[sdiy] Radio module

[Paul Perry]

All that coil is doing, is making a resonant circuit at the operating
frequency.
Obviously yu ave copletely the wrong coil, if it has more than two
terminals!
You probably have a RF transformer of some kind.

Personally, I'd trawl Google for simple one or two transistor FM
transmitters,
and check the coils there. Usually, they give instructions for winding your
own,
it will probably be something like 10 turns of solid wire wound on a pen or
similar. Some experimenting is necessary.

paul perry melbourne australia

----- Original Message ----- 
From: "Charles Bisaillon" <sdiy at oveloe.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, February 24, 2007 10:11 AM
Subject: [sdiy] Radio module


> I got the components on breadboard based on the design below. I added an
> opamp at the power stage with a voltage divider to get a nice 10V voltage
> source. I've also added a simple opamp with gain at the output stage.
>
> http://electronics-diy.com/TDA7000_FM_Receiver.php
>
> I've been troubleshooting the circuit for a while now but I just have no
> idea how to use the variable coil described in the schematic. Variable
coil
> L1 shows 2 ports but I have devices with 5 or 6 pins in my hands. There
are
> white caps, red caps, black and grey I think. How do we connect these,
can't
> seem to find any help on google. There is also a picture of the one they
> suggest at the bottom of the page (link).
>
> If I had more time to test, I would not ask so many questions but time is
> short, we present our system on march 27th.
>
> Thanks a lot.
>
> Charles
>
>
>
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