5V Powwr Supply Crowbar protection MC3425 (CB14530E)

This circuit is suggested by Motorola in its 1990 Linear Databook. The integrated circuit is no longer common in the market.

Push-pull stage (CB21796E)
This circuit with 1W of output was found in a Mullard manual from 1960. The consumption is low and...
Oscillating flyback converter (CB9616E)
This circuit was found in an old documentation. It converts DC voltages and its maximum current...
Variable zener diode (CB9969E)
In the figure we have the way to implement a 5 to 45 V zener diode with 50 mA of maximum current...