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High sensitivity TEA5711 receiver allows the reception of distant stations from over 150 miles (240 km) away. Good selectivity is obtained with narrow bandwidth ceramic filters. AFC automatic frequency control locks on stations for drift-free reception. Stereo separation which depends on signal strength is very apparent on strong signals. And with high quality headphones, the sound is rich with deep base and high treble, for hours of enjoyable stereo music.
The receiver is housed in a 6 x 4.5 x 2 inch box I made from pieces of single-sided PC boards. Controls from left: on/off, volume, stereo/mono and tuning. A 7 to 1 vernier embedded in the tuning capacitor coaxial shaft offers smooth tuning. Stereo reception is indicated by the red LED. The stereo/mono switch allows clearer reception of weak stereo stations. High quality stereo headphones with 32 or 60 ohms impedance can be used to listen to the receiver. A removable telescopic antenna can be swiveled, extended and collapsed for best reception.
The circuit was built "Manhattan style" on a 2 13/16 x 3 15/16 inch piece of single-sided PC board. An SDIP socket was used with the TEA5711 to allow easy connection of the components. Slug-tuned coils (red squares) were adjusted and sealed with wax for stability. Ceramic filters and resonator are on the right side of the TEA5711 IC. Black trimmer pot (lower left) is adjusted once for best stereo separation. Stereo amplifier TDA7050 sits in a DIP socket (lower right). Dual-ganged volume control is at lower center. Dual-ganged variable capacitor with coaxial vernier shaft is at left. 4 pieces of PC boards with center nuts at the corners are used to hold a cover. Battery holder at top right holds 2 AA batteries which supply 3 volts to the receiver.
Close-up view of the board. A printed circuit was not necessary to assemble the high frequency circuitry. The copper plane served as a common ground and improved stability. Bending the pins of the TEA5711 SDIP socket was a frustrating experience as they were fragile and prone to breaking; the missing pin on the left actually broke, but luckily for me it was not a required pin.
A piece of single-sided PC board attaches to the 4 supports at the corners with machine screws and serves as a cover for the receiver. 3 rubber feet on the cover allow the receiver to be used on any surface.
The circuit is a slightly modified version of the application circuit for the TEA5711 AM/FM stereo receiver IC.
Related Links
Downloads
Stereo FM Receiver - Link
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