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Figure 2: A negative-feedback amplifier. The circuit can be explained by viewing the transistor as being under the control of negative feedback.From this viewpoint, a common-collector stage (Fig. 1) is an amplifier with full series negative feedback.
Sixteen ohm drivers (or loudspeakers systems) would be connected to the 16-ohm tap, 8 ohm to the 8 ohm tap, etc. This is significant since the ratio between the loudspeaker impedance and the amplifier's impedance at a particular frequency provides damping (i.e., energy absorption) for the back EMF generated by a driver.
In absolute terms, the manufacturer of the LH002 specified open-loop THD of 0.1% at 5 V RMS output into a 50 Ohm load at ±12 V supply voltage (class AB). Designers of class AB zero-feedback hybrid audio power amplifiers employing the unmodified four-transistor output stage claimed THD of 0.1% at 3 kHz and 0.25% at 20 kHz. [ 18 ]
[2] For an NPN open emitter output, the collector is connected to the positive voltage rail, so the emitter outputs a high voltage when the transistor is on and is hi-Z when off. For a PNP open emitter output, the collector is connected to the low voltage supply, so the emitter outputs a low voltage when the transistor is on and is hi-Z when off.
This can be calculated from the Z L of the loudspeaker (typically 2, 4, or 8 ohms) and the given value of the damping factor. Generally in audio and hifi , the input impedance of components is several times (technically, more than 10) the output impedance of the device connected to them.
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