Paranormal update ~ http://globalfreeenergy.info/2010/09/02/paranormal-update/
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  Loading ... |  Click here to read | Spark of Divinity ~ http://highertruth.info/2010/09/02/spark-of-divinity/ @WhereIsPaulJr http://twitpic.com/2hh5ym – Congratulations on your wedding!! Such a cute couple! Some great news: Today I was able to get some *bonded* NdFeB magnets. The bad news: According my quick measurements, the bonded NdFeB magnets I was able to obtain have an electrical resistivity of only 5.5 times higher than sintered NdFeB magnets. When time permits, I’ll make TOR (Tiny Orbiter Rig, formally “Tiny Orbo Replication”) version 5 using these bonded NdFeB magnets, but I’m not expecting much, but you never know until you try it. It will be worth the try. The efficiency meter circuit is finally built, and appears to be working. I liked a YouTube video — Tibet: Murder in the Snow (Part 6/6) http://youtu.be/memA6qKa_wM?a I liked a YouTube video — Tibet: Murder in the Snow (part 5/6) http://youtu.be/vq6oJTobhsg?a I liked a YouTube video — Tibet: Murder in the Snow (Part 4/6) http://youtu.be/tYVlRgmykG4?a I liked a YouTube video — Tibet: Murder in the Snow (Part 3/6) http://youtu.be/Xv7Z6sDVEbg?a I liked a YouTube video — Tibet: Murder in the Snow (Part 2/6) http://youtu.be/fcJxSWSn4RA?a I liked a YouTube video — Torture_In_Tibet.avi http://youtu.be/zw6Eq64kZEU?a I liked a YouTube video — Tibet: Murder in the Snow (Part 1/6) http://youtu.be/r8GYKkntC6U?a More changes! Well, if I worked for a company, like Steorn, I would hope on Digikey and spent the $7 S&H to buy one meager $1 part, but I can’t afford that luxury. The linear optoisolator will just have to be added to my private wish list to be purchased when the total parts list exceeds $30. After some thought I came up with a great idea to do away with the differential probe for now due to lack of a linear optoisolator. Well, of course I could always use an instrumentation op-amp where it’s ground is part of the common ground. That would eliminate the need for an optoisolator, but then again the instrumentation op-amp’s common voltage must not exceed Vcc, which is 15 volts *MAX*. Hey, that’s not going to work for the Hue because it can go over 60 volts. Another idea is to use a voltage divider. That will work, but I came up with an even better idea. Just use a differential *current* probe! Now we’re cookin! … knock on wood!
Just out of curiosity, last night I was about to measure the power required to rotate the TOR (Tiny Orbiter Rig, formally “Tiny Orbo Replication”) v4 at the specified 17,100 rpm. I’m think it’s somewhere between 2 to 10 watts. So I had the TOR v4 connected to a dremel drill ready to go. Then plugged the dremel drill into a power meter that’s built into a battery backup power supply. It’s too bad because this power meter was obviously meant for high power devices like computers. The power display shows units down to 1 watt; e.g., 0.000 KW. Unfortunately it jumps from 0 to 30 watts, and it’s impossible to get anything between. The next jump is 36 watts, and continues in 6 watt increments. What a shame! The concept was to measure the dremel drill power input @ 17,100 rpm with and then without the TOR v4. It’s not the most accurate method, but it would be close enough.
Has anyone seen this Steorn video? Very interesting. The above photo is a snapshot from the video. I’ve seen photos of this machine, but not while it was running. Don’t laugh, but this video is new to me. http://www.youtube.com/watch?v=wD6gT3QIlpY
All of the dirty details are worked out. The old design worked, but it had to operate within a relatively narrow temperature range, and required ultra high precision resistors. It just didn’t sit well with me at all. In the new design, there will be three normal op-amp channels. Normal, in that all three have a common ground. Then there’s a fourth channel that will be a true differential input. It will be like a true differential probe. It will have it’s own battery and it’s own ground. The last remaining work is to figure out which method I’m going to use to link the differential circuit to the MCU input. Perhaps a voltage to current op-amp converter circuit that feeds an optoisolator? Most of today was spent on getting my car brakes done. A neighbor who owns a car dealer gave me an offer I couldn’t refuse. Part of today was spent on fiddling with the op-amp circuits for the Hue MCU efficiency meter. It only requires a POT to balance the differential op-amp circuit that will measure the current, but I just dont’ like. Call me stuborn, or what. Also, something else, something good, is happening, but I won’t menti0n it until it’s successful.
Most of yesterday was spent with a relative who visited from the Valley. Also spent a good amount of yesterday and today looking for bonded and uncoated sintered NdFeB magnets. The Hue MCU efficiency meter is coming along. I’ll try to spend more time on it now. It’s mostly debugging the op-amp circuit that has four inputs that are connected to the Hue device. Nothing terribly unexpected. Just a few issues with input resistance and ground since all four op-amps share the same the ground. It would be a lot easier if they had their own separate ground, like 4 different DVM’s. LTspice is doing a great job correctly simulating the circuit. The last sim shows the design tweaks should work. It’s basically just a matter of using resistors with more resistance. After the op-amps are all working with the Hue device, the MCU software needs a few changes, and that should be it. | ||||
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The thing about bonded NdFeB magnets is that the amount of bonding agent used in the mixture varies from manufacturer. If they use more bonding agent, then the magnet will have higher electrical resistivity.
What a disappointment! Sure, that will decrease the eddy currents, but man are these magnets weak. The magnetic field strength is about half of sintered NdFeB’s, which means the pulling force is one fourth.
This thing has more reincarnations that the Dalai Lama. A good part of yesterday was spent on rigorously testing all of my optoisolators trying to make at least one linear from 0 to say 10 mA. The best one was linear from 3 to 10 mA. So I don’t have any linear optoisolators. They’re all the kind made to be a BJT switch.
