Low Frequency Doubler MC1556G (CB14564E)

This circuit is from Motorola's 1990 Linear Databook. The circuit employs a component that is no longer common today.

Recording Heads Preamplifier (CB15821E)
The integrated circuit used is uncommon today. The numbering in parentheses is for the second...
DC Motor Reversal (CB14959E)
This circuit uses two relays to reverse the direction of rotation of a direct current motor. It...
Lights On Reminder (CB12637E)
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...