This book is a valuable source of info for a wide range of HNC/D modules and provides an alternative to the core book. Well written and very readable
Signals and Systems
Fundamentals of Signals and Systems Using the Web and Matlab
Basic Digital Electronics
Digital Electronics
Analog Electronics: Circuits, Systems and Signal Processing
Analog Electronics, Devices, Circuits and Techniques
Analog Circuits (World Class Designs)
An Analog Electronics Companion: Basic Circuit Design for Engineers and Scientists
Analog Electronics, Second Edition
Electronic Test Instruments: Analog and Digital Measurements