This precision speed control was obtained in an Electronic Design from the 90's. The output final stage power transistors must be in accordance with the motor power.
This amplifier with a few watts of power was found in a Japanese technical documentation from the...
This high impedance headphone amplifier was found in American documentation from the 1990s. Any...
This small audio amplifier was found in the May 1994 issue of Electronics Now magazine. The power...