What a great moderator!Just so as everyone knows Billy Mayo and DexterMccoy are using the same computer.
Draw what conclusions from that you will.
What a great moderator!Just so as everyone knows Billy Mayo and DexterMccoy are using the same computer.
Draw what conclusions from that you will.
Yes, let's get the OP on the right path, which includes using clear and well-defined terminology (while acknowledge that there is, sadly, in practice some common deviations from it).Either. If there is no resistance (real part) they are equivalent, and I did specify 'absolute' impedance. Bring non-ideal capacitors into the mix sure you have ESR creeping in, but let's start with the basics to get the OP on the right path.
Hardly. The ESR of a cap can become a significant part of the impedance without there being anything wrong with the cap at all (other than possibly it being a poor choice for a given application). Just as the ESL can (and will) make the part look like an inductor above a certain frequency without there being anything wrong with the cap at all.the ESR of the cap should be a negligable value. if it is large enough to affect the reatance into impedance, throw the broken theing away, its bad;.
I know nothing about any of that.A lot of posts drawing conclusions and sentences upon the OP and a member have preceded this one.
These have been moderated.
In that case I apologize, I felt it was only fair to notify the members here about the nature of who they were trying to help.True, but this has nothing to do with branding the OP a troll and a disruptive member.
Stable DC never passes through a capDC *never* passes through a cap.
It would be rather unusual for the coupling capacitor voltage [say] in a typical BJT amplifier circuit to be a pure ramp, even when the input signal is a slowly increasing ramp. The capacitor voltage would be modified by the equivalent source & terminating resistances - such as the stage input resistance "seen" by an inter-stage coupling capacitor.Stable DC never passes through a cap
But a ramp DC voltage to a peak voltage or a sweep DC voltage to a peak volt, is a change of voltage , even tho it's DC
Example:
DC voltage ramp or sweep
ramps or sweep a DC voltage from 0 to 10 volts
The capacitor will PASS the DC voltage when its going the the change of voltage from 0 to 10 volts DC
The Capacitors ESR changes when there is a change of voltage?
The Capacitors Reactance or impedance changes when there is a change of voltage?
It's a change of DC voltage
I know in electronic books they just focus on the change of AC voltage that passes through a capacitor
You are trying to make fine distinctions where the course distinctions themselves are not strongly defined.Stable DC never passes through a cap
But a ramp DC voltage to a peak voltage or a sweep DC voltage to a peak volt, is a change of voltage , even tho it's DC
Example:
DC voltage ramp or sweep
ramps or sweep a DC voltage from 0 to 10 volts
The capacitor will PASS the DC voltage when its going the the change of voltage from 0 to 10 volts DC
The Capacitors ESR changes when there is a change of voltage?
The Capacitors Reactance or impedance changes when there is a change of voltage?
It's a change of DC voltage
I know in electronic books they just focus on the change of AC voltage that passes through a capacitor
So I was wasting my time.But I did offer additional explanation in my post#5 and asked a particular question in my post#13 with further offer of help.
I have not had a response to that.
I sense you are not alone in that respect. There seems to be a predilection for obtuse behavior on the part of some.So I was wasting my time.
Correct. Since:on the test fixtures at my work there is a switch that will ramp or sweep a DC voltage up or down. For series capacitors that are inbetween or coupled between stages of the circuit will PASS this ramping or sweep up DC voltage , but once the DC is stable , the series cap BLOCKS the DC voltage
Exactly. Say your voltage changes 1 volt per second across a capacitor of 1 uF. Then the current will be:My question is when the DC is ramping or sweeping up or down to a peak voltage. This is a rate of change of the DC voltage
I do not follow.The Capacitor will DC this DC voltage because its ramping or sweeping up to a Peak voltage , yes unipolar waveform.
"Reactance" is a term used then doing "AC analysis." When discussing a changing DC wave you are doing DC analysis so it is not useful to discuss reactance. A reactance is only defined for a single frequency sine wave, and if you are not using such a wave the analysis technique is not very useful.The Capacitor's reactance and ESR will change in value when their is a ramp or sweep DC voltage apply to a cap?
True.Because a series capacitor will PASS a DC voltage that is ramping up to a peak voltage, which is a rate of change
The reactance is undefined unless you have a sine wave.But I don't know if the capacitors reactance and ESR changes when it's passing a DC varying voltage
True, except remove "bipolar." One can have say 1V of AC riding on 100V of DC (not a bipolar wave) and send it thru a cap. The cap can be analyses as if there was just 1VAC across it. (Disclaimer: add "in the steady state" if you want to ask about the turn on transients.)I think a capacitors reactance and ESR only changes when their is a AC waveform or bipolar waveform right?
Yes. Double the frequency of the driving sine wave and you half the reactance.When a capacitor's reactance and ESR changes , then the in-circuit's impedance changes?
What is it called when doing DC analysis since it's not called Reactance?"Reactance" is a term used then doing "AC analysis." When discussing a changing DC wave you are doing DC analysis so it is not useful to discuss reactance.
The Reactance and ESR goes lower when the frequency is higher? why is thatDouble the frequency of the driving sine wave and you half the reactance.
by Aaron Carman
by Jeff Child
by Jake Hertz
by Jake Hertz