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Old 7th January 2016, 02:38 AM   #1
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Location: Kavala
Default diy FM-Stereo-Radio ?

I am not experienced with diy, but want to try this FM-Stereo-Radio
Here you can see a video of this.

The description in German is quite detailed and I know that the main difficulty is configuring L1, L2 and the trimmers. But I want to try it. I will keep you informed!

Last edited by hariskar; 7th January 2016 at 03:18 AM.
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Old 7th January 2016, 03:41 AM   #2
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Join Date: Dec 2015
Quote:
Originally Posted by hariskar View Post
I am not experienced with diy, but want to try this FM-Stereo-Radio
Here you can see a video of this.

The description in German is quite detailed and I know that the main difficulty is configuring L1, L2 and the trimmers. But I want to try it. I will keep you informed!
Good luck but try to put it together in pieces so that you dont get overwhelmed.
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Old 7th January 2016, 04:41 AM   #3
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Location: New Zealand
Quote:
Originally Posted by hariskar View Post
I am not experienced with diy, but want to try this FM-Stereo-Radio
Here you can see a video of this.

The description in German is quite detailed and I know that the main difficulty is configuring L1, L2 and the trimmers. But I want to try it. I will keep you informed!
Think about using a proper 9v DC supply, as the circuit will soon dissipate
the small amount of current that style of battery has - usually somewhere between
100-300ma. Voltage then drops, followed by the ability of the circuit to function.

Cheers / Chris
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Old 7th January 2016, 06:44 AM   #4
EUVL is offline EUVL  Europe
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I have build at least 5 of these :
FM/AM Tuner
https://www.elektormagazine.com/maga...r-200902/18989
https://www.elektormagazine.com/maga...r-200904/19020

Same chip set. Coil is very easy to wind.
If you have to drive londspeakers thn you just change the output chip.
See the application circuits in the TDA dataheets.

TDA 7021 T SMD: FM Radio-Circuit, SO-16 bei reichelt elektronik
TDA 7040 T SMD: Stereo Decoder, SO-8 bei reichelt elektronik
Drehkos

Great sound.


Patrick
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Old 7th January 2016, 07:05 AM   #5
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Location: Kavala
Quote:
Originally Posted by Chris Daly View Post
Think about using a proper 9v DC supply, as the circuit will soon dissipate
the small amount of current that style of battery has - usually somewhere between
100-300ma. Voltage then drops, followed by the ability of the circuit to function.

Cheers / Chris
Yes, I was thinking that too. If the rest succeeds I will do this.
EUVL, if this point to point circuit fails, I will try these PCBs.

Thank you for replies!

Last edited by hariskar; 7th January 2016 at 07:09 AM.
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Old 7th January 2016, 07:07 AM   #6
EUVL is offline EUVL  Europe
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Join Date: Oct 2003
I wish to add that :

1) There is no need to use a capcitor diode to tune, just a normal variable capacitor will do.
I even used a trimmer capacitor myself.

2) There is also no need to use a uP to indicate signal strength.
Just follow the circuit in the TDA7021 datasheet. Much simpler.

3) If you use the TDA7050 or LM386 to power speakers, you can use a single 4.8V to 6V supply (batteries or rechargeables).
For headphones also lots of choices, e.g AD8532, LM4910,......


Patrick
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Old 7th January 2016, 07:13 AM   #7
EUVL is offline EUVL  Europe
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It does not matter whether you wire P2P or use PCB.
Take time to study the dataheets and note the differences to your reference circuit.
You will see why the Elektor / Datasheet circuit is simpler.

And use proper mica or polyproplyene caps, not ceramics.
Makes hugh difference to sound quality.


Patrick
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Last edited by EUVL; 7th January 2016 at 07:16 AM.
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Old 7th January 2016, 01:52 PM   #8
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Quote:
Originally Posted by EUVL View Post
It does not matter whether you wire P2P or use PCB.
Take time to study the dataheets and note the differences to your reference circuit.
You will see why the Elektor / Datasheet circuit is simpler.

And use proper mica or polyproplyene caps, not ceramics.
Makes hugh difference to sound quality.


Patrick
I would suppose that the components of PCB would be preconfigured and almost ready to use in contrast to the p2p circuit (I am referring especially to the inductor L1).

Any good caps suggestion? There are hundreds of choices for each impedance..

Thank you
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Old 7th January 2016, 02:52 PM   #9
EUVL is offline EUVL  Europe
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That depends what you want to do.

If you want quick results then the quicket is to buy a FM stereo module from ebay.
Plenty of choice for a few Euros.

If you want to enjoy DIY then you might want to either P2P or etch your own PCB.
It is the (full) experience that counts, not the effort.

For leaded caps I use Wima MKP2 & FKP2.
Silver mica's were from Reichelt, but also available from Mouser, etc.
If you want to use SMD then Panasonic ECHU (PPS).

Inductor L1 you need to wind yourelf.
See Elektor article.


Patrick
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Old 7th January 2016, 02:59 PM   #10
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No, I do not want quick results, I even do not need a radio. I want to enjoy the DIY experience and learn. Thank you!
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