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Reading the Tea Leaves a.k.a . Electronic Schemac Diagrams KARS - - PowerPoint PPT Presentation
Reading the Tea Leaves a.k.a . Electronic Schemac Diagrams KARS - - PowerPoint PPT Presentation
Reading the Tea Leaves a.k.a . Electronic Schemac Diagrams KARS Presentation Jack Philley WB5KVV What is a schemac ? Resistors Other Common Symbols Switches and Jacks Grounds Wiring Common Convenons / Pracces Not all
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Resistors
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Other Common Symbols
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Switches and Jacks
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Grounds
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Wiring
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Common Convenons / Pracces
- Not all ground wires shown
- Signal most oen starts at le side
- DC voltage source most oen starts at top
- IC pins – depicted by funcon, not by actual physical
locaon
- Sub-diagrams for
– secons such as built-in power supply – different / mulple operang modes when gang switches are used – Expanded view of complex or very crowed areas
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Simple CW transmier
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Receiver
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Some Challenges
- Inconsistencies – examples: USA vs rest of
world for resistors, wiring crossings, oddball symbols (example: buzzer device)
- Grounds – actual ground connecons not
always shown on schemac
- Disconnuies – sub-diagrams, goto X, from Y
- Physical connecons - plugs and sockets,
(phone jacks, coax, mike connecons)
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Addional Info
- ARRL Tech reference arcles from QST – Basics
for Beginners, First Steps in Radio, searchword schemacs
- SparkFun
- hps://learn.sparkfun.com/tutorials/how-to-
read-a-schemac
- Build Electronic Circuits -hps://www.build-