General Block Diagram Comments
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System requirements should be listed before drawing block diagrams.
System diagrams used in viewgraphs should have at least
four blocks (preferrably five or six).
Names for each block function should be included inside the block
(or adjacent to it).
Signal / power flow should be indicated by arrow heads.
Input / output interfaces (level, impedance, frequency range, etc.)
should be defined if important.
Note--Complex systems may require hundreds of blocks.