This programmable sound circuit was found in the July 1978 issue of Radio Electronics magazine. It uses an integrated circuit of the time dedicated to producing effects.
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...