This setting applies to virtually any photo transistor and any operational amplifier. The power supply must be symmetrical, and the gain is determined by the relationship between R2 and R1.
This is the project found in a 1981 publication, but it is still viable. It is a simple AM...
This 2-quadrant modulator circuit was found in the May 1988 issue of Radio Electronics magazine. The...
Found in Radio Electronics from May 1959, this transistor tester is quite sophisticated. The...