SCA broadcast receiver circuit diagram

This picture is a circuit diagram of an SCA broadcast receiving information machine modified from the integrated block LM567 . The narrow center frequency band of the LM567 phase-locked loop can basically meet the demodulation function of SCA broadcast. R2, potentiometer W, and C6 between pins 5, 6, and 7 of LM567 determine the center operating frequency of the voltage-controlled oscillator inside the integrated circuit. The center locking frequency can be adjusted by the trimmer potentiometer W. Inductor coil B can be wound with 0.088 high-strength enameled wire for 360 turns on the I-shaped core of a 10X10 (mm) medium frequency transformer. The inductance is 3mH. The resonant capacitor is a 2200pF ceramic capacitor. W can be a trimmer resistor. There are no special requirements for other components.