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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id d71sm42810904wma.7.2018.01.01.02.38.58 (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 01 Jan 2018 02:38:59 -0800 (PST) Date: Mon, 1 Jan 2018 10:38:58 +0000 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <1245872871.20180101103858@gmail.com> To: rsgb_lf_group@blacksheep.org CC: dead.fets@gmail.com MIME-Version: 1.0 X-Spam-Score: 0.0 (/) 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: Hello LF'ers, and a happy and healthy New Year to you all. I use my U3S QRP Labs exciter to drive a PA on 137kHz, and it works fine. Hans, the designer, made changes allowing a 180 degree out of phase pair of signals to come from the Si5351A synthesizer chip with the intention of this being able to drive a push pull Class D FET driver chip directly without a X2 signal being divided and split by a preceding IC, please see original and simplified circuits below. I tried this but it appears the circa 2.2V outputs of the Si5351A chip are not sufficient to drive the inputs of the IR2110 FET driver. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 49f0f587e44d6711c57b8a4e950ba850 Subject: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME 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 Hello LF'ers, and a happy and healthy New Year to you all. I use my U3S QRP Labs exciter to drive a PA on 137kHz, and it works fine. Hans, the designer, made changes allowing a 180 degree out of phase pair of signals to come from the Si5351A synthesizer chip with the intention of this being able to drive a push pull Class D FET driver chip directly without a X2 signal being divided and split by a preceding IC, please see original and simplified circuits below. I tried this but it appears the circa 2.2V outputs of the Si5351A chip are not sufficient to drive the inputs of the IR2110 FET driver. Any ideas please? Thanks. Original PA circuit (works fine with "normal" U3S driving the 74F74 direct with CLK0 output): http://www.gatesgarth.com/amp.jpg Modded amp circuit (simplified in the hope of building with one less IC): http://www.gatesgarth.com/amp-modded.jpg IR2110FET driver specs: http://www.gatesgarth.com/IR2110.pdf 74F74 IC specs: http://www.gatesgarth.com/74F74.pdf U3S schematic: http://www.gatesgarth.com/u3s-schematic.jpg -- Best regards, Chris mailto:dead.fets@gmail.com