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The receiver is built around TEA5711 and TDA7050 ICs. The receiver section of the TEA5711 features high selectivity with distributed IF gain, good strong signal handling, AFC (automatic frequency control) for drift-free reception, a mute circuit to decrease static on weak stations, and an MPX decoder for stereo reception. The TDA7050 features low distortion and is rated at 75 mW output per channel. The application circuit uses 3 volts to power the receiver, but I decided to run my receiver with 4.5 volts for increased audio output.
I have received stereo transmissions all the way from Cyprus, 240 km (150 miles) away. This attests to the high sensitivity of the TEA5711. The AFC functions well and provides drift-free reception. AFC level can be controlled with the value of the capacitor at pin 20 of the TEA5711. Adjacent channel selectivity depends on the two ceramic filters used, which plug into sockets in this receiver. I tested a few of these and settled for the narrow filters with 150 KHz bandwidth with very good results. I tried a ceramic filter in place of the ceramic resonator at pin 5, as Patrick did in his receiver, but the sound was distorted. A ceramic resonator is definitely the way to go here. I used 0.47 uF capacitors at pins 2 and 3 instead of the suggested 0.1 uF in the application circuit, to improve base response. Stereo separation is a function of signal strength, and is similar to that in my stereo MPX decoder wich has 45 dB separation. With good quality headphones, the sound is rich with deep base and high treble and offers hours of enjoyable stereo music. All in all, this receiver turned out to be a good performer and a pleasure to listen to.
Related Links
Downloads
FM Stereo Receiver - Link
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Arduino Prototype Kit
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Accurate LC Meter
