This analog ammeter circuit was found in documentation from the 1980s. The components admit equivalents and the scales are determined by the values of the components in the range selection.
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...