ABSTRACT
The most popular dual opamp in the world of audio is the (NE) 5532. The type (NE) 5532 dual operational amplifier (opamp) is a very capable device giving low distortion with good load-driving capabilities, and a remarkably good noise performance. The design shows one channel of the complete amplifier. It consists of unbalanced and balanced line inputs, and the power amplifier itself, which is divided into a +22.7 dB gain stage and an array of paralleled output opamps configured as voltage-followers. This gives the maximum amount of negative feedback around them to minimise distortion. The power amplifier consists of thirty-two 5532 dual opamps working as voltage-followers, with their outputs joined by 1 Ω current-sharing resistors. The output mute relay RE1 protects the loudspeakers against a DC offset fault and gives a slow-on, fast-off action so no transients are passed to the loudspeakers at power-up or power-down.
