We found this circuit in a Linear Technology documentation from the 90's. Check the availability of new equivalents for the integrated if you need a new project.
This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V...
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...
The circuit shown by figure 1 consists in a Schmitt-Trigger using two common general purpose NPN...