Trouble in a Balance Modulator

Discussion in 'Homework Help' started by eranda, Jan 17, 2013.

  1. eranda

    Thread Starter New Member

    Jan 8, 2013
    I'm having a trouble with explaining the action of the circuit shown in figure.
    According to the figure
    1.L1 gets the input MODULATING SIGNAL.
    2.L2 & R1 gets the CARRIER SIGNAL.
    3.MODULATED OUTPUT is taken from the L3.

    In this the CARRIER AMPLITUDE is greater than the AMPLITUDE of the MODULATING SIGNAL.

    Action of the circuit:-

    1)MODULATING SIGNAL comes in as the input to L1 and L1 keeps it as a stable wave due to the induction. Then it is produced to the L2.
    2)While L2 is producing the MODULATING SIGNAL, CARRIER SIGNAL also applied to the L2 by tapping.
    3)R1(variable resistor) is controlling the CARRIER WAVE according to the Input MODULATING SIGNAL.
    4)D1 allows to pass only the positive half cycle of the wave, while D2 allows the Negative half cycles.
    5)L3 & L4 provides MODULATED positive and negative outputs respectively.
    6)L5 makes it more stable and provides the required output.

    Am I missing something in explaining the action of the circuit?? Still I don't understand why it was given as CARRIER AMPLITUDE is greater than MODULATING AMPLITUDE.