Problem with FM VCO alignment in FM Radio TEA5757

[tipet20002000]

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]

tea5757

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

 

[egemini]

fm radio tea5757

but have philips released that chip TEA5767

 

[hotwaterwizard]

using tea5757

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

 

[tipet20002000]

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]

diagram radio with tea5767

Wow This is great Thank you so much.

 

[lqdjdy]

tea5768hl diagram

This is great Thank you so much.

 

[ultravox]

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]

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]

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]

tea 5757

This looks like a power supply circuit.