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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id l9sm816763edk.9.2018.04.11.06.13.59 (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 11 Apr 2018 06:14:00 -0700 (PDT) Date: Wed, 11 Apr 2018 14:13:58 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <433421254.20180411141358@gmail.com> To: N1BUG In-Reply-To: <1b2b034a-404d-8b95-220c-5568950a1918@n1bug.com> References: <1UQRRBrZ33.5N62o0UWd72@optiplex980-pc> <5a4a2419-c192-d615-4ad2-bc6bd3f576ec@n1bug.com> <1UQRS7hUUP.4XeOGcYqkSd@optiplex980-pc> <765412878.20180411124016@gmail.com> <1b2b034a-404d-8b95-220c-5568950a1918@n1bug.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 Paul, Yes, I put de-coupling caps on all of those, although some are tied together, I went for over kill! Can you temporarily jury rig the driver board right by the FET's and then try shorter gate wires? Between the two I hope you get a positive result! [...] 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: a6b6ffaf48fdddf1ed5c25dc4bf03ee1 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, Yes, I put de-coupling caps on all of those, although some are tied together, I went for over kill! Can you temporarily jury rig the driver board right by the FET's and then try shorter gate wires? Between the two I hope you get a positive result! Wednesday, April 11, 2018, 1:59:35 PM, you wrote: > Chris, > I think it was after looking at your driver board photos that I > decided to order these particular caps. They look exactly like > yours. ;-) > I haven't tried the bypass caps yet. Given we're now testing without > generating any RF (no drain voltage on the FETs) I'm a bit dubious > but I will try them. It's four caps, right? Pin 14 of the 74F74 to > ground, pins 9, 3, and 6 of the IR2210 to ground. > The other day Jay asked about power to the IR2110 and trace > thickness... which might affect drive to the FETs but probably not > the timing issue we're now chasing. However, for sake of > completeness in this thread it's a 25 amp supply!!! through 3 feet > of #18 wire to the board. The weakest link is about 3 inches of #22 > wire from the board +12V input terminal to pins 3 and 6 of the > IR2110. Anticipating a possible question... no it's not the same > supply I'm using for the FET drains, just a spare bench supply that > was conveniently located for testing. > Paul -- Best regards, Chris mailto:dead.fets@gmail.com