Or integrated circuit used in this circuit two years 80 and little common in those days. The two component heats depend on the triac trigger characteristics.
This circuit was found in a 1977 documentation. With it we have the direct indication, through LEDs...
In the figure we have the CMOS logic test circuit developed with the 4049. The circuit activates three...
This headlight reminder for your car was found in the May 1970 issue of Radio Electronics...