Basic soldering -- Voltage, current, resistance, and building a circuit on the breadboard -- The digital multimeter -- Series and parallel connections, ground -- Kirchhoff's laws, current convention, and Ohm's law -- AC voltage -- The resistor code -- Power and Watt's law -- Total resistance in series and parallel -- Voltage dividers, linear and audio potentiometers -- Capacitors -- Inductors and filters -- Diodes and leds -- Transistors and tubes -- Transformers and rectified AC -- Safety and test equipment -- Introduction to troubleshooting, and ESD precautions -- The TS audio cable -- The TRS balanced cable -- The XLR microphone cable -- The Piezo transducer.