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Learn about connectors, conductors, voltage sources, protection devices, input and output devices, and schematic diagram drafting guidelines for electronic circuits. Explore symbols, values, ratings, lead styles, and construction steps.
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Component Symbols&Information Prof. Dr. Moustafa M. Mohamed Vice Dean, Faculty of Allied Medical Science, Pharos University in Alexandria
Connectors • Connectors – Termination devices for wires or cables. • Plug = Probe = Male Contact. • Jack = Receptacle = Female Contact.
Connectors (cont.)Types • 1/8” or ¼” DIN/guitar style • RCA or phono style • Terminal Block • PC Board Edge Card • Banana Style • Power/wall plug style
Generic Plug 1/8” – ¼” DIN plug RCA/Phono Plug Generic Jack 1/8”-1/4” DIN Jack RCA/Phono Jack Connectors (cont.)Graphic Symbols
Connectors (cont.)Lead Styles • Wire Lead • Eyelet • PC-Mount
Connectors (cont.)Values/Ratings • Amperage • Voltage • Insulation/breakdown factors • Reference Designation: • Jacks = J • Plugs/probes = P
Conductors and Cables • Conductors and Cables - Used to make connections
Conductors and Cables (Cont)Types • Hookup Wire – Solid, stranded • Coaxial Cable – Shielded, unshielded • Twisted Pair – Shielded, unshielded • Multiconductor Cables – Round, flat, shielded, unshielded
Conductors and Cables (Cont.)Value/Ratings • Amperage • Voltage • Insulation/Breakdown properties • Reference Designation = W
Voltage Sources • Direct Current (DC) • Types • Battery • Single-cell • Multi-cell • Values/Ratings • Voltage • Ampacity • Amps/hour • CCA
Voltage Sources (Cont) • Alternating Current (AC) • Types • Generator • Transformer • Values/Ratings • Voltage • Amperage • Reference Designation: • E or V • I
Protection Devices • Protection Devices – Used to protect circuits from excess current flow
Protection Devices (Cont.)Types • Fuses • Slow Blow • Fast Blow • Circuit Breakers • Slow or fast blow • Manual • Thermal • Magnetic
Protection Devices (Cont.)Lead Styles • Wire • Eyelet • Cartridge Ends • Cartridge Tabs
Protection Devices (Cont.)Values/Ratings • Current Limits • Voltage Applications • Reference Designation: • Fuses = F • Circuit Breakers = CB
Protection Devices (Cont.)Graphic Symbols • Fuse • Circuit Breaker
Input Devices • Input Devices – Used to input a signal to a circuit
Input Devices (Cont.)Types • Antennas • Microphones • Sensors • Connectors
Input Devices (Cont.)Lead Styles • Wire • Eyelet • PC-Mount • Surface Mount • Cartridge Ends
Input Devices (Cont.)Values/Ratings • Resistance/Impedance • Frequency • Voltage • Current • Sensitivity • Reference Designation: • Antenna = E • Microphone = MK
Input Devices (Cont.)Graphic Symbols • Antennas • Microphone
Output Devices • Output Devices – Used to display or produce circuit output signals
Output Devices (cont.)Types • Displays • CRT • LED • LCD • Drivers • Tape Heads • Loud Speakers • Piezoelectric cells • Buzzers • Bells
Output Devices (Cont.)Values/Ratings • Resolution • Brightness • Wattage • Decibels • Frequency • Reference Designation: • Displays: CRT, LED, LCD • Drivers: LS, DS
Output Devices (Cont.)Graphic Symbols • Cathode Ray Tube • Loud Speaker
Ground Connections • Ground Connections – Used for common circuit return connections.
Ground Connections (Cont)Types • Earth • Chassis • Common
Schematic Diagram Drafting Guidelines (Cont.)Suggested Steps (Cont.) • Review/Revise the rough draft • Signal flow • Components: • Symbols • Polarities • Values • Connections • Notes • Create Final Draft
Drafting Suggestions • Allow for balance, and spacing considerations when placing individual components. • Allow space for reference designations when placing individual components.
Schematic Diagram Construction Steps • Layout inputs on left, and outputs on right. Sketch main components (Transistors, I.C.’s), then • Sketch support components (Resistors, capacitors), and finally • Sketch coupling components (Capacitors, diodes) • Sketch supply connections and input/output connections. • Sketch horizontal and vertical interconnection lines. • Use minimal bends/dog legs. • Use minimal crossovers. • Use uniform spacing.
Schematic Diagram Construction Steps (Cont.) • Sketch reference designations (required) • Use standard reference designations. • Label to the right or above component. • Sketch Component values (optional) • Nominal rating • Tolerance • Power rating • Review, revise, finalize