Found in American documentation from the 90's, this circuit can be implemented with modern equivalent components. Observe the symmetrical power supply.
We found this circuit with SCRs and unijunction in a Radio Electronics magazine from June 1969. The...
This circuit was obtained in an old documentation, receiving the medium wave range. L1 has 20 + 60...
You can program the 4018 in other ways, as shown in the figure. In this 7 divider configuration, for...