TDA7000 vs. TDA7088

Discussion in 'Homework Help' started by yling, Jun 25, 2008.

  1. yling

    Thread Starter New Member

    Jun 25, 2008
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    I would like to know what's the difference by using TDA7000 and TDA7088 to build a FM radio receiver?
     
  2. Audioguru

    New Member

    Dec 20, 2007
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    The TDA7000 has not been made for many years but you might find one somewhere. It is in a normal DIP case.

    The TDA7088 is copied in China, is in a tiny surface-mount case and normally uses Scanning for tuning.

    Radios using them have very poor performance.
     
  3. yling

    Thread Starter New Member

    Jun 25, 2008
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    I would like to build one FM radio receiver and I am not sure if it's better to use TDA7000 or TDA7088.
     
  4. Audioguru

    New Member

    Dec 20, 2007
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    The "radio" will be very poor. I can buy an assembled one at The Dollar Store for only $1.00. It picks up strong local FM stations with distortion. Fairly strong stations fade in and out with distortion. Weak stations that are perfect on my home stereo and on my car radio but are not picked up by the poor radio. Many stations near a strong local station's frequency are not picked up.

    The TDA7000 is obsolete and is not made anymore. Can you buy one somewhere?
    The TDA7088 is in a tiny surface-mount case. Can you solder it?
     
  5. weije1986

    Member

    Apr 19, 2008
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    well .. i am doing radio for assignment also . i found out tat tda7088 is really too small to solder .
    however , tda 7000 comes with normal DIP which is nice to solder .
    will let u know futher details as i planning to complete my circuit on next week
    Anyone knows wat value of capacitor and inductor i nid to use on pin 5 and 6 at tda7000 if i want to receiver signal from 88MHz to 108MHz ?
    i read some website using 56nH , tuning capacitor 0-30p series wif 56pF , and parallel wif 27pF . Is it correct ? any way to calculate it ?
    THank you
     
  6. Audioguru

    New Member

    Dec 20, 2007
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    It is difficult calculating low value capacitors and inductors because stray capacitance could be almost as much. Try it to see.
     
  7. weije1986

    Member

    Apr 19, 2008
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    my lecturer says that it is better to do straight on the board that we wanted to pass up . eg : IF the circuit is working fine on breadboard , it might not work when u solder it onto veroboard . and vice versa .
    jus use try and error method T.T"
     
  8. Audioguru

    New Member

    Dec 20, 2007
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    The FM broadcast band is at the very high frequency of 100MHz. A breadboard has way too much stray capacitance and inductance for such a high frequency.
    If you use a tight layout and cut the tracks to short lengths then Veroboard might work.
     
  9. SgtWookie

    Expert

    Jul 17, 2007
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  10. mozikluv

    AAC Fanatic!

    Jan 22, 2004
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    if you are from asia, you can check with RS Component. they have offices in india, thailand, singapore, taiwan and the philippines.

    moz
     
  11. weije1986

    Member

    Apr 19, 2008
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    i recommand farnell . RS component is overpricing :)
     
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