Described in an article in the March 1979 issue of Radio Electronics magazine, this generator was used in an audio test station. The frequencies are given by the capacitors.
Using the well-known SAA1027, this circuit serves as interface for PC. No English documentation was found...
Found in a 90’s American documentation, this circuit indicates the frequency of input pulses up to 1...
With the circuit shown, you can have a fast response with a Darlington configuration. The circuit is...