Hello!
https://images.app.goo.gl/Z2ubMvpESb9A7Aiq8
A standard laptop charger can be used for power supply, where the output power is 5 watts and the distortion is < 1% (2nd and 3rd harmonics). In principle, the supply voltage can be increased up to 30V (Pout ~ 10 watts). The efficiency of this amplifier is about 20%.
The adjustment important if you really want full output power. With R15* you set the voltage at the collectors of T4, T5 and T6 to Vcc/2 (e.g., +19V/2 = +9.5V). Use R13* and R14* to adjust the currents through T6 and T5 (for Vcc = +19V it should be 0.6A each).
The circuit has an automatic soft start. If R15* is too large, it can take up to 0.5 minutes, until the amplifier becomes active.
Best regards
https://images.app.goo.gl/Z2ubMvpESb9A7Aiq8
A standard laptop charger can be used for power supply, where the output power is 5 watts and the distortion is < 1% (2nd and 3rd harmonics). In principle, the supply voltage can be increased up to 30V (Pout ~ 10 watts). The efficiency of this amplifier is about 20%.
The adjustment important if you really want full output power. With R15* you set the voltage at the collectors of T4, T5 and T6 to Vcc/2 (e.g., +19V/2 = +9.5V). Use R13* and R14* to adjust the currents through T6 and T5 (for Vcc = +19V it should be 0.6A each).
The circuit has an automatic soft start. If R15* is too large, it can take up to 0.5 minutes, until the amplifier becomes active.
Best regards