Found in a 1964 Electronic Design, this circuit makes use of period components. The components are from the time, and modern equivalents can be used.
Found in a magazine 73 for radio amateurs, this circuit operates in the 144 MHz band, at a...
We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The...
We found this amplifier circuit for inductive audio pickups in a documentation from the 70s. The...