Push=pull power amplifier - has negative feedback transistor between input and output transistors to accommodate low voltage supply and small load

摘要

The pushpull power amplifier has adequate negative voltage feedback even with low voltage supplies and low-ohmic loads. A second transistor is coupled in parallel with each output transistor. The negative feedback signal passes from this second transistor to the input transistor via a resistor. Both second transistors have collector resistors greater than the load resistance. The two pushpull halves of the amplifier are driven by the output of a phase inverter. The load is connected between the collectors of the two output transistors and has a tapping connected to one supply pole.