I would like to know the difference between different types of Grounds like Power-GND vs Pre-GND. Are all the grounds not same? Cant we connect the device to any one of these grounds?
In my application I have a low frequency audio amplifier called "TA8229K" which has 15 pins.
On this picture, on this diagram there is written that only 3 ,5 and 7 pins might be connected to Power-GND.
1) At first which one is the Power-GND? Is it a negative direction of 9v battery?
I think that 4 and 8 Pins might be connected to positive direction of 9v battery (Where is written VCC).
Am I right?
Also There is written that 14 and 15 pins might be connected to Pre-GND1 and Pre-GND2.
2) which one is the Pre-GND1 and Pre-GND2? Is it a negative direction coming from low frequency audio device?
Also there are other pins like 9, 10, 13 which are connected to some kind of GND on diagram, but there is no written which one is!
3) Where should I connect those 9, 10, 13 pins?
4) Where should I connect first pin (1 pin)? What does it mean N.C. ?