Eduqas · QAN 603/0777/8 · Version 4, December 2025
A Level Electronics
Which lectures teach each point of this specification, and where.
SpecificationEduqasThe only A Level Electronics in England. In Wales WJEC offers the same specification (Qualifications Wales C00/1174/4). It covers more of this course than any other qualification: Lectures 1 to 6 and 9. Checked against the board's specification (Version 4, December 2025) on 28 October 2026. Each point is summarised in our words; its page number leads to the exact wording. This mapping is ours: no exam board has endorsed this site, and the lectures do not cover the whole specification.
| Spec point | What it asks for | Level | Taught in | Coverage |
|---|---|---|---|---|
| Component 2, topic 4 (c) page 33 (31) | the PCM link as a block diagram: the transmitter (low-pass filter, sampling gate and clock, ADC, PISO register) and the receiver (Schmitt trigger, SIPO register, DAC, low-pass filter) Lecture 1 explains and diagrams the transmitter; the receiver is only listed. | A level only | Lecture 1 The PCM transmitter The anti-aliasing filter Getting the wave back | partly covered |
| Component 2, topic 4 (d) page 33 (31) | the sampling frequency needed for a given highest signal frequency; the Nyquist theorem | A level only | Lecture 1 The sampling theorem Why a CD samples at 44.1 kHz | covered |
| Component 1, topic 4 (e) page 21 (19) | digitising audio; the effect of sampling rate and resolution Lecture 1 covers the sampling rate; resolution is Lecture 2. | A level only | Lecture 1 Why go digital? Sampling | partly covered |
| Component 1, topic 4 (f), (g); Appendix A page 21 (19); 49 (47) | factors affecting flash-ADC resolution; resolution = input voltage range / 2^n | A level only | Lecture 2 (coming) | covered |
| Component 1, topic 6 (f), (h), (i), (j) page 24-25 (22-23) | decibel power gain and attenuation; total gain of a chain; signal-to-noise ratio in decibels | A level only | Lecture 3 (coming) | covered |
| Core concepts, topic 4 (b); Component 1, topic 5 (b) page 14 (12); 22 (20) | rms values and AC power; rms and peak | AS (core) and A level only | Lecture 3 (coming) | covered |
| Component 1, topic 4 (a)-(d), (f), (h) page 21 (19) | the summing amplifier as a DAC; comparators and the flash ADC; digital ramp against flash | A level only | Lecture 4 (coming) | covered |
| Component 2, topic 4 (c), (e), (f) page 33 (31) | PCM transmitter and receiver; time-division multiplexing | A level only | Lecture 4 (coming) | covered |
| Component 1, topic 5 (c)-(e); topic 3 (k) page 22 (20); 20 (18) | reactance and impedance; RC low-pass and high-pass filters on linear-log and log-log graphs; bandwidth at 1/√2 of the maximum gain | A level only (5); AS (3k) | Lecture 5 (coming) | covered |
| Component 2, topic 8 (a), (d); Component 1, topic 5 (e), (f) page 37 (35); 22-23 (20-21) | first-order active tone controls; passive LC band-pass filters, resonant frequency and Q | A level only | Lecture 6 (coming) | covered |
| Component 2, topic 8 (a)-(c), (e)-(i) page 37-38 (35-36) | audio system structure; preamplifier and mixer; push-pull output stage and maximum power; crossover distortion and negative feedback | A level only | Lecture 9 (coming) | covered |