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.
This circuit is from National Semiconductor using an LM11, which is uncommon nowadays. The circuit...
This filter with a Q factor of 50 was found in the Linear Applications Handbook by National...
The purpose of this circuit is to turn off a lamp after a few seconds or minutes depending on the...