Hi RadioMate,
I made a vacuum tube FM stereo tuner and amplifier in the early '60s when I went to university.
My first job in 1965 was with Philips in Car Radio Engineering. The car radio and cassette
player used transistors, no ICs. I used a Motorola FM stereo decoder IC in my version the next year.

Years after Philips lost the car radio contract in Canada with Chrysler who began to make their own car radios, Philips made the TDA7000 FM tuner IC that was very strange with low frequency opamp active filters for its IF. It had severe image frequency interference that was covered up with a muting circuit. It was a horrible 'radio".
The latest FM tuner IC is the TDA7088 that is used in cheap "radios" for sale for only $1.00 at The Dollar Store. I called those "radios" the cheap ones.

__________________
Uncle $crooge

 

Hi ag,
nice background

I am an Electrical/Mechanical engineer, but my interest in radios goes way back...

I have a couple TDA7000 ICs in my junk box, but I don't think I'll bother making radios out of them. No FM radio should be without a stereo decoder, in my opinion.

I am well aware of the TDA7088.. dismal, and it uses internal RC components for IF selectivity! The only positive about it is the push-button search tuning, and still not so good as one can only tune up the band and not down.

Do visit my homemade radios page, wont you? you'll find a 9-tube/3-IC stereo FM receiver I made a few years ago.

 

Your webpage mentions your board construction as "Manhatten style." What does that refer to, exactly?

__________________
Go Trojans!

 

http://www.opencircuits.com/Manhattan_style

I use to call this skyscraper circuits.

 

Cool, thanks for the reference. I've never seen this before...

__________________
Go Trojans!

 

I guess Mikebits beat me to it... Manhattan style: small square or round pieces of single-sided PCB pieces are glued on the board and used to connect and hold the components. Very easy to implement when space is available, but doesn't beat printed circuits for "microscopic" circuits. Hope this helps...

 

Can you consider CXA series of SONY though SMD, they are manageable. and available in market as replacement spares. Making a pcb may not be a problem. i have a radio SONY ICF SW11 and works well. One of acclaimed set is SONY ICF7600GR (digital though) and you may well be able to use the same chip as used by them.

__________________
Regards,
Sarma.

 

Like I said, it's a wideband front end, the entire FM band (and considerable above and below) come romping in - excessively strong signals will completely overload the front end.

Like we've said, AGC is applied to the front end only (in decent quality radios), to prevent serious overload - there's no need (or use) for AGC in the IF chain.

Sounds like you're not in an area that has strong enough signals to cause a problem, neither am I, and I've NEVER seen a problem on my car radio as I've driven round the country. However, this in no way means it's not a problem, because it is - and in some areas high quality radios (with AGC, or a Local/DX switch) are the only ones that work.

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

Decent quality radios use AGC for the front end AND the IF stages, it's a well known fact. FM receivers with limiters don't apply AGC to the IF.

In my receiver, the antenna input is broadly tuned but the circuit has a tuned RF circuit down the line. If there is no RF amplication before that tuned circuit, there will not be signal break through, or whatever they call it.

 

mvs sarma, SMD is a pain to handle by homebrewers. I went with the TEA5711 and not the TEA5711T because it is SDIP (Shrink Dual inline package) and I could plug it in an SDIP socket and spread the pins to connect the components. I looked for SDIP to DIP adaptors.. the retailers don't sell them in small quatities.

 

Very impresive , ihave to do this project at the university.
Can you help me with more ditales , please ???????????????????

 

What are you studying in university? How to solder?
The circuit is already designed on the IC's datasheet.
The TEA5711 radio IC is obsolete and is not made anymore.

__________________
Uncle $crooge

 

ronibog1982 what details do you need? I used the application circuit on the TEA5711 spec. sheet, without the AM section. You can see the parts placement on my website. But like audioguru said, the TEA5711 is not in production anymore and difficult to find.

http://www.midcenturyradios.com/HM-FM-Stereo.html

__________________
radiomate
www.midcenturyradios.com

 

The IC is a very very hard to find one!

__________________
Likes to have some rare,nostalgic transistors for my breakfast...

 

rahulan999 you bad boy! why don't you dedicate one of your many TEA5711 ICs to ronibog1982 so he can do his project, hummm?

__________________
radiomate
www.midcenturyradios.com