Developing an electronics outcome with complex techniques (internal)
Internal 6 credits Circuits Communication protocols Sensors Testing Safety Informed & refinedAS 91904, 6 credits — the joint-largest DigiTech internal. Achieved uses appropriate resources/techniques, CONSTRUCTS/TESTS/ANALYSES functional circuits, tests/modifies/debugs, EXPLAINS the outcome's BEHAVIOUR AND FUNCTION and its COMMUNICATION PROTOCOLS, and addresses implications. Merit develops an INFORMED outcome — using testing/analysis to ensure the circuit functions RELIABLY. Excellence develops a REFINED one — iterative improvement throughout, JUSTIFYING the protocols and the components/subsystems chosen.
1 Reading the notation
Six Achieved elements, then the informed/refined additions.📖 Terms the schedule grades you on
3 terms- Develop an electronics outcome (Achieved)
- Construct/test/analyse functional circuits; test/modify/debug; explain behaviour and function; explain communication protocols; address implications.
- Develop an informed outcome (Merit)
- Use testing/analysis information to ensure the circuit functions RELIABLY.
- Develop a refined outcome (Excellence)
- Iterative improvement throughout; justify the choice of communication protocols; justify the choice of components/subsystems.
2 The complex techniques the standard names
Integration and deliberate parameter choice, not a single component demo.The standard's own examples
- Communication protocols — I²C, serial communications.
- Wireless transfer of information.
- Feedback control.
- Software flags and interrupts.
- CAD design, 3D printing, CNC, PCB making.
- Filtering, noise and EMI suppression.
3 Safety and other implications
Safety is a genuine, physical implication here — not a formality. ✕The missing flyback diode
Switching a motor, relay or solenoid from a microcontroller pin without a flyback diode across the inductive load lets the collapsing field push a reverse voltage spike back into the circuit. It is the most commonly omitted protective component, and it destroys transistors and microcontrollers.4 Testing and documenting the circuit
Subsystems first, integrate second, document throughout so someone else could rebuild it.The sequence
- Write the end-user requirements as testable statements first.
- Breadboard and test each subsystem in isolation — sensor, then actuator, then logic.
- Add signal conditioning where the raw signal needs it, and say why.
- Integrate one subsystem at a time, testing after each addition.
- Test the failure modes deliberately: disconnect the sensor, interrupt the power.
- Document the circuit, the components with ratings, and the firmware.
Practice
Recall it first, then use it — testing yourself builds the memory, where rereading the notes above only feels easier.
Recall and application shuffled together — you have to work out what each item wants before you can answer it, which is the part the exam actually tests. Both kinds feed the same spacing schedule, so anything you miss comes back sooner.
Say the answer out loud before flipping — that attempt is where the learning happens, even when you get it wrong.
Exam-style only. Instant feedback, shuffled each attempt, best score saved on this device.