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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id u18sm734398edm.40.2018.04.11.04.40.17 (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 11 Apr 2018 04:40:17 -0700 (PDT) Date: Wed, 11 Apr 2018 12:40:16 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <765412878.20180411124016@gmail.com> To: N1BUG In-Reply-To: References: <1UQRRBrZ33.5N62o0UWd72@optiplex980-pc> <5a4a2419-c192-d615-4ad2-bc6bd3f576ec@n1bug.com> <1UQRS7hUUP.4XeOGcYqkSd@optiplex980-pc> 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 Paul, effectively the same as I am using, so I think you can safely discount those. Have you tried de-coupling caps yet, especially on the driver IC? I think the hump on the gate waveform is the driver overcoming the gate capacitance of the FET's. [...] 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: f38d515a9cad1e977fcfe251941a8120 Subject: Re: LF: W1VD amp help - more waveforms 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 Paul, effectively the same as I am using, so I think you can safely discount those. Have you tried de-coupling caps yet, especially on the driver IC? I think the hump on the gate waveform is the driver overcoming the gate capacitance of the FET's. Wednesday, April 11, 2018, 12:30:38 PM, you wrote: > Jay, > The caps I used are polyester. Here's the datasheet: > https://www.mouser.com/datasheet/2/212/KEM_F3101_R82-1103738.pdf > It mentions timing applications, but I am no capacitor expert! > Comments appreciated. Mine are 5% tolerance marked 1nJ100. > I always measure resistors because I don't trust my eyes. The ones > used here measured about 14.98k on my Fluke DMM. > My proto board construction technique uses 'rows' of solder which > undoubtedly results in higher than usual stray C. However I would > expect it to be a few pf, not something that would throw the circuit > off this much. > Paul -- Best regards, Chris mailto:dead.fets@gmail.com