Electronics Technician
Measure, test components, build and repair power supplies and control circuits, and find faults methodically.
Hands-on measuring, component testing, power supplies and fault-finding.
Before you start: Electronics Fundamentals, or equivalent bench experience
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Module 1: Measuring and safety
- Using a multimeter
- Ohm’s law
- Power and power ratings
- Fuses and fault current
- Continuity and short-finding
Extra practice:
- Battery internal resistance
- Kirchhoff’s voltage law
- Kirchhoff’s current law
- Using an oscilloscope
- Oscilloscope: comparing two signals
- Light with one switch
- Outlet circuit: three outlets on a 20 A breaker
- RCD protection: someone touches a live wire
Module 2: Components and testing
- Diode forward and reverse bias
- LED and its series resistor
- Zener shunt regulator
- BJT current gain (β)
- Capacitors in series and parallel
- Reading colour codes and markings
- Testing diodes and transistors with a meter
- Capacitor ESR check
Extra practice:
Module 3: Power supplies
- Basic transformer
- Half-wave rectifier
- Bridge rectifier and filter
- 12 V → 5 V regulators
- LM317 adjustable regulator
- Fault-finding a linear supply
- Fault-finding a switch-mode output
Extra practice:
- Linear supply: transformer, bridge, capacitor, regulator
- Series-pass regulator (transistor + Zener)
- Split supply: ± rails for op-amps
- SCR crowbar over-voltage protection
- LDO vs buck: choosing a 3.3 V rail
- Inrush limiting with an NTC
- Reverse-polarity protection with a P-MOSFET
- Adjustable bench supply 1.25–20 V
Module 4: Transistor circuits
- Transistor as a switch
- MOSFET low-side switch
- Inductive load and the flyback diode
- Emitter follower (buffer)
Extra practice:
- Darlington pair
- H-bridge motor driver
- Light-activated switch with relay
- Thermal flasher and relay latch (start/stop)
- TRIAC light dimmer with DIAC
- LED constant-current driver
- H-bridge: PWM speed, direction and braking
- Continuity tester
- Motion-activated light
- PWM fan or LED dimmer
Module 5: Op-amps and timers
- Inverting amplifier
- Non-inverting amplifier
- Comparator with a light sensor
- 555 astable (LED flasher)
- 555 monostable (one-shot timer)
Extra practice:
- Schmitt trigger
- LM386 speaker amplifier
- UJT relaxation oscillator
- 555 delay-off timer with relay
- LM386 speaker amplifier box
- 12 V low-voltage battery cutoff
Module 6: Batteries, chargers and USB
- Cells in series and parallel (LiFePO4)
- USB cable voltage drop
- USB-C charging: the power path
- Charging a phone from 12 V with an HW-688
Extra practice:
- Phone charging: volts, amps and watts
- USB-C attach detection (CC, Rp and Rd)
- USB Power Delivery: asking for 20 V
- Li-ion CC/CV charger from an LM317
- Cell protection: DW01 + 8205A
- TVS, polyfuse and protection front end
- Single 18650 charger with LED charge indicator
- 18650 battery level indicator
- USB power bank
- Automatic emergency light
- 10,000 mAh power bank · 4 × 18650
- 20,000 mAh power bank · 4 × 21700
- 24,000 mAh LiFePO4 power bank · 4 × 32700
- 100 Ah 12 V LiFePO4 battery (4S17P, 32700 cells) with charger
Module 7: Digital and logic levels
Extra practice: