1. Draw and label the block diagram of an oscillator.
2. State two conditions for oscillation to occur.
3. State two advantages of negative feedback in an amplifier.

          The expected answers were:
          (a)                        
                                                     

                                   
                                              
(b)        Conditions for oscillation to occur
            (i)         The gain must be greater than 1.
              (ii)      The feedback signal must be in phase with the input signal
                                                            OR
            (i)         | Aβ | > 1
            (ii)         =  
                                                                                     
(c)        Advantages of negative feedback
            (i)         Circuit stability
            (ii)        Reduction in distortion
            (iii)       Increase in bandwidth
            (iv)       Reduction in noise
            (v)        Gain stability
            (vi)       Causes changes in the values of input/output impedance