Old superheterodyne (T1611E)

Found in a 1949 Radio Electronics, this commercial circuit was found in many countries, including Brazil.

12 V x 10 A Power Supply (CB18219E)
This source for devices for automotive use was found in a 1985 documentation. The power...
Power Supply Monitor (CB14972E)
This circuit trips when the voltage set in the pot is exceeded. The tone depends on C3 and...
110 V Lamp Shift Register (CB14710E)
The circuit shown is from the 1977 GE semiconductor manual. The circuit uses a controlled silicon...