HA3-4741-5

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Linear–Amplifiers–Instrumentation, OP Amps, Buffer Amps

The HA3-4741-5 is a linear amplifier which belong to the instrumentation amplifier, OP amplifier, and buffer amplifier categories. Specifically, it is a high fidelity audio power amplifier built from the same design principles of the legendary audiophile designer, Nelson Pass. It is most suitable for driving speakers/headphones with low-impedance loads (4Ω/32Ω/47Ω).

HA3-4741-5 Working Principle

The HA3-4741-5 comprises of two main sections; input stage and output stage. The input stage is the most crucial and is comprised of a differential amplifier. This differential amplifier becomes the gain block of the amplifier and provides the voltage amplification between the input signal and output signal. The differential amplifier is composed of four matched Field-Effect transistors (FETs) configured in class-A. The signal provided by the differential amplifier is then fed to the output stage of the amplifier. This output stage is composed of two pairs of complementary power MOSFETs arranged in push-pull configuration. This arrangement provides efficient utilization of the audio power transistors, enabling better control on the output signals and hence, better performance.

HA3-4741-5 Application Field

The HA3-4741-5 is suitable for use in stereo systems or home theaters as a power amplifier and is also suitable for driving speaker loads requiring low impedance loads of 4Ω/32Ω/47Ω. It can be used in combination with when coupled with a pre-amplifier to provide a highly capable bi-amplification system. It is also suitable for audio applications such as car audio systems, professional audio systems, etc. Its small size and high power output makes it an excellent choice for applications where space/power is at a premium or in harsh environments (due to its robust design).

Conclusion

The HA3-4741-5 is an amplifier belonging to the instrumentation amplifier, OP amplifier, and buffer amplifier categories. It is most suitable for driving speakers/headphones with low-impedance loads (4Ω/32Ω/47Ω). It comprises of two main sections; input stage and output stage. The input stage is the most crucial and is comprised of a differential amplifier. The differential amplifier is composed of four matched FETs configured in class-A and the output stage is composed of two pairs of complementary power MOSFETs arranged in push-pull configuration. It is suitable for use in stereo systems or home theaters as a power amplifier, when coupled with a pre-amplifier to provide a highly capable bi-amplification system or even in car or professional audio systems due to its small size and high power output.

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