FM receiver circuit

FM receiver circuit

CXA1019 FM receiver circuit

A high quality FM receiver circuit based on CXA1019 IC is shown here. CXA1019 is a bipolar silicon monolithic FM/AM radio receiver IC from Sony. Built in circuitries inside the CXA1019 include RF amplifier, mixer, oscillator, IF amplifier, quadrature detection circuit, tuning LED driver electronic volume control, detector etc. FM section of the IC is only utilized in this circuit. The IC can be powered from anything between 3 to 7V DC and can drive an 8 ohm loudspeaker.

Notes.

• Assemble the circuit on a good quality PCB.
• For L1, make 2.75 turns of 22 SWG enamelled copper wire on a 5mm diameter plastic former.
• For L2, make 3.75 turns of 22 SWG enamelled copper wire on a 5mm plastic former.
• T1 is a FM IF transformer.
• CF1 is a 10.7MHz FM ceramic filter
• C4 is a 30pF dual gang FM tuning capacitor.
• The circuit can be powered from anything between 3V to 7V DC.
• Using a battery for powering the circuit will reduce noise and improve the performance
• If you using a battery eliminator, then it must be well regulated and free from noise.
• K1 can be a 3W, 8 ohm loudspeaker.
• A1 can be a 100cm long whip antenna.

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