This FM receiver tuning step circuit was found in a 1960 documentation. No information about the coils is given, but the FI used at the time was 10.8 MHz.
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...
This circuit is from an old Italian publication, using components that are no longer manufactured, but that...
We found this switching circuit in a technical documentation from National Semiconductor. The...