600+ watts 4Ω│300+ watts 8Ω CFA-based quasi-complementary MOSFET power output stage.
Автор: BuildAudioAmps
Загружено: 2023-08-09
Просмотров: 1698
Описание:
Project 54 is a CFA-based input stage with a quasi-complementary output stage audio power amplifier. It employs an all N-channel UniFET MOSFETs that eliminates the need for finding a suitable matching complementary pair. The measured power output is 306.28 watts into an 8Ω load or even higher at 612.56 watts when connected to low impedance 4Ω loads. The prototype requires a ±80VDC power supply rails.
The input stage of Project 54 is similar to those used by previous CFA-based audio power amplifier projects. The CFA-based input stage, in my opinion, produces better audio performance and quality when compared to the front-end input stage of a mirror-image topology.
Another feature of this project is the addition of an NTC thermistor in the VBE multiplier circuit. This technique offers better thermal stability when compared to other typical methods.
Listening to several CDs, the audio quality is pleasant and impressive. It delivers clear and powerful bass, despite using a quasi-complementary design and not having a Baxandall diode. When the input signal is increased above the normal level, the amplifier shows its true potential!
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