A filter carrier with narrow bandwidth circuit can be designed using this circuit diagram.
This filter carrier with narrow bandwidth circuit is constructed from standard components and is still a very narrow bandwidth, making it ideal for CW applications. As seen in circuit diagram, cascade filter is simple, standard 1 MHz crystal.
Using electronic circuit diagram can b designed a very simple long wave radio and medium wave radio receiver .
This long wave radio and medium wave radio receiver circuit diagram is designed using TBA120 integrated circuit and common electronic components.