2N4987 and 2N4990 (IP057E)

Unilateral switch (SUS) with 8 V of trigger voltage. This component is used to control SCRs and other applications.

Water Operated Relay (CB24075E)
Using the CA3018 released at the time, this circuit was found in the August 1970 Radio Electronics...
Low distortion sinusoidal oscillator (CB8642E)
Found in a 90s Linear Technology documentation, this circuit uses an operating system of the time....
Relay Control Interface or Shield (CB13108E)
To control relays safely with double insulation through the parallel port, we suggest the circuit in...