Here the schematic diagram of headphone amplifier which built based single MOSFET as the main amplification component. This circuit is quite simple and easy to built with minimum cost.
Circuit notes:
The amplifier concept is simple and follows a typical single-ended class A circuit utilizing an active constant current source (CCS) in place of a passive resistor. A CCS doubles the efficiency of the circuit over that where a passive load resistor is used, bringing it to a maximum of 25%.
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