current amplifier

Discussion in 'General Electronics Chat' started by shiva bharadwaj, Nov 26, 2008.

  1. shiva bharadwaj

    Thread Starter Member

    Sep 29, 2008
    hi guys,
    whats the difference between a voltage and current amplifier?
    Say if voltage is amplified ,the current will get amplified right?
    I may be wrong please correct me.
  2. Wendy


    Mar 24, 2008
    There is a relationship, yes, but not fixed.

    A BJT transistor is a current amplifier. Its base emitter drops a relatively constant voltage (0.6VDC), but as you vary the current it amplifies that. The base emitter barely sees any voltage change at all.

    An op amp or a tube is just the opposite, it takes almost no current, but responds to voltage on it's inputs.