A new look at transformers.

Back in 2016 I made a few post about transformers. My one follower made one for his AM modultor. At that time I linked a book with the formula and tips on winding your own. Since then the link has been broken. It seems someone at the blogger control center decided the link was " unaceptable content. Feb 20 2016 I posted a little data showing how thw mutual inductance effects the operation. Basically as long as the primary has sufficient inductance you can simplify the process. One old rule of thumb is to use 5 turns per volt BUT this calls for a large piece of iron. I use 10 turns per volt to insure the primary is large enough. The transformer I wound has 120 volt primary and 10 turns per volt. So 1200 turns for the primary. I wanted 6.3 volts on the primary. so I need 63 turns ( used 65) for the secondary. Once I made the transformer I tested the inductance and "built" a circuit in LTspice to test the design. The primary was 3.5 Henry and the secondary was 18 milli Henry. Spice says I should get 7.7 Volts. Next I will power it and see..........