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  • I've been absent from the group for some months now, a surprise separation and upcoming divorce being the main reason. But earlier this month I was accepted into a Master of Engineering program at the University of South Australia where I'm doing -- wait for it -- Autonomous Systems. Yup. Robots. I got my bachelor degree in Robotics Engineering back in 1987, and the stuff I'm...
    rlnansel@... Mar 29
  • I've been reading through some of the stuff Duane Johnson of Red Rock Energy has posted on his site, in particular his BEAM circuits and his various solar tracking circuits . In it he makes the point that, at least for outdoor PV systems in summer, that aiming a panel square to the sun to get more power is more cost effective than using an MPPT system to optimise the electrical...
    rlnansel@... Oct 21, 2014
  • Still working on this circuit. I've added catch diodes to the MOSFETs because I'm not sure the reverse recovery time of the MOSFET intrinsic diodes is fast enough. I'll take them back out if this proves not to be an issue. The motor is singing a veritable aria now that I've removed the clumsey capacitor network across the motor in the original circuit. I'm replacing it with a true...
    rlnansel@... Oct 18, 2014
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  • I've managed to "improve" the circuit a little by adding an active pulldown to the gate-boost drive; since the 54VN30 is an open drain output, I had to add an active pullup (Q5) in order to make the gate-boost drive work, but I'd thought the 47K pulldown (R4) would have been sufficient. I don't quite know why, but it seems to work better with the PNP pulldown. Another issue seems...
    rlnansel@... Oct 12, 2014
  • Whoops! Scratch that last post; I was writing about the SE LED tracker circuit I'm working on, not the T3SE. It may well have a voltage wobble, too, but I have not looked at it with my 'scope, yet. Too many circuits, but not enough functioning neurons this Australian morning. Or maybe I just need more caffeine. Caffeine should be right up there with duct tape and WD40. Being...
    rlnansel@... Oct 12, 2014
  • Thanks, anyway, Martin. I'm poring over the scope traces (not a DSO, alas), so I'm beginning to get a feel for what might be going wrong. I do notice that when it hangs the current goes up substantially. Even for normal cycles, there's this weird 0.2V "wobble" at about 2.5V that lasts about a second. I'm tempted to break out my old chart recorder to see if I can get it working (I'm...
    rlnansel@... Oct 12, 2014
  • OK, it's been more than two weeks since I asked, so maybe my message was too long/dull/detailed, but I could still really use some help taming Wilf's T3SE. Has anybody else used it? Has anyone seen similar problems? Is there a different circuit to recommend? -Bobby
    rlnansel@... Oct 12, 2014
  • I'm working on an SE 1D tracking head circuit originated by Duane Johnson from redrok.com. I've changed the values a bit, namely I'm using 5mm Cree blue LEDs rather than green LEDs, and I'm also using the open-drain version of the TC54, but it seems to work. Except when it doesn't. It seems to lock up sometimes. The voltage on the storage capacitor sometimes rises to about 1.5V...
    rlnansel@... Oct 11, 2014
  • After a little googling I came across this paper on using memristors in "AHaH" , which stands for Anti-Hebbian and Hebbian plasticity, or learning. What stuck out in a very casual skim of the paper was their diagram for a memristor model of a synapse. Enjoy! -Bobby
    rlnansel@... Oct 5, 2014
  • So, Richard, have you made any progress with memristers in the last three months? I've just reread the whole thread, and it's quite fascinating. -Bobby
    rlnansel@... Oct 5, 2014