Found in 1969 RCA documentation, this dimmer uses a dual time constant setting to achieve better control of the triac's trigger point.
We found this alarm circuit in a Radio Electronics magazine from July 1990. The power transistor must be...
This circuit was obtained from old documentation and has a very simple 6 or 12 V configuration...
This is one of many versions of this circuit that the reader can find in this section. The circuit...