Digital controller

[Peterae]

Here's a digital controller i built to study Spherics Bifilar coil using phase delayed pulses.

Construction Details will be added soon

Peter

[Fraser]

Nice build Peter! The DS1023 looks like a nice high spec device. Maxim produce some nice chips.

Have you played with any spherics like coil rigs yet?

[Peterae]

Hi Fraser

Good to see you.

I have a tetra sitting on the side lines for a rainy day but i need to build better fet modules for this really before i go back to it.

So many things to work on, i still want to revisit pulsing bifilar coils with some fresh ideas.

I also have an anomaly to work on, when i was pulsing a bifilar coil using an iron wire unterminated delay line, this was very interesting but the delay line kept sparking over and burning up,but before it did i had a large amplitude pulse showing up a bit like the one i found pulsing the bifilar with my controller, i need to get back to this one and document it.

I found the pulse and explosions in the wire using Spherics bifilar setup.


Maxim do some nice chips alright, but they are always dam expensive but then i guess you pay for what you get.

[Peterae]

Sorry for resurrecting this old thread but i need to store 2 pictures here, 1 is a ruff schematic for my pulsed delay experiments, the other is a circuit of my fet driver circuits although i now use MCP1406/1407 which i have found better for the fet driver chip.

Mostly i used a bifilar and pulsed each bifilar with their own fet stage, but i had much more serious results using only a single wire coil and connecting bot fet drains together to drive the single wire coil.

[ion]

I'm curious about the large difference in the current metering circuit since the PW is the same for each.

[Peterae]

Dont worry about the meters they are not really needed, although they can make a difference to the effect seen.

[BEP]

At one time I had a similar experiment and setup going. I used non-inductive shunt resistors so I could monitor the two currents on my scope using differential probes.

The reason my shunts didn't have the same resistance was because one of the windings was copper and the other Nitinol. Nitinol has a much higher electrical resistance than copper.

Except for for the first few coil forms breaking, the results were as expected.

Thanks for refreshing this topic. I've been thinking about repeating the tests with the finer phase shift/delay control supplied by Peterae.

[Peterae]

Definitely worthy of further research  

The weirdest result i had was the light bulb in the ceiling started resonating at quiet a high pitch, i don't know why it did that it was incandescent 60W

If that was the small pic controller i built be carefull the PCB layout was hard to get going and wrongly layed out, i remember doing some serious track relaying under the 7seg displays, although if you follow the circuit diagram that was good  

The controller above was much better but more expensive due to the 4 delay chips used, that LTC chip oscillator caused me headaches i could not find math routines that were fast enough, if i remember i had to do 24 decimal place maths but luckily the pic has real fast BCD add and subtracts so i rolled my own long decimal divide and multiplication routines in assembly which were much faster than C or any other floating point routines i could find in assembly.
Because all the maths was done in Binary Coded Decimal it was a breeze to display   without the needed floating point to ASCII conversion.

I don't even know if my eyes are good enough to hand build it now that LTC was a bitch to hand solder, 8 pins and very small package.

[BEP]

I just spent my whole Saturday replacing a couple dozen 244 pin SoC's on test fixtures (by hand  ).

The new ones sport some qualities applicable here. I may just build a rig using one of these things, a fet driver and fets. Hell, they even speak ZigBee, WiFi and EtherNet.

Not that any communications would function during the experiments  

Light bulbs?

I remember once during a run the stereo three rooms over started playing at full volume and woke everyone up (it was about 3 in the morning)....

However, making an incandescent act funny is pretty impressive

[Peterae]

Yeah the lightbulb playing a tone was strange, never seen it since, shame really if i could have controlled the tone then i would have had a cheap synth. Just add more bulbs around the room for surround sound

[BEP]

Maybe you were touching on EMP effects. I've blown them out but never made them sing.

[Grumpy]

"Two pulses with one delayed" is similar to the two frequency method that Tesla used to produce ball lightning in which he used two transmitters to impose a high frequency discharge over a low frequency one.  The Corum brothers reproduced this effect.  Both result a very high voltage pulse.