Unit: 3
ENGINEERING TECHNOLOGY MQF LEVEL 1
Learning Outcome: Electronics circuits designs
Subject Focus1. Interpret the different represenations of Circuits
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Different electronic components:
- Passive components: Resistor; capacitor;
- Semiconductors: e.g. Diodes, LEDs, transistors;
- Sensors: e.g. Light dependent resistor LDR, thermistor, microphone;
- Actuators: e.g. D.C. motors, relays, buzzer;
- Integrated circuits: NE555; voltage regulators;
- Sources: e.g. Batteries, power supplies, solar cells;
- Switches: e.g. SPST, SPDT, DPDT;
- Connectors: IC base; screw-type and spring-type PCB connectors.
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- Sub-circuits: Potential divider; timing circuits;
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- Basic laws of electricity: V=IR; P=IV; Resistors and capacitors in parallel and series; T=RC.
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- Individual components: e.g. resistor, LDR, capacitor, diode, transistor, relay, motor, battery, solar cell, SPDT.
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- Information: component list; values; quantities.
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- One of the following circuits: Potential divider, timing circuits.
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- One of the following circuits: Amplifiers, Timers or Oscillators, Filters, Sensing circuits, Actuating circuits, Audio or Visual indicator circuits.
Subject Focus 2. Test and find faults in circuits.
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- Tools and equipment: soldering iron; wire stripper; side cutter; long nose pliers; third hand; de-soldering pump; solder wick; track cutter.
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- Testing Equipment: Digital multi-meter, with and without auto-ranging.
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- Testing Equipment: Digital multi-meter, with and without auto-ranging.
- Scenarios: Finding the voltage of a battery; finding the current in a simple circuit; finding the resistance of resistors in parallel and series; checking the continuity of tracks and wires.
- Procedures: isolate components; selecting the right setting; interpret value correctly; record the result
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- Faults: Missing components; misplaced components,; incorrect components; missing jumpers; misoriented components.
Subject Focus 3. Assemble electronic circuits safely and correctly.
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- Electronic boards: Breadboard; strip board; PCB.
- Parts: bus lines; terminal strips; copper tracks; insulation layer; photo resist layer.
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- Process: Drawing of the artwork (with or without software); chemical development of PCB; etching of a PCB; populating the PCB.
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- Soldering processes for prototypes: cleaning of soldering iron tip and board; preparation of surfaces to be soldered by tinning; applying solder; finishing
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- Electronic boards: Breadboard; strip board; PCB.
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- Scenarios: Prototype; One-Off; Mass production.
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- Assemble: safe handling of tools; using the appropriate PPEs and procedures; quality of soldering technique; soldering components in appropriate position; soldering component in the right orientation.