Self on Audio, 3rd Edition

Chapter 44The 5532 OpAmplifier

Part 2: construction, bridged operation and test results (Elektor, November 2010)

The second part of the article covers the practical details of construction, and some rather pleasing test measurements. The issues of driving 4Ω loudspeakers and bridging are also discussed. This design approach is not very well suited to low-impedance loudspeakers. The only way to double the output current capability is to double the number of opamps, which naturally doubles the cost. For a 4Ω loudspeaker, there will now be 128 opamps (64 dual packages) per channel. This is catered for in this design simply by using two amplifier PCBs with their outputs connected together. Because of all those 1Ω current-sharing resistors, this ...