What is the significance of different colored circles on a circuit diagram?

[mearvk]

Hello all. This circuit diagram uses empty and full circles and also no circles. Is there a difference between a white circle in this diagram and a black one? I'm referring to the typical application diagram.

http://www.datasheetcatalog.org/datasheet/SGSThomsonMicroelectronics/mXqwvzw.pdf

Thanks.

Edit: Those are the pins on the IC. Nevermind. :-)

 

[jedishrfu]

the white circles signify the pins of the integrated circuit. They show the insides of the circuit and then a box with white circles for the pins and then the outside circuit. the black circles represent circuit connections.

There are also white circles in the switch these indicate contact points. wires that cross but don't connect use a little half circle to indicate one wire crossing over another wire.

 

[mearvk]

Thanks jedi.

Next question is about connecting the signal inputs. If you look at pin 7 and 13 and 8 and 15 you see they are connected. I would read this to mean that the input voltages are combined with the supply voltages. This seems unusual. Am I reading it right?

Where do I connect the actual audio inputs in this diagram? At the black dots above the pin 7 and below pin 8? Not super clear to me.

If I'm not planning on using the mute or standby can I leave that part of the circuit out?

The squiggly circle on the left of the diagram - what is it?

Thanks again.

 

[AlephZero]

Thanks jedi.

Next question is about connecting the signal inputs. If you look at pin 7 and 13 and 8 and 15 you see they are connected. I would read this to mean that the input voltages are combined with the supply voltages. This seems unusual. Am I reading it right?

No, pins 7 13 8 15 are all poiwer supply pins, not input pins.

The chip has separate pin connections to poiwer the initial amplifier stages and the output stage. For a simple application like Fig 1 they can both be connected to the same power supply. If you look at the "High efficiency " circuit in Fig 18, you will see that the two pairs of power connections are different.

Where do I connect the actual audio inputs in this diagram? At the black dots above the pin 7 and below pin 8? Not super clear to me.

The audio input is is the "squiggly circle" (i.e. an AC voltage source). The input then gets to pins 2 and 3 on the chip.

If I'm not planning on using the mute or standby can I leave that part of the circuit out?

If you look at Figs 16 and 17 it is reconmended to use these to eliminate any noises (i.e. thunps and bangs in the speakers) at switch on.

 

[alphy]

The different colored circles on a circuit diagram serve as symbols to represent different components or elements in the circuit. Each color may represent a specific type of component such as resistors, capacitors, or transistors, or it may indicate a specific function within the circuit. For example, in the circuit diagram provided, the full black circles may represent input or output pins, while the empty white circles may represent ground or power supply connections.

The use of different colored circles allows for easier identification and understanding of the circuit components, especially in more complex diagrams. It also helps to distinguish between different types of components and their functions. Additionally, the use of different colors can also aid in troubleshooting and circuit analysis, as it allows for quick identification of specific components.

In the specific circuit diagram provided, the black circles represent the pins on the integrated circuit (IC), which is a common way to indicate the connection points for the IC. The white circles, on the other hand, represent the ground and power supply connections for the IC. Therefore, in this case, there is a difference between the white and black circles, as they represent different elements within the circuit.

In conclusion, the significance of different colored circles on a circuit diagram is to clearly and effectively represent the various components and connections within the circuit, making it easier to understand and analyze.