Electronic – building the own lc meter – multi point gnd


I'm building my own lc meter using the attached schematic. What I don't understand is why there is more than one path to gnd? Does it not eventually get connected to the same point?

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Best Answer

There is only one connection to GND, either on the negative side of the battery or I am guessing through the power supply pins on the bottom of P2A. Electrons will flow from every chip back to that one GND connection through its own unique path. There is nothing explicit on the schematic about how to connect the various GND triangles (this is done in layout), but the layout will have huge implications for how well the circuit functions.

Since this is a mixed analog/digital board, the biggest source of noise to eliminate is the digital noise polluting the analog return path.