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Author Topic: What are the difference between soem condensator  (Read 500 times)
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Good morning,

I am working on a small private project and I miss some basic knowledge about condensatoir.
My question will be very basic, but that issue put me into doubt

I have a schematic and I can see diffrent symbol of condensator.
I am also working with Fritzing which is an opensource PBC maker. In order to not make error on componment I would like to ask you the difference between some condensator

Could you open the fisrt pdf file http://www.hello-web.net/temp/PowerCell.pdf and look at C1, C2 and C3. All have a different representation.
Also, is it true that the Output pin of U2 (VCC) has to be "wired" to the the Resistor R2 (VCC) in my PBC?

Could you also check the second file http://www.hello-web.net/temp/Pro-Mini.pdf and look at C19, C10 and C2.
And what is the element between pin 7 and 8??
I suppose that C19 has a polariry and why C10 has a smaller bar.

With Fritzing, I can select a condensator which show a voltage. Why voltage are not show in the linked shematic?

Could "highlight" me on showed condosator?

Many thankf for your help
Cheers
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google helps in 2sec
http://www.learnabout-electronics.org/ac_theory/capacitors01.php

the element is a resonator

i think the voltage means that the capacitor is resistant up to a voltage of that value
« Last Edit: March 02, 2013, 08:14:51 am by lax123 » Logged

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I have a schematic and I can see diffrent symbol of condensator.
Most of the world calls them capacitors. 

I am also working with Fritzing which is an opensource PBC maker.
I think you mean PCB.

Could you open the fisrt pdf file http://www.hello-web.net/temp/PowerCell.pdf and look at C1, C2 and C3. All have a different representation.
I don't understand what you mean "different representation."  The schematic symbol is the same for C1, C2, and C3.  The only difference is the capacitance value.


Also, is it true that the Output pin of U2 (VCC) has to be "wired" to the the Resistor R2 (VCC) in my PBC?
R2 is not connected to VCC.  It is connected to Vbatt which is completely different from VCC.


Could you also check the second file http://www.hello-web.net/temp/Pro-Mini.pdf and look at C19, C10 and C2.
And what is the element between pin 7 and 8??
A crystal.


I suppose that C19 has a polariry and why C10 has a smaller bar.
C19 is an polarized electrolytic capacitor (generally aluminum) and C10 is a non-polarized capacitor (ceramic).


With Fritzing, I can select a condensator which show a voltage. Why voltage are not show in the linked shematic?
Capacitors have a rated voltage.  You should select a capacitor with a voltage rated higher than the voltages it will see in the circuit.   Knowing this, there isn't much need for calling out a rated voltage on those simple schematics.
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Ok, good, thank for that information.
May I ask you again one thing?
On that file http://www.hello-web.net/temp/PowerCell.pdf what is JP9. Could it be two hole where I can solder a 5V and GND wires to charge the battery (IN).

What is the difference between JP1 and JP12. I suppose the battery will be plugged here, but in which one?

Cheers
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JP stands for "Jumper".  It identifies some type of physical connection.  Often JP is used for connectors.  Could also be header pins.  Or JST connectors, etc.

Could it be two hole where I can solder a 5V and GND wires to charge the battery (IN).
Yes

What is the difference between JP1 and JP12. I suppose the battery will be plugged here, but in which one?
You plug the battery into one.  Then the other "connection" is for whatever you want to power from the battery when it isn't charging.


You should keep in mind that the TPS61200 chip is a switching regulator.  It requires some special layout considerations which are spelled out in the TI datasheet. 
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Hello
Thank for all information and excuse me for my misspelling (PCB, capacitor).

Ok then I can consider JP12 and "delete" JP1. I would like to have a JST connector with a Li-ion battery always plug. When I plug the USB cable it's charging and power my project. When I remove the USB, the battery power my project.

Ok I understand there is no VCC. Then if look at the power cell file http://www.hello-web.net/temp/PowerCell.pdf, there is two schema. The Pin 3 of U1 should be wired to pin5 of U2 are they are VBATT.

Isn't?

And JP2 will power my project.

I do not want to have my project in 3.3V. I suppose I can delete R1 and wire R7 and R6.

I just discover something else. I can read GND and GND1. GND should be the GND of my Li-ion, but then GND1?

Thank for all
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Ok I understand there is no VCC. Then if look at the power cell file http://www.hello-web.net/temp/PowerCell.pdf, there is two schema. The Pin 3 of U1 should be wired to pin5 of U2 are they are VBATT.
Yes, that is the same node.


I do not want to have my project in 3.3V. I suppose I can delete R1 and wire R7 and R6.
Yes

I just discover something else. I can read GND and GND1. GND should be the GND of my Li-ion, but then GND1?
The reason for two grounds is because you are using a switching regulator.  The chip separates "logic" and "power" ground.  You should be putting a ground plane underneath the TPS chip.  All of the "GND" connections on both schematics need to be connected to that plane.  All of the GND1 connections are "logic" should be connected together, then with a single point to the GND.

Some of this is explained on page 13 of the TPS datasheet:
http://www.ti.com/lit/ds/symlink/tps61200.pdf
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Dear Jaimes,
Thank for your clear explication. It's very nice
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