three-level touch control (CB7040E)

Found in Popular Electronics this circuit uses common components to control an incandescent lamp with three levels of intensity

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Transistorized receiver (CB22218E)
We found this circuit in a documentation from the 50s. It is based on CK722 germanium transistors. The...
60's crystal radio (CB22171E)
Found in an English publication from the 1960s, this circuit uses period components, including the...
TTL Oscillator (CB6150E)
This oscillator can generate 2 to 10 MHz signals and was found in an American 1980s documentation. The...