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FM receiver with TDA7000

 
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FM receiver with TDA7000
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cybergrisu
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Joined: 15 Dec 2004
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Post FM receiver with TDA7000 Reply with quote
I tried to build a FM Reveiver according to the given schematic (http://www.pcs-electronics.com/schematics/Tda7000Rx.jpg).
The frequency adjustment doesnt work and i think i know why:
It seems that the whole oscillating circuit is wrong. The 22k potentiometer is between the +5V and 0V and the output only goes to a 1uF Capacitor. So it doesnt have something to do with the frequency....

Am i right?

My solution was a redesign of this part: the output of the potentiometer goes between the varicap diode and the 10nF Capacitor. I also connected the whole ocillation circuit to +5V instead of 0V.
If somebody wants to see my solution, please tell me and i make a scan.

Christian
Wed Dec 15, 2004 5:36 pm View user's profile Send private message
pcs
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
You're right. Had a look at the jpg and its not right.

Can you make a scan with your corrected solution?
I will update the pic on the website.

Thanks for pointing this out, missed this error.

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Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Fri Dec 17, 2004 3:39 pm View user's profile Send private message Visit poster's website
cybergrisu
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Joined: 15 Dec 2004
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Post Corrected Schematic Reply with quote
Hi!

No problem...
Here is the the corrected schematic, which works great for me:



Christian
Sat Dec 18, 2004 1:57 am View user's profile Send private message
samadica
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Joined: 10 Sep 2009
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Post Reply with quote
I wanna build a fm reciver by TDA7000, but i want to simulate it with a software,how i can do that?can i do that with orcad?
Fri Sep 18, 2009 12:11 pm View user's profile Send private message
pcs
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Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
You need spice model first for tda7000 and I don't think you'll get one.

In short, forget about simulating a complex IC like this.

Start by simulating simple circuits.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Sun Sep 20, 2009 11:57 pm View user's profile Send private message Visit poster's website
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