The integrated circuit used is uncommon today. We found this configuration in Motorola's 1990 Linear Databook. The triac can be any of the TIC series.
In the figure we have the way to use a common operational amplifier for AC signals. The resistor...
This regulator circuit is for high voltage inputs making its initial reduction so that a common...
This circuit of an old publication makes use of SCRs that admit modern equivalents. The frequency...