Relative impedance meter (CB7487E)

Found in a 1960 Sylvania manual, this circuit can be implemented with a modern equivalent transistor like the BC558.

TLC555 PWM Motor Control (CB26038E)
This simple circuit for motors that depends on the MOSFET used was found in the January 1998...
Two Input Shield (CB19753E)
This transistorized shield also functions as a logic gate. The power supply can be in the range of 4.5...
Small audio oscillator (CB8447E)
Found in a 90s Popular Electronics, this Hartley oscillator uses an output transformer of the type...