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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <84266593.20180918144032@gmail.com> Content-Language: en-US X-Provags-ID: V03:K1:9RTsvd5LuIzRon+/I1VG00Pdo9SAlsZ6m3DZBtx2Dn33mmU2MRY k7YjXxxUGK2k15GjFoXD1Ak0zxYsV8oQXVLm9U20axBFSC5CJDgWGvx+w5G0c3z3N0NR0BB DAVPcLtuqFkW6BSUP/jyqBU2vBXMKdeMvffPvPXRAsWVzPfsdelRj+irNi7TWCJV96FqrhT pV/46laL6ZmaedwTCRRzg== X-UI-Out-Filterresults: notjunk:1;V01:K0:SkSt8pJGyYA=:cxadl5ieRLUpyEDEPxO+wg vKNSAnocBRq6MWZxJ6TCIaZb54k/qD3lPl/fRQnFV8i3dAZ+PWhWcSqrL9J4RCZo9ja1T+1uj DiUmvpBVh0Xpo179RFmqUBbP/KskOspXLQ4jUMwuNPYr1ERw34PZCA4vVO2oM91bxqDGjmRyN ei4NWkQy1KLaYctAntFjlO2lVYRNTpqCdADR+k1HCASOCjjo+5vv1iRitUVPlh2j8DmhzRNtj x7SrqFAmydDcbKjrBiJo4dAlBDig/r1+CUMrU8CLxvKsvJSJ68xSR4kIAO3HQHhVPY+RjnU/6 5yI8YoGvErS//tz103p9Ou3Gq6+Mc+QnXbg0wuX63+8CTKuKdwp9s6Ou7HmzyVT57Hlfx1Bul HRcPw0P9givh15KDp8O6Kkt2qLGjJFzoA53KdwKeneUjBGD3BqAliT4V/V3Atc3MhPIdBmz5K 1ohWOTQK8J6DnGBTj/fVM6KxvFN8+BtLB1z939B9GETLxy+M7j61x1pT6HF7SEZCeJisn+IuB wCde1w9mHrX9yZS+DACuY75xUvndaH4VC69wfEs0NERQn7wTkdZg1ht92wR1rSGgNJF1AdNUf cEgqHJrW2NvL/xn8aUajmDC30XwjCk1D6OEUsbWNSITm8dJT1foHDXpxrJvZe8z2fj1yHr+T9 wFAZ30/lOhBz0+FHISktcKLgS7Mubs3yvGHnj1wCGxKgn9QRBPEWPPEHwVxjuN9SaPvTh0vgQ fIWWOS0DGsS7/ofK 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 @@CONTACT_ADDRESS@@ for details. Content preview: Interesting. It remains to be seen how many FET deaths will occur here. Perhaps running them at 36V maximum (summer) will help them survive less than ideal operating conditions. I was a bit worried about the 34N20 no longer being available in the large package but if I am not mistaken you had been able to use 32N20 as a substitute. Presently I have no spares which is a situation deserving of attention. [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [74.208.4.197 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [74.208.4.197 listed in wl.mailspike.net] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-Scan-Signature: b77892ad90d0261eaf071f4f6cf31464 Subject: Re: LF: Re: And again! Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 Interesting. It remains to be seen how many FET deaths will occur here. Perhaps running them at 36V maximum (summer) will help them survive less than ideal operating conditions. I was a bit worried about the 34N20 no longer being available in the large package but if I am not mistaken you had been able to use 32N20 as a substitute. Presently I have no spares which is a situation deserving of attention. Paul On 09/18/2018 09:40 AM, Chris Wilson wrote: > > > Hello Paul I am not sure I did get a current clamp scope capture. If I > *DO* lose a FET it's nearly always when running OPERA with the > constant stopping and starting, or so it seems. Only lost three in > 2018 so far, so it's not too bad, compared to the old days ;) > > Tuesday, September 18, 2018, 2:28:09 PM, you wrote: > >> I'm afraid I can't help with that one. I spent some time trying to >> figure out how to implement SWR and over current protection but >> didn't come up with anything. I'll just have to use the FETs as >> sacrificial devices. > >> I am a bit puzzled by the current spike on start of transmission. >> What would cause that? > >> Paul