The Master Of Magnetics "Steven Mark"

[giantkiller]

@MOSfet item

Hi all,
I had a similar problem. I followed CTGlabs coil driver part of his circuit. All the drains were connected thru 1 hi-watt resistor. I have 8 drive channels and all the n-channel FET outputs stayed low while clocking. I swapped out the MOSfets with TIP41As. and same problem. I finally put all the Collectors thru their own resistors. My controller is now working. The TIPS can handle 40 volts @ 6 amps. That is ok. My avatar coil being wound of 16 gauge multistrand on iron core is too big for my current circuit. I can add higher power stage if neccessary. But now all of you that have wound smaller gauge coils are good. The drive requirements are easier. I am looking at the last SM TPU diags from Mannix and am thinking that at 10 cm diam a certain power factor is needed which requires a certain level of power to it. The diam is also part of the wavelength. I am stuck with wanting to shrink the diam to lower the wire gauge for less of a power requirement. But that might not match up with the required freqs with the wavelength of the diam. Going in circles here because I believe I am correct about the specifications. But I want, what I want, what I want.

Anyway, with the controller build stage out of the way I ponder coils now. I can definately see the impact of iron core saturation with what I am running. So that is the switch to Sm TPU air core/ wire core at this time.

--giantkiller

[dutchy1966]

Hi everyone,

In the latest schematics Mannix sent there are squarewave pulsetrains of 150 to 900 Mhz for up to 3 overlapping wavefronts.
Does anyone know of a schematic to make these fast pulsetrains?
I guess thinking along the lines of 555 timer doesn't get us anywhere....

Regards Dutchy

[giantkiller]

Hi everyone,

In the latest schematics Mannix sent there are squarewave pulsetrains of 150 to 900 Mhz for up to 3 overlapping wavefronts.
Does anyone know of a schematic to make these fast pulsetrains?
I guess thinking along the lines of 555 timer doesn't get us anywhere....

Regards Dutchy

Here: http://www.crystek.com/ just discrete parts. A ready made device might be expensive.

--giantkiller

[giantkiller]

@Marco, you are amazing! And humble too, naming it after Jacob.
So many questions. Schematic forth coming?
So each layer is identical and those are LEDS off to the right?
What gauge wires, turns. I see 4 segments. What are the cores? Air, wire? If you read my posts today i am ready to fire up the  next rendition or for that fact any other design.
I don't wan't to waste time without specifications. Great pictures.

--giantkiller

[Jdo300]

Hello All,

Does anyone have all the formulas that were used to calculate the resonant frequency of the toroid and a loop antenna? I saw some formulas here a while back but I can't remember which ones we though would be pertinent to the build. For those who are building coils, are you using the specs for the toroid itself to tune to a set frequency or are you basing the size on the collector coil diameter (like a loop antenna)?

As soon as I fix the booboo I made with my MOSFET I will be doing a few more simple tests with my transformer, and then I will begin to make the coil setup. I want to do a few calculations first though to get a ballpark idea of what frequency range it will work at, though I won't be all that bent out of shape over it. To construct my coil, I will be using some 122 strand, 30 gauge litz wire that I bought on eBay a while back (see picture). It will be used as the collector coil but I only have 10 feet of it to work with so I am trying to determine how many loops I will need to make for the collector coil. I am shooting for Mr. Mark's 4in TPU so I won't have to spend forever winding the toroidal coils (by the way, AWESOME COIL marco! Never would have thought to use Cat5 cable). I bought some clear vinyl plastic tubing from the hardware store to use as a former to wrap the toroidal coils onto. I will slit the tubing along its length to wind the collector coils on the inside and then I'll wrap the control coils around the outside :-). But if someone could assist me in figuring out the dimensions for this, it would be greatly appreciated.

God Bless,
Jason O

P.S. Forgot to mention that I am interested in figuring out the resonance frequency so I can roughly estimate what size wire and how many turns for the collector and control wires of the 4in TPU.