25 Watt amplifier


Posted on Dec 30, 2012

Transistors are used for current sources. Base drive for these transistors is derived from the main power supply VA, so that their collector current is proportional to the rail voltage. This feature holds the voltage on the cliff-amp collectors close to VA/2. The sensitivity of Iq to VA is about 3.4 mA/volt when VB is held constant; the sensitivity of Iq to VB is -15 mA/volt when VA is held constant. In a practical amplifier with a non-regulated supply, variations in power output will cause fluctuations in VA, but will not affect VB; therefore, having Iq increase slightly with power output will tend to compensate for the 3.4 mA/volt IqVa sensitivity.


25 Watt amplifier
Click here to download the full size of the above Circuit.

In the case of line voltage variations, since VA is about five times VB, the sensitivities tend to cancel, leaving a net sensitivity of about 2 mA/volt.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Church bell Controller with ATmega32
    Proportional-temperature-controller
    Simple Analog Multiplier Circuit Using LM107
    duracell cpu monitor
    Strobe Light Circuit with Timing PCB
    Simple Combination Lock
    touch free timer switch circuit
    F007 excellent performance of low-frequency signal generator circuit
    DC arc welding machine load path from one power outage



    Top