Audio Amplifier Projects

miniature power amplifier
There are quite a few applicationsof an audio power amplifierin which power and hi-ficharacteristics are of secondaryimportance. If, for instance, anactive loudspeaker for a portableradio receiver is needed, compactdimensions and low currentdrain are far more importantconsiderations.

HEXFET AMPLIFIER UPGRADE
The Medium Power HEXFET amplifierpublished in this magazine in December1993 has one small drawback: it delivers‘only’ 60 W into 8 � (or 120 W into4 ). Otherwise, it is a first class amplifierthat provides excellent music reproduction,which is evidenced not so much by measurementas by audition. To some listeners,it has a quality not […]

HEADPHONE AMPLIFIER
On much audio equipment, the headphone output is simplyderived from the loudspeaker output via a series resistor:not a very elegant design! The present circuit describes a‘real’ headphone amplifier that can be added to mostequipment, but may also be used as a stand-alone unit.

This realization prompted the presentcompact power amplifier whose quality and layout match those of thepreamplifier. It offers medium power output, is not overly complex andhas a very high slew rate.