGZQ3mWP0L yGrxJpVMDbhY7a3xTUTbgvUk7UutCBD5B4lrVYMRmh9nQa88Cw0TQBWwMhhdaVGMAk l/Vg5BRHHz47jDF6qOikwJ/NbfXXmbsrZlf2GgDg= x-aol-sid: 3039ac1d1bd05a4aaa70433d X-Spam-Score: 1.0 (+) 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 the administrator of that system for details. Content preview: > Any ideas please? As Andy said, bias half way: place another pair of 15k from the inputs (Pins 12,10) to 5V (pin9). 73, Markus [...] Content analysis details: (1.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 1.0 FREEMAIL_REPLY From and body contain different freemails X-Scan-Signature: 2ee80849a5d572dbc974bb207a527753 Subject: Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? Content-Type: multipart/alternative; boundary="----=_Part_152402_1635601803.1514842736593" 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 ------=_Part_152402_1635601803.1514842736593 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable > Any ideas please? As Andy said, bias half way: place another pair of 15k from the inputs (Pin= s 12,10) to 5V (pin9). 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Chris Wilson An: rsgb_lf_group Verschickt: Mo, 1. Jan 2018 22:26 Betreff: Re: LF: Si5351A syntehsiser able to fire a FET driver chip directl= y?? Hello Andy, MCP1404 IC fitted, as soon as power to the PA FETS is applied (even 6V) one of the gate square waves either disappears or becomes extremely random. Swapping inputs to the driver IC makes no difference, it's one pair of PA FET's dependent. FET's work fine when returned to "as designed" status! Driving the driver IC through the 1nF caps and 15k resistors to ground. Outputs from CLK0 and CLK1 are 180 out of phase and seem correct. Any ideas please? Thank you! http://www.gatesgarth.com/amp-modded.jpg Monday, January 1, 2018, 11:27:20 AM, you wrote: > Seems an odd choice of driver chip. A high/low side driver used in > a non-bootstrapped mode to drive two low-side FETs=20 > How about one of the normal FET driver chips - picking out one I've > used in the past, the MCP14E 3/4/5 family. Logic level input, > spec. Logic '0' max 1.3V, Logic '1' min 2.4V. So bias half way and > your 2.2V swing takes it into the valid range. > They three types are inverting, non inverting, and one of each in a packa= ge > Andy G4JNT --=20 Best regards, Chris mailto:dead.fets@gmail.com ------=_Part_152402_1635601803.1514842736593 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
> Any ideas please?

As= Andy said, bias half way: place another pair of 15k from the inputs (Pins = 12,10) to 5V (pin9).

73, Markus

-----= Urspr=C3=BCngliche Mitteilung-----
Von: Chris Wilson <de= ad.fets@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@bl= acksheep.org>
Verschickt: Mo, 1. Jan 2018 22:26
Betreff: Re: LF: Si5351A syntehsiser able to fire a FET driver chip d= irectly??



Hello Andy,

MCP1404 IC fitted, as soon a= s power to the PA FETS is applied (even
6V) one of the gate = square waves either disappears or becomes
extremely random. = Swapping inputs to the driver IC makes no
difference, it's o= ne pair of PA FET's dependent. FET's work fine when
returned= to "as designed" status! Driving the driver IC through the
= 1nF caps and 15k resistors to ground. Outputs from CLK0 and CLK1 are
180 out of phase and seem correct. Any ideas please? Thank you!
http://www.gatesgarth.com/amp-modded.j= pg

Monday, January 1, 2018, 11:27:20 AM,= you wrote:



= > Seems an odd choice of driver chip.  A high/low side driver used = in
> a non-bootstrapped mode to drive two low-side FETs&n= bsp;


> How about one of t= he normal FET driver chips - picking out one I've
> used = in the past, the MCP14E 3/4/5 family.   Logic level input,
> spec. Logic '0' max 1.3V, Logic '1' min 2.4V.   So = bias half way and
> your 2.2V swing takes it into the val= id range.



> They three types are inverting, non inverting, and one o= f each in a package


> And= y  G4JNT





--
Best regards,
Chris mailto:dead.fets@gmail.com


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