Capacitor as loading device
What exactly is the loading effect of capacitor? I found this as one of the main applications of the capacitor in electronic circuits.
The book pointed that the capacitor in the input of a transistor acts as a loading capacitor. How and what it loads and where does it load?
Some insight in any form will be really helpful.
The book pointed that the capacitor in the input of a transistor acts as a loading capacitor. How and what it loads and where does it load?
Some insight in any form will be really helpful.
Replies
-
pinankAs per my knowledge capacitors are used as fillers in electronics!
-
Jeffrey ArulrajYou mean filters right Yeah I agree to filters
But I found in a book that the capacitors are used to load in an electronic circuit
I figured that it loads the input AC signal without any DC interference to the input of the Transistor or FET I am still not clear about this though -
pinankAhh...no...they are primarily used as filters...either to filter out harmonics or as a lpf, hpf etc etc
-
Jeffrey Arulraj
Yup true But David Bell states That capacitors serve 3 purposepinankAhh...no...they are primarily used as filters...either to filter out harmonics or as a lpf, hpf etc etc
- Filters
- DC blockers
- Loading circuits
-
ABCD ABCDloading circuits? ... doesn't that mean it works as a load?
-
Jeffrey ArulrajWell I am not sure load is connected in the input section of the circuit right
mreccentricloading circuits? ... doesn't that mean it works as a load?
Loading occurs in the input and not in the output side where we use a loading resistance to increase or decrease the output impedance -
pugazh anandIs ter any similarities btwn impedance matching & cap loading?
-
Ramani Aswath
A fully discharged capacitor can act as a DC load till it is fully charged. It has effectively zero resistance to start with. After this its equivalent resistance increases and it just blocks DC. It will let through AC signals.ConquerorWell I am not sure load is connected in the input section of the circuit right
Loading occurs in the input and not in the output side where we use a loading resistance to increase or decrease the output impedance
I am not sure if this behaviour is what is referred to by David Bell. -
pinank
Sir but won't that be for a very small fraction of time..as the capacitor will charge up almost instantaneously(at least theoretically)A.V.RamaniA fully discharged capacitor can act as a DC load till it is fully charged. It has effectively zero resistance to start with. After this its equivalent resistance increases and it just blocks DC. It will let through AC signals.
I am not sure if this behaviour is what is referred to by David Bell. -
Ramani Aswath
You are right. Often that is all that is required.pinankSir but won't that be for a very small fraction of time..as the capacitor will charge up almost instantaneously(at least theoretically) -
ABCD ABCD
i counter this... It's not always a fraction of time. The rate of charging can be altered. So, i guess, it can be made so that the capacitor may act as a DC load for long time (in other words infinite time).pinankSir but won't that be for a very small fraction of time..as the capacitor will charge up almost instantaneously(at least theoretically) -
Ramani Aswath
Every capacitor has an RC value, which is a function for charging time. The R restricts the charging current. the total charge that can be held is decided by the C value. infinite time is possible only with infinite R. That is open circuit. Otherwise it is finite.mreccentrici counter this... It's not always a fraction of time. The rate of charging can be altered. So, i guess, it can be made so that the capacitor may act as a DC load for long time (in other words infinite time). -
pinank
The capacitor will always tend to reach its steady state value ie once it is fully charged it acts as a open switch and the rate can be altered by changing the time constant value.. But at say time equals infinity it will eventually act as a open switchmreccentrici counter this... It's not always a fraction of time. The rate of charging can be altered. So, i guess, it can be made so that the capacitor may act as a DC load for long time (in other words infinite time). -
Ahsanul haqueYou mean filters right Yeah I agree to filters
-
tanmoyacapacitors prevents loading effect means...... 'loading effect' means short circuiting of input source. if the circuit has low input impedence then the circuit will draw maximum current and this will result on short circuiting of input source.
-
Jeffrey Arulraj
Can you be more specific Cos How is the capacitor going to affect the impedance of the circuittanmoyacapacitors prevents loading effect means...... 'loading effect' means short circuiting of input source. if the circuit has low input impedence then the circuit will draw maximum current and this will result on short circuiting of input source.
Do you mean the DC impedance or the AC impedance -
tanmoyacapacitor is obvious to be AC impedence.... it is used for coupling of input too...
-
kumarrakeshitIn my point of view capacitor just like to holding electricity of certain time period. And we can replace battery with capacitor.
-
Jeffrey ArulrajBut how does it affect the input of my circuit.
What type of load does it provide to the input ciruit to which the capacitor is connected -
Ramani AswathIs this of any use?
#-Link-Snipped-# -
vamsi kancharla
capacitors are also used for timming purpose in an electronic cktsJeffrey SamuelWhat exactly is the loading effect of capacitor? I found this as one of the main applications of the capacitor in electronic circuits.
The book pointed that the capacitor in the input of a transistor acts as a loading capacitor. How and what it loads and where does it load?
Some insight in any form will be really helpful. -
kumarrakeshitSuppose if you are converting the ac to dc current then you must use the capacitor. then you can get desire output.
I will search your question answer please give me some time. friend. -
pinankcan this be the counter argument. Taking a simple circuit A BJt and AC signal is applied to its base. Now if there is no AC impedance, (CAPACITOR) the source will get Short circuited. And lead to damage of Bjt. Hence the capacitor would work as a loading device.
-
Jeffrey ArulrajSource has some reactive impedance so I am not sure what you are implying
Can you pls post a little schematic here to explain the scenario little more clearly?
And Load is generally at the output side and the trans impedance effect of it on the input source is really less in case of Semi conductors right -
pinank
Yeah u r pretty much right..I got it all wrong.. :/Jeffrey SamuelSource has some reactive impedance so I am not sure what you are implying
Can you pls post a little schematic here to explain the scenario little more clearly?
And Load is generally at the output side and the trans impedance effect of it on the input source is really less in case of Semi conductors right
You are reading an archived discussion.
Related Posts
These devices provide a very high degree of isolation between the primary windigns and the secondary windings of the core. They are really robust and offer very high electrical/ galvanic...
For those who missed the earlier parts, there are the links to them.
Prologue
Part 1
Part 2
Part 3
Part 4
Greetings Readers, as mentioned earlier this post I...
As the topic denotes its all about transmission system.A fluid coupling or a torque converter is usually used in place of clutch in a vehicle especially for automatic power transmission...
Hey guys, I saw some pictures of buildings and there were some of them with an unusual shape. Also in many movies we see buildings whose shapes are completely distorted....
Quote:
Go to https://www.mddionline.com/dare-dream-medtech-challenge to submit your medtech device and upload your files
• In 150 words or less, describe how your device works.
• In 150 words or less,...