Up to 3 minutes timer (CB21429E)

We found this circuit in a 1967 General Electric SCR manual. The time is set to R1 and depends on C1 which must be a low-leak capacitor.

| Clique na imagem para ampliar |

First line selector (CB9414E)
This interesting circuit for analog TV selects the first line of a frame. The circuit was found in a...
First pulse preserver (CB9259E)
This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be...
Symmetrical regulator (CB8698E)
Found in a 1968 documentation, this circuit provides symmetrical voltages determined by component...