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Problem with FM VCO alignment in FM Radio TEA5757

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tipet20002000

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Hello:
I have build a FM radio using STR TEA5757, according Philips Application note AN99041.

I have a problem with FM VCO alignment. If you align VCO coil the tunning voltage should change between 0.8V(88MHz) and 1.9V(108MHz), but in my PCB this isn't happen.
If I align my VCO coil the tunning voltage is constant in all the FM band.

Could anybody help me?

Thank you!
 

jones

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tea5757

I Suggest You can re-design TEA5767
It better than TEA5757
 

egemini

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fm radio tea5757

but have philips released that chip TEA5767
 

hotwaterwizard

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using tea5757

Do you still have the Application Note? We need it.
 

tipet20002000

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philips tea5757

Hi,

Here you are documentation about TEA5757. But I've make a new design with TEA5768 and it's better, less components, no adjust needed, ....

Best regards.
 

hotwaterwizard

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diagram radio with tea5767

Wow This is great Thank you so much.
 

lqdjdy

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tea5768hl diagram

This is great Thank you so much.
 

ultravox

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schematics radio with tea5767

Thank you.

I finally used the TEA5768HL in my project.



Size approx 35x35mm. If someone is interested in the gerber, pls. mail me.

Regards, Ultravox
 

ashraf459

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tea5768 problems

Would anybody snd me a circuit diagram which may be used to increase the sound quality of fm receiver??

Added after 1 minutes:

 

jyfx

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tea5768hl in my project

Wow This is great Thank you so much.

Added after 1 minutes:

I want to know the antenna about this!
 

hotwaterwizard

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tea 5757

This looks like a power supply circuit.
 

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