http://tech.groups.yahoo.com/group/randrdesulfatorforum/ Rick & Richard's Desulfator Forum Sun, 08 Nov 2009 15:17:21 GMT Chuck Carpenter http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1109 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1109 Based on Bill's Improved PFET Couper desulfator, I put together an NFET version. To me, it looks pretty good. I've posted a couple of PDF pages in the Files Sun, 01 Nov 2009 20:20:41 GMT scriabini http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1108 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1108 Only when the flyback pulse exceeds the rating of the N-MosFet and takes it into repetitive avalanche. An overvoltage absorber across the MosFet will solve Sun, 01 Nov 2009 13:00:30 GMT Bill http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1107 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1107 Send me your schematic and I will take a look at it. Bill Sun, 01 Nov 2009 11:46:50 GMT Chuck Carpenter http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1105 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1105 I haven't tried the peak detector yet. The limitation might be that you wouldn't "see" any negative component in the pulse waveform. Maybe you don't need to. Sun, 01 Nov 2009 11:15:39 GMT Chuck Carpenter http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1104 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1104 Bill, I blew a couple IRFZ44s but it was because I was driving them at a pulse/reprate that was way too high. Bad connection in the 555 circuit so the timing Sun, 01 Nov 2009 07:13:07 GMT linesrg48 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1103 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1103 Bill, I've no direct experience with a Nfet Couper but I am having problems getting a low voltage cut off to work with th Pfet version. My EE colleague reckons Sun, 01 Nov 2009 05:09:55 GMT Bill http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1102 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1102 Has anyone had problems with blown FETs with a Couper circuit modified to use a Low Side NFET switch? Sat, 31 Oct 2009 20:29:17 GMT scriabini http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1101 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1101 The 'Bedini devices' and the 'Couper Desulfator' circuit both rely upon inductive flyback. As a matter of fact there is really very little difference. It is Sat, 31 Oct 2009 15:58:24 GMT Anwar Shiekh http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1100 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1100 I agree totally, and that is why I made the post that precedes this one. I thought I had repeatedly (too repeatedly) demonstrated that you are not predicting a Sat, 31 Oct 2009 15:53:49 GMT Bill http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1099 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1099 Then what is your real point and purpose ? To quibble about the meaning of "predicitve" ? To show my simple and rudimentary ( as I have clearly stated) Sat, 31 Oct 2009 15:53:40 GMT Anwar Shiekh http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1098 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1098 I have to admit that it is becoming quite clear that I am just wasting everybody's time, in becoming way to repetitive. Redundancy is one thing, but my posts Sat, 31 Oct 2009 15:45:11 GMT Anwar Shiekh http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1097 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1097 I was hoping you could just tell me. Sat, 31 Oct 2009 15:40:18 GMT Anwar Shiekh http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1096 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1096 My fault, perhaps I was not clear I am not referring to purchased components, but those used to model the battery, and so are unknown (battery inductance, Sat, 31 Oct 2009 15:36:06 GMT Bill http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1095 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1095 Please find my statement where I said the below and post it in quotes. Sat, 31 Oct 2009 15:32:29 GMT Chuck Carpenter http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1094 http://tech.groups.yahoo.com/group/randrdesulfatorforum/message/1094 As Bill points out quite specifically, SPICE models are just that, models. The components used are the same as those anyone would buy off the shelf from