113 Watts at 8Ω Op-amp input MOSFET Power Amplifier Project скачать в хорошем качестве

113 Watts at 8Ω Op-amp input MOSFET Power Amplifier Project

Project 62 utilizes an op-amp in the front-end input stage with ZTX753/ZTX653 BJT drivers coupled to the paralleled-complementary IRF640/IRF9640 power MOSFETs. Project 62 is based on an article written by Reinhard Metz, published in the April 1992 issue of Radio Electronics magazine, who kindly gave permission to use his article as a reference. Even though the project is more than 30 years old, the output stage is a remarkable and innovative design that deserves attention. The power output of the amplifier is about 113 watts at 8 Ω with ±45 VDC power supply rails. The power output rating was acquired by measuring the voltage across the 8Ω dummy load when a 1KHz 0.495Vrms sine wave signal is applied to the input of the amplifier. An 8-pin IC socket was intentionally populated in the prototype so that other types of op-amps (OPA604, TLE2071, TL071, and TL081) could be evaluated. Overall, granting that the audio power amplifier design was developed more than 30 years ago to date, the revisited project did not disappoint but rather resulted in an exciting build after all!