Triac Heating control (CB21372E)

We found this circuit in a 1966 RCA manual. The integrated circuit is unusual, and the Triac must match the load.

DC Voltage Doubler (CB12290E)
This circuit is from an English publication from 1993 but can be easily assembled with the BD135...
LM317K Regulator (CB24817E)
We found this variable regulator circuit in a Radio Electronics issue from July 1984. It is one of...
Buffered Oscillator (CB4807E)
This oscillator with operational and CMOS buffers generates complementary signals. The circuit is...