This circuit was found in Mullard's transistor application manual from 1960. More modern transistors can be used. The zener diodes used have the indicated voltages.
This circuit in a receiver that allows the capture of distant stations with short waves. The...
We find this filter with three operational of the time in an American documentation of the 80s....
This FM receiver tuning step circuit was found in a 1960 documentation. No information about the...