Dual tube receiver (T1600E)

This receiver employs two dual triode valves. Receiver is from a 1949 Radio Electronics. Power supply not provided.

Light controlled switch (CB22139E)
This circuit was obtained from an old English book. Transistors are types of the time....
Debounced flip Flop (CB9256E)
Found in an American magazine from 1968, this circuit produces pulses free of bounces on its...
Single Pulse (CB20138E)
We found this configuration with a logic circuit that is now uncommon in an 80's documentation. The circuit...