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.

Voltage Sensor (CB13307E)
This circuit, from an old publication from the 70s, can be assembled with a 2N2646 unijunction...
Center Tap Simulation with Diodes (CB4140E)
In the figure we show how two diodes can be used to simulate the center tap of a push-pull driver step....
100 Hz High Pass Filter with the 741 (CB11463E)
The circuit presented was obtained from an Electronics Now magazine from February 1995. The...