Colpitts Oscillator with MOSFET (CB8141E)

Found in an American documentation from 1969, this circuit operates at a frequency determined by the resonant circuit.

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5 W Amplifier with High Voltage Transistors (CB13977E)
This circuit makes use of high voltage transistors and can be connected to the 110 V (117 V)...
Q Multiplier (CB20279E)
This selectivity multiplier circuit for 455 kHz IF receivers was found in American documentation from the...
Touch switch (CB8727E)
Found in a 90s Popular Electronics, this touch switch uses a single sensor. PLLs are common today....