Found in a 1967 RCA documentation, this AC power grid contactor can be fitted with modern equivalent components. The SCR and the diodes must be according to the load current.
The circuit is suitable for small animations, with the movement effect of the LEDs in a matrix...
This QST circuit generates 4 frequency signals according to the crystals used. Transistors admit...
The microwave sensor of this circuit is a common ceramic capacitor. The circuit is from an 80's...