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.
The small transmitter shown in the figure can generate signals in the range of 50 MHz to 200 MHz....
We found this circuit in a 1979 French publication, but it can still be assembled today with...
Division of a digital signal up to 4098 can be done using the 4040 IC as shown in Figure bellow....