Voltage doubler for EEPROM programmer (CB9323E)

This circuit from the 90s, was found in an Electronic Design of the time. The components used are uncommon today.

Variable Voltage Controlled Attenuator (CB4236E)
This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in...
Harmonic generator (CB9454E)
Found in a 90s Electronic Design, this circuit generates harmonics from a sinusoidal input signal....
Water alarm with lock (CB6957E)
Published in an old Popular Electronics, this circuit makes use of components that are still...