This circuit was found in the component's own manual, which is not very common nowadays. Note that the circuit requires the use of a symmetrical power supply.
An interesting point of this project is that it is used not only for a robotics project but also...
This remote control by sound or Vox was obtained in a 2004 publication. The circuit is biestable...
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...