Pre selector with varicap tuning (CB9172E)

This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The double port MOSFET is an unusual component today.

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Sequencer for Stepper Motor Control (CB11862E)
This circuit generates sequenced pulses to control a stepper motor. The speed at which the pulses...
Quinary Trigger (CB6805E)
Suggested by an American publication, this circuit has 5 operating conditions indicated in the...
transistorized differential amplifier (CB25639E)
This circuit uses matched transistors. The circuit is from Electronics Now magazine and has a...