We find this circuit in an Electronics Now. The indication of the logic level is done on a 7-segment display according to the connections given in the diagram.
The integrated circuit can be replaced by more modern operational amplifiers like the 741. The...
Using a 741 op amp with symmetrical source, this circuit was found in a 1982 documentation. The...
50 This transistorized guitar amplifier was featured in the November 1968 issue of Radio...