Electronics study guides

An overview of the applications of diodes content in Component 1 of WJEC Eduqas GCSE Electronics, covering the silicon diode's one-way behaviour, reverse-polarity and inductive-spike protection, half-wave rectification of AC to DC, and the Zener diode used with a series resistor for voltage regulation.

An overview of the circuit concepts content in Component 1 of WJEC Eduqas GCSE Electronics, covering charge, current and voltage, resistance and Ohm's law, the I-V characteristics of a resistor, lamp and diode, the power and energy equations, the series and parallel rules, circuit symbols and test equipment.

An overview of the combinational logic content in Component 1 of WJEC Eduqas GCSE Electronics, covering logic levels, the NOT, AND, OR, NAND, NOR and XOR gates, truth tables, Boolean expressions and identities, simplification, NAND universality, and designing a logic system using a data sheet.

A concise overview of Component 3 of WJEC Eduqas GCSE Electronics, the non-exam assessment (extended system design and realisation task), covering the design stages from analysing a problem to evaluating the finished system, and how it applies the knowledge from Components 1 and 2.

An overview of the electronic systems and sub-systems content in Component 1 of WJEC Eduqas GCSE Electronics, covering the input, process and output sub-systems, system block diagrams, sensors, processing units, output devices and transducer drivers, and how the systems approach is examined.

An overview of the interfacing and control content in Component 2 of WJEC Eduqas GCSE Electronics, covering the Schmitt inverter and hysteresis for debouncing and cleaning signals, comparing transistor, comparator and Schmitt interfaces, and the microcontroller as a programmable IC with flowchart control programs.

An overview of the operational amplifiers content in Component 2 of WJEC Eduqas GCSE Electronics, covering amplification and voltage gain, the gain-frequency response and bandwidth, clipping, the inverting and non-inverting amplifier gain equations, the summing amplifier (mixer), and the amplifier system block diagram.

An overview of the resistive components content in Component 1 of WJEC Eduqas GCSE Electronics, covering combining resistors in series and parallel, resistor codes and the E24 series, potential dividers, the LDR and thermistor as input sensors, pull-up and pull-down resistors and current-limiting an LED.

An overview of the sequential systems content in Component 2 of WJEC Eduqas GCSE Electronics, covering the rising-edge-triggered D-type flip-flop, building 1-bit and 2-bit binary counters, frequency division, BCD and decade counters, seven-segment displays with a decoder/driver, the 4017 sequencer, and resetting for a custom count length.

An overview of the switching circuits content in Component 1 of WJEC Eduqas GCSE Electronics, covering the npn transistor and n-channel MOSFET as switches, the voltage comparator as an IC switching circuit, setting a threshold with a potential divider, and interfacing an output with a transistor or relay.

An overview of the timing circuits content in Component 2 of WJEC Eduqas GCSE Electronics, covering RC charging and discharging and time delays, the 555 monostable (single pulse, T = 1.1RC) and the 555 astable (continuous square wave, frequency and mark-space ratio).