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Radio circuit diagrams electronics projects for radio transmitter, radio receiver circuit, rf amplifiers, rf boosters and some other related RF circuits like: fm antenna booster, microwave transmitter and wireless modules.
An antenna switch circuit can be designed using some electronic parts like in figure below.
A filter carrier with narrow bandwidth can be built using electronic diagram below.
Using TBA120 and some common electronic components ca be build a very simple radio receiver for medium and long rf bands.