Which symbol on earth represents CURRENT SOURCE?

[bittware]

Hello experts,
I am always wondering which symbol represents CURRENT SOURCE. It looks a simple question, but it seems a little chaos in my mind.
I think there should exist standard that most people should follow.
I'll be very appriciated for any one could clarify it.

Best regards
Bittware

 

[flatulent]

It all depends on which country the diagram is drawn in. Your two versions are not all that exist.

 

[bittware]

It all depends on which country the diagram is drawn in. Your two versions are not all that exist.

Does there exist any standard to follow?
Say in American, might be IEEE, ANSI, JEDEC or ISO.
In Europe, might be DIN or IEC.
Could you give me some clue about which standard document has the description of such symbol definition?
Thanks a lot.

 

[devrimaksin]

There are both symbols for current source
but they are not same,
the one on the left is used for bias current kind of
current source representation.
the one on rigth (without the arrow though) is used for noise current symbol. For noise current there is no direction but it is high impedance (hence no current and horizontal bar).

 

[bittware]

There are both symbols for current source
but they are not same,
the one on the left is used for bias current kind of
current source representation.
the one on rigth (without the arrow though) is used for noise current symbol. For noise current there is no direction but it is high impedance (hence no current and horizontal bar).

I can't imagine how to distinguish them in a specific schematic.:-(

 

[bittware]

Here comes another participant, more confusing. Who can help me out?
What kind of standard do these symbols follow?
Thanks in advance.

 

[sunsina]

In The PDF File the Symbol that Contains two Joint Circle is Current Attenuator.
Which Attenuates Current and in most Cases you can see this symbol in IC Schematics and High Power Distribution Schamatics.


The Symbol in the Middle Is Most Like Finger Touch Symbol or Ammeter Symbol.

The Last Symbol Which is circle with Arrow in it is Independent Current Soure
,which Means the current that it Produce is not dependent to its' Voltage.

 

[bittware]

In The PDF File the Symbol that Contains two Joint Circle is Current Attenuator.
Which Attenuates Current and in most Cases you can see this symbol in IC Schematics and High Power Distribution Schamatics.


The Symbol in the Middle Is Most Like Finger Touch Symbol or Ammeter Symbol.

The Last Symbol Which is circle with Arrow in it is Independent Current Soure
,which Means the current that it Produce is not dependent to its' Voltage.

Hello sunsina,
As you said, these three kinds of current source symbols could coexist in the same schematic. Right?

 

[juana]

Could you give me some clue about which standard document has the description of such symbol definition?

maybe some of the following
IEEE STD 315-1975
IEEE STD 315a-1986
IEEE STD 91a-1991