This circuit is from a 1990 publication but can still be assembled today with some component changes. For example, Q1 and Q3 can be BC558., Q2 can be BC548. Q4 is a BD135 and Q5 is a BD136. The power source current must be in the order of 500 mA. The output consists of headphones with 8 to 600-ohm of impedance.
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