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TDA7021T Reciever, Need some help.

 
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TDA7021T Reciever, Need some help.
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Alexander
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Joined: 25 Jan 2005
Posts: 2
Location: Sweden

Post TDA7021T Reciever, Need some help. Reply with quote
Hello,

I'm (or we, there are two persons here) are trying to build a FM radio just for fun, we don't know so much about electronics but we think it's fun just to get something to work in hope of in the end understanding something of what we actually did . We are at the moment using a TDA7021T circuit for this purpose and are now working accordingly to this schematic:

Very high res - about 2mb
Low res - about 0.5mb

But we have now encountered a problem. We can't figure out what values R1, R2 and the variable coil on pin nr.5 should have and we can't really find anything more on the internet than russian/japanese pages about this and not even those are to any help.

We are not asking you to do our work (even tho we wouldnt mind at all ) but just some help on this issue.

Sincerely
Alexander
Tue Jan 25, 2005 8:03 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
Allways try to get manufacturers datasheet:

http://www.semiconductors.philips.com/acrobat/datasheets/TDA7021T_CNV_2.pdf

Than see page 9!

220K and 33K

Have fun with this little radio and let us know how it goes!
Kudos for your spirit!

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Wed Jan 26, 2005 12:02 pm View user's profile Send private message Visit poster's website
Alexander
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Joined: 25 Jan 2005
Posts: 2
Location: Sweden

Post Reply with quote
Thanks alot for your reply! Now we can continue to build our radio. Will keep updating here when something new happens (probably a problem) but we will try our best, arr!
Wed Jan 26, 2005 11:21 pm View user's profile Send private message
pcs
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Posts: 3063
Location: Radio Land

Post Reply with quote
ok

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Wed Jan 26, 2005 11:39 pm View user's profile Send private message Visit poster's website
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Post Hello TDA7021T friend... Reply with quote
Hello my friend,

I too...just received a TDA7021T IC from Philip's Semiconductors.

I wanted to know how is your project coming along...since I too will be building the receiver.

I can learn a few things about you and your project, as I will go down the same road...trying to get the unit to function good.

Do reply back to me...as I await a reply, my friend!

Sincerely,

Patrick Cambre USA
Mon Apr 04, 2005 6:15 pm
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