Optical shield (CB20698E)

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

Transparent Octal Latch (CB15750E)
The circuit shown in the figure on the right can be used on a data transfer bus with the use of an...
Simple Timer (CB18551E)
This timer was found in Japanese documentation from the 1960s. The transistor can be replaced by...
Triangular Oscillator (CB14937E)
We found this circuit in a documentation from the 90's. The circuit can be assembled with 741...