VCO with optocoupler (CB21501E)

This circuit was found in a 1967 Raytheon optoelectronics manual. The circuit uses tubes.

| Clique na imagem para ampliar |

Simple Emitter Follower (CB25617E)
The figure shows how to implement a stage with an emitter follower. The stage has high input...
SCS timer (CB21411E)
This circuit for timing small loads was found in a 1964 General Electric documentation....
28 V x 500 mA Parallel Regulator (CB12843E)
I found this typical shunt regulator circuit in an Argentine magazine from 1973. The circuit can...