Snelgrove, Martin Department of Electronics, Carleton University, Ontario, Canada.
Last reviewed:January 2020
- Biasing for classes A and B
- Transformer-coupled amplifier
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An electronic circuit in which two transistors (or vacuum tubes) are used, one as a source of current and one as a sink, to amplify a signal. One device “pushes” current out into the load, while the other “pulls” current from it when necessary. A common example is the complementary-symmetry push-pull output stage widely used to drive loudspeakers (Fig. 1), where an npn transistor can source (push) current from a positive power supply into the load, or a pnp transistor can sink (pull) it into the negative power supply. The circuit functions as an amplifier in that the current levels at the output are larger than those at the input. See also: Transistor
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