This sensitive circuit was found in an Electronics Hobbyists Handbook from the 1990s. The circuit can use common general-purpose transistors in place of the original ones.
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...