If you have the skills and can get your hands on SMD components, you can assemble this small amplifier. We found it in the Radio Electronics Experimenter special edition from 1990.
This circuit is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit...
Although it uses a dual-channel FET, which is hard to find today, this circuit was released in a...
We found this circuit in the April 1979 Radio Electronics magazine. Note the filter capacitor bank...