[Amps] Mod xmfr

[craxd]

Steve,

There's several things that has to be known;

The impedances of the primary and secondary (what is being matched to 
what?).
The voltage in the windings and the current to determine the power.
The power in watts next.
Then the core determination.
Last, the number of turns.

The transformer will use the standard impedance matching formula but the 
primaries number of turns is figured by the voltage, frequency, flux 
density, and core area. The ratio and the square root of it will 
determine the secondary number of turns.

The core area is determined by the power in watts, flux density, and the 
frequency. The core lams are determined by the frequency (thinness and 
material-steel type). Most cut cores are all the same material and 
thickness so an EI core is a better choice here. The correct type of 
steel, lam thickness, and amount will keep the core from saturating at 
full load.

The current capacity is determined by how many circular mils per ampere, 
usually 750 for this case. The wires insulation, and insulating papers, 
sets the voltage rating and maximum temperature.

Next, it's trial and error to see which lam will make a core that all 
the windings will fit inside its windows. An efficient core can made 
this way, but using cut cores, you have to take what they make unless 
it's a custom.

Will Matney


Hey guys:

Thanks for all this education on the plate modulator for my 2 x 813's.

Seems to me that:
1.  current carrying capability of the wire is first;
2.  turns ratio ( creating impedance ) comes next;

Just how difficult would it be to make one?

Our predecessors did.

E/I core or over/under on one core?

I understand Hypersil cores are easy to get.

Might have a challenge counting high numbers...hi hi

73
Steve
WA2TAK