This circuit was found in Motorola's Linear Interface ICs of 1993. The integrated circuit used is not common and the load current depends on the Triac.
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...