This power control from a 1968 Motorola manual shows how to use a contemporary diac as a zero-crossing detector. The SCR is of the type depending on the power of the load.
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...