The best DC power corresponds to a transformers secondary A.C. rating.
A transformer with 12v secondaries will make 16.92v D.C. after it is smoothed,
minus two .6v diode drops from the bridge rectifier; let's call it 15.72v D.C.
This is the D.C. peak voltage. The real power comes on lower, at 10.8v,
[.90 * secondary A.C.] This I have verified thru experiment. The most wattage
is developed at the transformers rated VA voltage minus the diodes & minus 10%.
[Average D.C. voltage].
My question: is this peak voltage good for anything? It seems to me it's just
an annoying useless fluff voltage, that doesn't have much power in it, & that
gets in the way of your design, preventing regulator I.C. from utilizing it's
maximum voltage capacity, [40v for LM317, LM723, etc.]
Should it, or can it be considered for a voltage regulator's overhead voltage of 2-3v?
Maybe I should just be rid of it, perhaps with a pre-regulator?
Anyway, when working with a transformer secondary of 12v, the problem is merely annoying.
If the secondary A.C. voltage is 100v, then the peak D.C. voltage is 141v, yet average
D.C. voltage is 90v. That's a 51v spread!
Again, this peak D.C. is just fluff, not much amperage in it, but often, more than enough
voltage to fry a regulator I.C. How should I think about it?
A transformer with 12v secondaries will make 16.92v D.C. after it is smoothed,
minus two .6v diode drops from the bridge rectifier; let's call it 15.72v D.C.
This is the D.C. peak voltage. The real power comes on lower, at 10.8v,
[.90 * secondary A.C.] This I have verified thru experiment. The most wattage
is developed at the transformers rated VA voltage minus the diodes & minus 10%.
[Average D.C. voltage].
My question: is this peak voltage good for anything? It seems to me it's just
an annoying useless fluff voltage, that doesn't have much power in it, & that
gets in the way of your design, preventing regulator I.C. from utilizing it's
maximum voltage capacity, [40v for LM317, LM723, etc.]
Should it, or can it be considered for a voltage regulator's overhead voltage of 2-3v?
Maybe I should just be rid of it, perhaps with a pre-regulator?
Anyway, when working with a transformer secondary of 12v, the problem is merely annoying.
If the secondary A.C. voltage is 100v, then the peak D.C. voltage is 141v, yet average
D.C. voltage is 90v. That's a 51v spread!
Again, this peak D.C. is just fluff, not much amperage in it, but often, more than enough
voltage to fry a regulator I.C. How should I think about it?