Free EASA Module 4 Exam Prep

Diode symbols and characteristics, forward/reverse bias, half-wave, full-wave and bridge rectifiers, smoothing, clippers and clampers, Zener regulation, LED, thyristor (SCR), Schottky, photo, varactor and varistor

PNP/NPN construction and currents, N-type and P-type doping, common-emitter/base/collector configurations, bias and stabilisation, decoupling, feedback, amplifier classes A/B/C, push-pull, oscillators and multivibrators, FETs and Darlington pairs

Analogue op-amps (inverting, non-inverting, voltage follower, comparator, integrator, differentiator, summing), virtual earth, open-loop gain and slew rate, and digital logic gates (AND, OR, NOT, NAND, NOR, XOR) and TTL levels

PCB function and construction, copper-clad laminate and etching, plated-through holes (vias) on multilayer boards, surface-mount versus through-hole components, and ESD handling precautions for MOS/CMOS devices

Open and closed loop control, feedback and follow-up, error and null-seeking action, deadband, damping and velocity (rate) feedback, hunting, and analogue transducers including potentiometers and LVDTs

Torque transmitters (CX) and receivers, control transformers (CT) and the 90-degree null, differential synchros (CDX), resolvers and sine/cosine outputs, E and I transformers, capacitance transmitters, 400 Hz excitation, lead reversal and synchro defects