Circuit schematic drawings are symbolic representations of electric circuits that can be drafted on paper or in digital form (using a PCB design software such as EasyEDA). A circuit schematic shows the various components
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Circuit schematic drawings are symbolic representations of electric circuits that can be drafted on paper or in digital form (using a PCB design software such as EasyEDA). A circuit schematic shows the various components (using standard electronic symbols) and their interconnections. These designs are conventionally organized from left to right of a page.
To design a circuit schematic using PCB software, you may start with a basic circuit template. From a panel within the application (which may be labeled “symbols” or “tools”), you can choose from a variety of electronic components such as capacitors, inductors, resistors and more. Pick and place components at various points of the circuit as required, and link them using connecting lines. You can also increase the complexity of your circuits by creating additional layers using PCB floor plans. The node voltage method (aka nodal analysis) uses Kirchhoff’s current law and Ohm’s law to determine voltages between nodes (points in a circuit where two or more elements connect).
According to Ohm’s law, the value of current flowing through any two points in an electronic circuit is directly proportional to the potential difference (aka EMF) between the two points. Mathematically, this is expressed as V = I/R (where v is the voltage in volts, I is the current in amperes, and R is resistance in Ohms).
Kirchhoff’s current law (KCL) states that the current flowing into a node and out of a node at any given time is equivalent. Mathematically, this is expressed as IOUT = IIN or - IOUT + IIN = 0.
The basic steps involved in Nodal analysis include:
Selecting a reference (or ground) node and defining its value as 0V
Using notations such as nodes a, b, c, etc. to define all other nodal voltages
Using KCL to find the nodal voltages around the circuit
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