--- In Electronics_101@..., "Keith" <keith@k...> wrote:
--- In Electronics_101@..., "Bruce Carter" <brucec@m...>
wrote:
Probably. Give me a link to the data sheet and I will look it up
for you. Transformers are usually for isolation, if you are willing
to give up isolation you are probably all right.
As for inductors / transformers on these application notes - DON'T
try to do it yourself! The characteristics are usually so
intertwined that the manufacturer recommends vendor and part
number. Substitute and the circuit won't work. They usually sell
evaluation boards with the necessary parts - a very annoying, but
necessary investment for the hobbyist, because your chances of
getting samples of the oddball inductors, special capacitors,
schottky diodes, wierd transistors are almost zero - much less
making a PC board layout without parasitics that will ruin your
design.
I disagree. I often wind my own inductors because what I want usually
doesn't exist. For power inductors I quite like the Micrometals E
cores becuase they have high energy storage without having to mess
about with gapping and are cheap. If you want gapped ferrites then
MMG Neosid do a good range.
To answer the issue of measuring the inductance, it is easy to do. I
often use resonance - put a known capacitor across it, a series
resistor and hook it up to a scope and signal generator. However, you
shouldn't need to measure it. Design it, wind it, use it.
I am not quite sure of what you want to get out of the regulator. If
it is for car use and it runs off 12V, why regulate? Does the
equipment you want to use require a very precise voltage?
Keith.
Yeah it's a good practice to breadboard and build your own inductive
elements/transformers. I have used a pulse source and scope to measure
the charcteristics of power inductors by measuring the slope and the
point at which it saturates. The staturation point is as important as
the inductance in most power supply circuits.
