Optical shield (CB20698E)

This circuit was found in American documentation from the 90s. The coupler is the type that uses a photo-Darlington.

Dimmer with UJT and Traic (CB25086E)
The circuit is from a Radio Electronics magazine from October 1987. The Triac must be equipped with a...
Expander with the L150 (CB15195E)
The integrated circuit used is not common today and the voltage gain is unitary. The circuit is...
5 and 12 V switching power supply (CB8853E)
This source with two symmetrical output voltages was found in 90s Radio Electronics. The 22 V...