wrote:
2 questions about a fully DC Sine Wave....let's suppose you have a DC
Sine wave which varies from +5V to +15V peak-to-peak going into a load
with R, L, and C components.....

Question #1:
Is the load's impedance a function of R, L, and C (and wave frequency)
or is it simply just R (i.e. Z=R)? In other words does non-resistive
impedance (L + C) really only matter with an AC signal OR anytime
voltage varies periodically (even if it is all DC)?

Yes, the load impedance is a function R, L, C and frequency. L and C do
matter anytime the voltage varies even on non-periodic wave and even if
the voltage is always positive. On a pure DC voltage (constant,
non-varying), L will represent a short-circuit while C will represent
an open-circuit.

If the R+L+C are all in series, the +5V to +15V sine wave will, during
the transient phase, first charge the capacitor to +10V, then (during
the steady-state phase) the current will start to behave as a normal
sine wave (reversing directions) even if the driving voltage never goes
negative.



Question #2:
Would a "regular" negative peak detector ciruit, like shown he

http://www.elektroda.net/cir/index/D...CTOR.htmgative


work for the DC Wave described? Will it output +5V or do negative peak
detectors only work for AC signals?

The circuit is pretty much unconventional (but sure smart!). No, it
will not output +5V. The circuit is meant to detect only negative
voltages and can only output zero or negative voltage. But I suggest
that your try building it and see what happens. You might just get
lucky.


Thank you.

You're welcome. I hope you now understand that your +5V to +15V voltage
is better called "varying DC". I've never seen an EE book that will say
"DC Sine Wave" for the voltage you described, and rightly so because a
sine wave implies reversing directions.