60 seconds delay lock (CB7231E)

This General Electric circuit triggers on after 60 seconds. The circuit is from 1967 but can be implemented with current components.

| Clique na imagem para ampliar |

Darlington Touch Switch (CB7191E)
This circuit is from 1968 General Electric documentation. It can certainly be adapted for any...
Capacitor Tester (CB4391E)
This tester from a 1960 magazine is only for capacitors with insulation voltages above 200 V (110...
Unijunction Telegraphy Oscillator (CB12283E)
Found in a 1991 publication this circuit can be assembled with more modern components. We can use...