This is the commercial circuit for the TRF-44 amplifier sold in Japan in the 1960s. The circuit provides a few hundred milliwatts and is intended to be used as small, battery-powered turntables.
This circuit appears elsewhere on the site. The circuit shown is from an American 1980s...
This circuit can produce signals up to 100 kHz depending on C1 and R1 adjustment. The output has a...
This circuit is from an old publication from 1977 and can be implemented with more modern...