Hello.

l draw a circuit design like top of picture.

l wondered that is it normal or qualified configuration ?

or invoked at mass production ?

Thank you

 

Your questions, the context of them unclear.

What do you mean by this

l wondered that is it normal or qualified configuration ?

Same for

or invoked at mass production ?

Post more detail, like why did you draw this, whats it for ?

Regards, Dana.

 

Welcome to AAC!
That circuit is entirely conventional.

 

Mass production? No. A voltage divider is an element of a circuit, not an end product.

What do you think a voltage divider is used for?

Bob

 

What is the function of capacitor?

 

The capacitor supplies reactance.

Xc = 1/(ωC)

When ω (angular frequency) becomes low, the reactance Xc approaches infinity.

Xc = 1/(ωC) → 0 as ω → ∞

Xc = 1/(ωC) → ∞ as ω → 0

 

The capacitor supplies reactance.

Isn't that only true if the input voltage is varying? Since none of the voltage is called out(12V no indication of what type of voltage AC, DC, audio, etc) does capacitive reactance even get considered?

 

If the input voltage is varying, that means that ω is non-zero.

If the input voltage is absolutely steady, ω is zero and Xc is infinite, i.e. it has no effect on the voltage divider.

If the input voltage is changing, ω is no longer zero, Xc has some finite value and affects the function of the voltage divider. The effect is that Xc attenuates the changing voltage (the AC part) while keeping the DC part constant.

That is, it is a low-pass filter to reduce noise at the output of the voltage divider.

At very high ω, for example RF interference in an audio circuit, Xc approaches 0 and filters out the RF interference while allowing the LF signal to pass on to the output.

 

View attachment 149578

Hello.

l draw a circuit design like top of picture.

l wondered that is it normal or qualified configuration ?

or invoked at mass production ?

Thank you

Hard to tell what you are asking. What is a "normal" as compared to a "qualified" configuration.

What is being "invoked" at mass production? Mass production of what?

If CHK an input or an output? Assuming that P_12V refers to a DC power supply, then your diagram is, indeed, a voltage divider and CHK would be it's output. By convention, outputs are drawn on the right side of circuits while inputs are drawn on the left. So in that since it is flipped from what most people would expect.

Do you have a specific purpose for the capacitor? Without knowing anything else about the intended application, that capacitor might serve a useful purpose if it stabilized the output voltage against minor variations in the load. But in other applications having it there might be detrimental.

 

A voltage divider by pure definition is just a series of resistors, two or more that provide reference voltages. The capacitance is not needed in a pure DC situation. However, in an AC situation the capacitor does have some purpose, but to be honest, I don't know for sure. So I can't say more on this subject.

 

What is the function of capacitor?

l added a capacitor to reduce errors caused by noise in voltage measurement.

 

Your questions, the context of them unclear.

What do you mean by this

Same for

Post more detail, like why did you draw this, whats it for ?

Regards, Dana.

l meant that ls it a common circuit ?

 

Hard to tell what you are asking. What is a "normal" as compared to a "qualified" configuration.

What is being "invoked" at mass production? Mass production of what?

If CHK an input or an output? Assuming that P_12V refers to a DC power supply, then your diagram is, indeed, a voltage divider and CHK would be it's output. By convention, outputs are drawn on the right side of circuits while inputs are drawn on the left. So in that since it is flipped from what most people would expect.

Do you have a specific purpose for the capacitor? Without knowing anything else about the intended application, that capacitor might serve a useful purpose if it stabilized the output voltage against minor variations in the load. But in other applications having it there might be detrimental.

l added a capacitor to reduce errors caused by noise in voltage measurement.

so l wondering that is it normal/common circuit.

 

Typically in a theoretical circuit one doesn't consider noise. In practice it may be wise, but in a DC circuit powered from a battery, there isn't much noise. When designing or engineering a circuit noise does need to be considered, don't think I'm saying it's not necessary. But when discussing things like theoretical voltage dividers, we're just going to talk about how the resistors divide the voltage (the voltage drop based on the total current through the whole circuit).

 

The capacitor as shown in the voltage divider circuit can have many functions, depending on the circuit application.

If the voltage divider's purpose is to serve as a voltage reference, for example, ADC reference or analog comparator threshold, the capacitor can serve to reduce circuit noise.

If the voltage divider's purpose is to attenuate an audio signal, for example, the capacitor can serve as a high frequency shunt to attenuate high frequencies.

 

Typically in a theoretical circuit one doesn't consider noise. In practice it may be wise, but in a DC circuit powered from a battery, there isn't much noise. When designing or engineering a circuit noise does need to be considered, don't think I'm saying it's not necessary. But when discussing things like theoretical voltage dividers, we're just going to talk about how the resistors divide the voltage (the voltage drop based on the total current through the whole circuit).

So in the DC circuit's voltage divider, capacitor is no necessary.

Thank you

 

The capacitor as shown in the voltage divider circuit can have many functions, depending on the circuit application.

If the voltage divider's purpose is to serve as a voltage reference, for example, ADC reference or analog comparator threshold, the capacitor can serve to reduce circuit noise.

If the voltage divider's purpose is to attenuate an audio signal, for example, the capacitor can serve as a high frequency shunt to attenuate high frequencies.

my circuit is a part of automotive circuit.

and its purpose is voltage monitoring.

 

Now that we know a purpose to the divider then yes, the capacitor is highly desirable. Automotive DC is inherently VERY noisy. Therefore, since we are no longer talking theoretical then yes, the cap does serve a purpose. But this is the first time I read anything about a specific application.

 

Now that we know a purpose to the divider then yes, the capacitor is highly desirable. Automotive DC is inherently VERY noisy. Therefore, since we are no longer talking theoretical then yes, the cap does serve a purpose. But this is the first time I read anything about a specific application.

l should mentioned specific application at first time

but l forgot to mention eariler. my mistake..

l appreciate your helping ! ! Thank you

 

So in the DC circuit's voltage divider, capacitor is no necessary.

Thank you

That is emphatically incorrect.

You may have a constant DC voltage being monitored by an ADC circuit. A capacitor can be very useful for reducing noise.

You may have a battery feeding a circuit, for example, the power source in an analog or digital circuit. A capacitor (or more than one capacitor) across the power supply rails is absolutely essential.