This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
In figure we have a three-phase AC motor control for voltages up to 600 V or 1200 V depending on...
This circuit can drive a white LED from a 3 V supply. The circuit is intended to supply White LEDs...
This application of the RCA integrated circuit released at the time was found in the August 1970...