Simple 5V regulator (CB8815E)

This simple 5.6 V regulator circuit was found in a 1966’s Philips. The zener can be changed to obtain other voltages.

Amplifier with Class B output (CB22234E)
This class B push-pull amplifier circuit with a few hundred milliwatts of power was found in an...
2 W amplifier MC13060 (CB14576E)
This circuit can work with power voltages from 6 to 35 V, being suggested by the Motorola Linear...
Modem and fax protector (CB8191E)
This circuit is from an old Electroics Now. Its purpose is to protect the fax and modem lines of...