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 grid-dip meter was found in a 1956 documentation from Sylvania. It can be implemented with...
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...
Mouser Electronics already has Intersil's IS8215M Power Step-Down modules, suitable for...