Found in an American circuit manual from the 1970s, this circuit can use any general-purpose transistor. The operating frequency range is from 600 to 4000 Hz.
Using the Texas Instruments SN75489P this circuit was found in June 1978 Radio Electronics...
We found this circuit, which should only be used with incandescent lamps. In the Motorola Linear...
Found in Electronics Now from the 1980s, this amplifier can also be seen in commercial amplifiers...