We found this circuit in the March 1992 issue of Radio Electronics magazine. The circuit has a range from 1.25 V to 1 kV. The formula for the voltage values is given.
This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V...
This circuit has been found in operational documentation of the 1970s. The circuit has a fail-safe...
This simple circuit does not use active components and uses a small speaker as a microphone. The...