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.
Texas Instruments ESD122 Electrostatic Discharge Diodes (ESD) can be ordered from Mouser...
This alternating flashing system uses two-color LEDs. The circuit is from a Radio Electronics...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...