Light beam switch (CB21413E)

This circuit was obtained from a 1965 General Electric SCR manual. The components are from the period.

Collector Triggered Flip Flop (CB995E)
This bistable or flip-flop is triggered by a negative pulse applied to the collector of the...
Power Inverter (CB12631E)
This circuit is old, but it can be easily implemented with TIP42 transistors and a 6 + 6 V or 9 +...
Relay Shield LM111 (CB20168E)
This circuit is from the LM111 manual of the 1980s. The component no longer exists, but...