We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
This circuit can generate signals from 1 Hz to 20 Hz in 2 Hz ranges. The table next to the diagram...
The operational 3403 is not currently common, but a similar configuration can be made with modern...
In this circuit, xx can be 05, 06, 12 or 15 for output voltages of these values. The integrated circuit...