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

    RF probes
    Regulated voltage divider
    800 To 1000Mhz Scanner Converter Circuit
    Ambient Power Module
    op amp square wave generator
    analog How to analyze this diode circuit
    PC Power Box with E fuse
    Video Clock and Message Generator
    TV cascades
    Pioneer CLD-1090
    Replacing old capacitors
    Transcranial magnetic stimulation



    Top