How can you measure the inductance? Incase I choose to make my own
tranformer? The problem is I will need 2 (for current requirements) and
after the regulators the magnetics are the most expensive part of the
circuit by half.
You can get meters, looking like digital multimeters, that can measure this.
they are in about the same price range as digital multimeters.
the professional version is a "resistance, inductance, capacitance measuring bridge"
but a simple component meter is ok.
You can even get multimeters with inductance measuring range.
Another approach is with a scope and a ac signal.
But you can buy ready-made inductors for which the value is known.
What do you need the 12V for?
You should be able to use 5V components, or use a regulator only limiting, no stepup,
for motors (fans, maybe harddisk).
If you take apart a old PC power supply you will find a inductor which carries one winding
for 5V and one for 12V, maybe even one for 3,3V.
you can use it , using the 5V winding for primary and the 12V winding for secondary.
ST
