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
FM receiver with TDA7000
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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.
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.
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
-
- New registered user
- Posts: 2
- Joined: Wed Dec 15, 2004 5:22 pm
Corrected Schematic
Hi!
No problem...
Here is the the corrected schematic, which works great for me:
Christian
No problem...
Here is the the corrected schematic, which works great for me:
Christian
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.
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
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128