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.
Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76...
This circuit was found in a European technical documentation from 1991. It is a circuit that must...
This harmonic oscillator controlled by crystal was found in an American documentation of the 90's....