Recent content by otto9K9otto

Being autistic and ADD, I grew to resent the requirement to warm a seat in (engineering) college lecture classes. Maybe this short-term cognition blog post will help: http://amateur-attempt-at-preventive-health.blogspot.com/2013/12/short-term-cognition.html

Being autistic and ADD, I learned better at home than in class. I grew to resent the requirement to warm a seat in (engineering) college lecture classes. Maybe this short-term cognition blog post will help: http://amateur-attempt-at-preventive-health.blogspot.com/2013/12/short-term-cognition.html

Another problem with math self-studying is that the student does not see the big picture that a teacher should. So the student may skip over proofs (why do I need this stuff, anyway!) and just learn to solve problems. This is OK to a point. You miss some intellectual maturation by skipping proofs.

I have found the book Math on Call to be a great, inexpensive reference for helping with high school math homework.

Please specify why you need limited range: security or interference or ? The respective solutions are vastly different.

An experienced engineer I worked with was surprised that the adhesive on copper tape was conductive. He had been folding it under to ensure contact.

Part of the purpose of patents is to disseminate technology. Here is a link to mine: http://www.freepatentsonline.com/5495143.html. An associate in another part of the company had developed a process of making really sharp points of tantalum disilicide by etching rods of this material...

A separate ignitor circuit might work, but it would most likely involve an inductor, and would decrease efficiency. This at least partially defeats your original proposition. Patent 5495143 was my idea when I worked for Science Applications, so I know a bit about gas discharge tubes.

Partially evacutated gas-filled tubes (fluorescent lamps) have a highhttp://en.wikipedia.org/wiki/Breakdown_voltage" , but then switch to a low impedance state when the gas is ionized. A substantial inductor (the ballast) will not allow a quick change in current, as would happen when the gas...

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You might want to look into electric discharge welding. This method of welding is instant. You attach one terminal to the (conductive) work piece, and the other terminal to your cut nail. Then, wearing goggles, touch the parts together and wait for the shower of sparks to settle. Done. I have...

A current source is defined as, well, a source of current that has zero ohms source resistance. Electrically, this current source, when it is paralleled with a resistor, behaves identically to a voltage source that is in series with that same resistor. The amount of equivalent voltage is the...

I found this site to be enormously helpful in all aspects of digital signal processing, including the FFT: http://www.dspguide.com/"

The https://secure.wikimedia.org/wikipedia/en/wiki/JFET" does not, so there is no "j" in the name (acronym). The mosfet operates on an electric field that propagates across a very thin oxide layer and thus enhances or depletes the charge carrier concentration on the other side. The JFET also...

For layout, I use http://freepcb.com/" . Otto