This Wien bridge oscillator was found in Radio Electronics from the 90s. The circuit uses the 741 which is a current component. The circuit requires a symmetrical power source.
This simple circuit for the 3 to 30 MHz range was found in the Electronics Experimenter Handbook...
This simple circuit causes an LED to light up when the battery voltage drops below the voltage set in the...
This 80's circuit uses an integrated amplifier of the era, but nothing prevents it from being...