This book is an up-to-date text on electronic circuit design for people who like to learn electronics by building circuits and making measurements. The subject is dealt with from an experimental point of view, but this has not restricted the author to well-known or simple circuits. Indeed, some very recent and quite advanced circuit ideas are put forward. Each chapter takes up a particular type of circuit, and then leads the reader to gain an understanding of how these circuits work by proposing experimental circuits for the reader to build and measure. Examples discussed include step recovery circuits of the digitizing oscilloscope, sampling gate and fast comparator circuits, probe and input circuits, wide-band amplifier and waveform-generating circuits, and switched capacitor, phase locked loop, and low noise circuits.