Wien Bridge Oscillator (CB8093E)

This circuit was found in a Popular Electronics from the 90s. Transistors admit equivalents, as well as the operational.

Hand Dryer (CB18786E)
With this circuit it is possible to use a common hair dryer as a hand dryer. The circuit is timed...
8 Channel Encoder with 4017 (CB4530E)
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
Continuity Tester (CB10617E)
This circuit was obtained in a 1975 magazine, but it can be easily assembled using BC548...