0 to 25 V x 100 mA Regulator MC1466L (CB14521E)

This circuit, which uses an unusual integrated, is from the Motorola Linear Databook of 1990. Transistors admit equivalents.

Automatic Battery Charger (CB19326E)
This circuit was obtained in European documentation from the 1980s. Transistors support...
Timer with Relay 14538B (CB18466E)
This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is...
10 kHz Low Pass Filter (CB13591E)
This Salen-Key filter can use any operational amplifier and other frequencies can be obtained by...