Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of the era, the PA237. The circuit runs on 24 V and excites a 16-ohm speaker.
This circuit was found in Ferranti's 1967 documentation. The circuit drives a 40 V relay, but it can...
The circuit of the figure serves the same purpose as the previous one (CB5057E), but has a...
We found this circuit in a 1960 Sylvania transistor manual. The relay can be 12 V and C1...