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BY Design by T. Giesberts


On much audio equipment, the headphone output is simply derived 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 most equipment, but may also be used as a standal one unit.








The performance of the Philips chip is typified by the distortion characteristic in Fig. 3. This shows that the THD+N is, as claimed, low: with a 1 kHz input signal at a level of 1 V and an output load of 600 Ω, the measured value was about 0.0015%. With a load of 32 Ω worse channel separation, but this can not really be attributed to the amplifier. The maximum output voltage is 2 V r.m.s. across 560 Ω

Fig. 3. The THD+N characteristic for 1 V input and a load of 600 Ω.