We found this circuit in a Linear Technology documentation from the 80's. It has a demodulator, being suitable for links and remote controls. Note the unusual type of detector configuration.
This circuit was found in a 1999 publication. Its purpose is to flash two LEDs according to the...
This two-transistor emitter-coupled oscillator circuit with capacitive feedback was found in the...
This circuit is from an old operational amplifiers manual. However, the setting applies to modern...