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Hyperspace2 said:In the picture 1, the capacitor is grounded
In the picture 2, the capacitor is not grounded.
what are the purpose of this different models.
Advance thanks
Thanks for the reply.davenn said:the transformer core would also be connected to.
Dave
Hyperspace2 said:Thanks for the reply.
I didn't understand the logic of the transformer.)
I also have a few other question.
Logic 1
I was told that capacitor and resistor in parallel make RC filter network(low pass filter).
That would sense that the capacitor would behave high resistor for ac signal (because it has frequency) an it would allow only non ac signal.
Logic 2
The other logic told to me was that at first cycle of rectifier , the capacitor would get charged and second half of cycle ,it begins discharging to keep constant level of dc.
but I could not find the relation of both of these logic anyway.
I also have a question, How we determine the value of capacitor that we need to maintain the dc level. (or we could keep any)
Hyperspace2 said:is the purpose of the ground is to pass ac signal to the ground??
Thank you very much for your answer.sophiecentaur said:As far as the voltage (potential difference) across the output terminals there is no difference. The ground on one circuit is, as yet, uncommitted so you could get either a positive or a negative supply from it. If you wanted a negative out, you'd ground the '+' out and if you wanted a positive out, you'd ground the' -'. This is the same as when you connect a battery up to give a positive or negative Earth.
You would just have to look at the context of each circuit.
Aah I got it , I was mistaken .davenn said:well not in this case an RC filter would have one of the 2 components in parallel and the other in series
Dave
This example you have given (1000V and 1000+10v), this is the out of two different rectifiers ,isn't it?sophiecentaur said:This circuit would normally be used as a power supply (though no always). Many circuits (amplifiers / processors etc.) need positive and negative supplies and a ground in between. For that, you would use two rectifier circuits, connected appropriately.
An oscilloscope may or may not have one input of a channel connected to ground. The trace will just show you the potential difference between the two input terminals - they could be at 1000V+10V and 1000V, respectively and the scope will tell you 10V.
Hyperspace2 said:The next question, I have not tried connecting two terminals of batteries in oscilloscope .
let suppose 10 v battery is connected to the oscilloscope ,then it shows 10 v in oscilloscope ,isn't it?,( I confused that + and - sign of battery , the potential difference it will show will be 10-(-10)=20 V)
Oh I have a lot of confusion in my mind isn't it?
Hyperspace2 said:This example you have given (1000V and 1000+10v), this is the out of two different rectifiers ,isn't it?
The next question, I have not tried connecting two terminals of batteries in oscilloscope .
let suppose 10 v battery is connected to the oscilloscope ,then it shows 10 v in oscilloscope ,isn't it?,( I confused that + and - sign of battery , the potential difference it will show will be 10-(-10)=20 V)
Oh I have a lot of confusion in my mind isn't it?
Thanks for the reply.sophiecentaur said:My 1000V example was just to indicate that an ideal oscilloscope just shows the potential difference between two points - it will (/should) ignore the absolute potential wrt the ground of the scope. Note: there are two terminals on the input of any measuring instrument. If one (say the black terminal) happens to be connected to Ground, then the red one will measure the potential relative to the ground. If it is connected to a different potential then the red one will measure relative to that reference (black) potential.
If you live half way up a mountain then you can travel uphill or downhill i.e. increase or decrease your gravitational potential. The overall trip from bottom to top of the mountain is twice the height of where you live relative to the valley floor. It's the same when you consider Electrical potential and potential difference.
If you put two batteries in series then the + of the 'upper' one will be V above the middle point and 2V above the other end of the lower battery. If you choose to call the centre point Ground then you will have +V and -V from the two batteries. Likewise for two separate, interconnected transformer - rectifier circuits you can obtain a positive and a negative supply.
A bridge rectifier is an electronic circuit that converts alternating current (AC) to direct current (DC). It consists of four diodes arranged in a bridge configuration, hence the name.
A bridge rectifier works by using the four diodes to convert the AC input into a pulsating DC output. The diodes allow current to flow in one direction only, effectively converting the negative portion of the AC waveform into positive DC. The pulsating DC is then smoothed out by a capacitor to produce a more steady DC output.
The main advantage of using a bridge rectifier is its ability to convert AC to DC with high efficiency. It also has a simple design and is relatively inexpensive to manufacture. Additionally, it allows for the use of a center-tapped transformer, which can be more cost-effective than a full-wave rectifier circuit.
One limitation of a bridge rectifier is its high voltage drop, which can lead to significant power loss. This can be mitigated by using diodes with lower forward voltage drops or by using a transformer with a higher secondary voltage. Another limitation is that the pulsating DC output still contains some AC ripple, which may need to be further filtered for some applications.
Bridge rectifiers are commonly used in power supplies, battery chargers, and motor control circuits. They are also used in audio equipment, such as amplifiers, to convert AC signals to DC. Additionally, they can be found in household appliances, such as refrigerators and washing machines, to convert AC power to DC for their electronic components.