Digital Circuit Diagrams+FETs+Drivers

[bob.rennips]

Hi Bob,

here is a further updated schematic.  Does this include all your TPU desires?

Regards, Earl

Yes indeedie - fantastic work. Roll on weekend!!

[Earl]

Hi All,

Attached is my newest idea with schematic.  It can rapidly fire any number of coils around a circle.  And using two can produce counter rotating fields.  I call it the rapid fire Rat Race controller.

In a setup that uses counter-rotating fields, the two clock inputs could be tied together making the fields frequency and phase locked together.  The the generator can be swept over a wide frequency range, even up to 30 MHz.  No adjustments are needed.

I believe that the physical placement of the coils would give a certain, fixed phase offset, while choosing a different physical starting point would give a different phase offset.

If driven from two different frequencies, there could be a harmonic relationship to the clocks: i.e. 1:2 or 1:3 or 1:4 - it is easy with digital dividers to pick whatever ratio you fancy.

If using two independent generators instead of one generator together with a divide-by-N, then both frequency and phase can be varied.

Between the Rat Race and the FET driver, a D-flip/flop, connected as a fast monostabile, could be added.  A 74HC74 could give very narrow pulses as narrow as ~10 ns.  I will add this in the next schematic version.

Regards, Earl

[Earl]

IGNORE THIS INCOMPLETE SCHEMATIC, SEE FINAL SCHEMATIC BELOW.
I SOMEHOW SELECTED THE WRONG IMAGE WHEN UPLOADING.

For those who think 3 or 4 coils is much too few, here is a circuit that easily drives 4, 8, 16, 32, 64, 128, etc. coils.  It is the rapid fire Rat Race version 2.  It fires one coil after the next, no pause.

You can also use two of these, one clocked at f, the other at 2f or 1/2 f.

Enjoy.  Earl

[Earl]

Hi All,

You will have difficulty building a faster or narrower pulser than this.

As being somewhat locked inside the box, it is only natural for us to think of FET drivers and power FETs.  After all a lowly IC can only deliver so much current.  But if we stick to a very narrow pulse and a minimum amount of wire we won't even approach the current limit of the IC.  So why are we so scared?

Because we are trapped into the mentality of big power in to get big power out.  We say we believe in free energy, but we are afraid of zero input power.

Either 12V p-p is enough, or maybe a boost with some electrostatic or magnetostatic bias is necessary.
20kV will certainly be enough, hehehe.  Don't overdo it, go slowly with any bias.  High voltage can cause a short lifespan, not only for ICs, but also experimenters, so be careful.  One hand for the circuit, one hand for the pocket.  If you are inexperienced or careless, stay with voltages under 24V.

By the way, if you use an open circuit transmission line, and you cut off just one side so the two lengths are not equal, 1mm gives a delta t of about 4 picoseconds.

Enjoy and post any feedback from your experiments.

Earl

[Earl]

HI,

somehow the wrong image got selected.  Here is the correct image.

Ignore the previous schematic.

Earl