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Which of the following must NOT be considered while drawing a schematic diagram?
1. Branched circuits of equal importance should be drawn similar to one another.
2. Switches, push buttons and contacts should be drawn in actuated position.
3. The supply lines should be drawn horizontally while the different circuit connections should be drawn vertically.
4. Switches, push buttons and contacts should be drawn in such a way that their movement is from left to right.

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Correct Answer - Option 2 : Switches, push buttons and contacts should be drawn in actuated position.

Concept:

Schematic diagram:

  • A  schematic diagram is a fundamental two-dimensional circuit representation showing the functionality and connectivity between different electrical components.
  • It is vital for a PCB designer to get familiarized with the schematic symbols that represent the components on a schematic diagram.

 

The following points should be considered while drawing schematic diagram:

Name:

  • Use manufacturer's part name (some exceptions to this rule, such as for common symbols such as passives where the generic name is used, like resistors, capacitors.)

Pin Configuration:

  • Inputs on left
  • Outputs on right
  • VCC & power pins are placed on the upper right for ICs
  • GND pins on the lower right for ICs
  • I/O pins on the middle-left (occasionally middle-right too if there are many)
  • Control pins at the upper left
  • Use one symbol pin per function even if it maps to various package pins
  • Pin type must reflect input type (Ex. io, in, out, pas etc.). for proper ERC/DRC checks

 

Special Pins:

  • No Connect pins must be named as NC on the symbol
  • Active-low pins should be designated with a bar above the symbol name
  • Clock pins designated with a triangle

  

 Additional data: 

  • Add MPN(manufacturing part number) above symbol
  • Add reference designator and value placeholder below symbol
  • Reference designator prefix should be as per component eg. R for resistor, J-jumper, L-inductor etc.

 

Physical and electrical Rules:

  • Always add block diagram of the circuit so as to get the quick view of the various interfaces(most important)
  • Add title block which includes organization name, page size, date, sheet number,version, title of the schematic name etc.
  • Use A4 size sheets.
  • Keep the grid spacing at least 2mm so that while creating pdf of schematic you can easily see the signal name.
  • There should be no identical part reference.
  • Make sure you are always using right reference designator for the symbols eg. R-resistor,C-capacitor etc.
  • Every pin must be connected to a net if there is NC pin add no connect property to it so that no DRC error pop-up while generating DRC report.
  • If there is any heterogeneous symbol make sure every part of the symbol has to added on the schematic sheet .
  • Minimum font size should be 12 (I prefer while drawing schematic, don't know about industry standards regarding this.)
  • Every symbol have a footprint attach to it.
  • Make sure pin-type is correct. Add power pin type to the pin to which power signal has to be connected
  • No duplicate net name.
  • The movement of switches, push buttons and contacts should be from left to right.
  • Add Power and Voltage rating to each resistor used in the schematic.
  • Off-page connector used to connect the signal on two or more pages must have same net name.
  • If there is any critical net/high speed signal like address or data signal of DDR,PCIe, HDMI,USB, or any high speed interface always mention the routing guideline/precautions while routing the signals.

 

Explanation:

Switches, push buttons and contacts should be drawn in actuated position must NOT be considered while drawing a schematic diagram.

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