A stereo FM receiver using the TEA5711 IC

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You can try the basic principle as like here:



In the first image you can use the resistance as the wiper of a pot(say 10K according to input voltage and tuning range..do calculation) to change the reverse bias voltage across the varactor. Important thing is you need to isolate the bias voltage from entering the RF loop. A capacitor used here for isolation.
 
Last edited:
pravpa said:
could Please explain me with using TEA5711 circuit diagram, how to use varactor diodes for Tuning.
Click to expand...
The schematic of a manually tuned AM/FM radio on the datasheet shows a 4-gang tuning capacitor. Two of the gangs are for AM and two are for FM. Simply use a suitable varactor diode for each. The varactor diodes are tuned by changing the voltage with a pot of a regulated voltage.
 
can you please tell me which one is better to use; tea5711 or sony cxa1538 . both are stereo ic. i have decided to build this receiver and find both ic are available in my area.
 
@skldj,
why at all to build an FM radio when it can be bought dam cheap? your effort can better serve you, on any other gadget that could help your education and or hobby.
 
mvs sarma said:
skldj,
why at all to build an FM radio when it can be bought dam cheap? your effort can better serve you, on any other gadget that could help your education and or hobby.
Click to expand...

it feels good when i do it by myself..
 

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can i use 3n200 mosfet in place of bf981. because it is hard to find..
 

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ok, got the email too. Shall be dispatching on Monday by speed post. i would intimate you the tracking #.
 
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