Given amplifier designed for a load of 32 ohms, (below is the schematic for higher loads >>a)

Headphone amplifier class A

Further , the circuit power supply :



and a modified scheme



This amplifier circuit can operate at 32 Ohm and 300 Ohm. For 32 Ohm switch SW1 is closed, and for 300 should switch to unlock .

 

 

 

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