This unit is designed to enable candidates to build on their knowledge of analogue electronic principles with regards to further understanding of electronic circuits. It will allow the candidate to gain an understanding of feedback and to develop this understanding with regards to a specified list of electronic amplifiers, filters and oscillator circuits. In addition, candidates will design a second-order filter using a reference table provided. The candidates will be required to perform practical tests on a circuit from the list. On completion of this unit the candidate should be able to: 1. analyse the effects of positive and negative feedback 2. analyse the circuits and properties of common operational amplifier circuits 3. outline the properties of filters 4. outline the operation of electronic oscillator circuits.