Amplifier Circuit using MOSFET Output Stage

Published:2013/3/13 1:07:00 Author:Ecco | Keyword: Amplifier, MOSFET Output Stage | From:SeekIC

The circuit presented here is amplifier circuit using MOSFET output stages, as a substitute for the output stage based on bipolar transistors. This project is for those who want to experiment with the power MOSFET. Without going into details, the MOSFET has a characteristic sound of vacuum tubes and bipolar transistors. The main advantages MOSFET Amplifier : simplicity of operation, hundreds of watts with a simple parallel, negative temperature coefficient and fast switching times. The main disadvantages : a high input capacity from 500 to 1000 pF, sensitivity to electrostatic discharge. MOSFETs are available in a very wide range in the PNP and NPN, the voltage from 100 to 200 volts or more, additional models (such as bipolar). Model commonly used in power amplifiers are 10N16, 10P16, IRFP140, IRFP9140, IRFP240, IRFP9240, 2SK135, 2SJ50, 2SK1530, 2SJ201. In this project, points A and C are connected to the output of the driver stage, point B is to counter-reaction and the point D the mass driver. Board is planned for the case TO3P transistors, it will slightly bend the foot for TO220-type packages.



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