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Just building the IK3OIL frequency counter/vfo fll, struggling in the u.k. to find BB204 double varicap, can anyone suggest an alternative?
Many Thanks
Rob

Bought mine on ebay from China.
On Jun 30, 2013 1:55 PM, "rob_kay14758" <rob_kay14758@...> wrote:

**


Just building the IK3OIL frequency counter/vfo fll, struggling in the u.k.
to find BB204 double varicap, can anyone suggest an alternative?
Many Thanks
Rob

[Non-text portions of this message have been removed]

Replacement is the MV104 easy to find.cap 2-37pf volt 1-32v case t-92 Good luck Ron

On Sun, Jun 30, 2013 at 10:55 AM, rob_kay14758 <rob_kay14758@...>
wrote:

**
Just building the IK3OIL frequency counter/vfo fll, struggling in the
u.k. to find BB204 double varicap, can anyone suggest an alternative?Rob,

There are several listed on eBay for worldwide delivery. Here's one:



Here's another source that offers worldwide shipping.


Also, here's the datasheet for the BB204 series. It will show key
characteristics you can compare with other devices. Key characteristics
include the voltage ratio and the voltage-to-capacitance curve. You know,
now that I think of it, two single varactors (closely matched with the
right characteristics) ought to work cathode to cathode.



There's no doubt lots of other sources can be found a'Googlin'. These are
just a few.

73,

Todd
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K7TFC / Medford, Oregon, USA / CN82ni / UTC-8
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QRP (CW & SSB) / EmComm / SOTA / Homebrew / Design

--- In BITX20@..., "rob_kay14758" <rob_kay14758@...> wrote:

Just building the IK3OIL frequency counter/vfo fll, struggling in the u.k. to find BB204 double varicap, can anyone suggest an alternative?
Many Thanks
Rob

Dan's Small Parts has BB104 on sale at 20/$US8.00.

Alas, it is only for U.S. customers.

The BB104, if you can find it, is a good substitute. It is what I used in my IK3OIL fll controller. Also two of the MV1xx varicaps back-to-back will work, as suggested elsewhere.


john
AD5YE

Rob

The BB204 dual varicap is a 30 volt device. Capacitance is 14 pf with a
2.6 voltage to capacitance ratio.

<
>

The BB204B has slightly higher capacitance, 47 pf versus 39 pf, than the
BB204G.

These devices were designed for electronic tuning of FM radio
receivers. That may
give you some idea where to look for surplus and salvage units.

Arv - K7HKL
_._

The 30volt device may also be found in the old cable boxes, most of
those I tore up were 30 volt tuning. Also most were positive ground
power supplies.

Quoting arv :

Rob

The BB204 dual varicap is a 30 volt device. Capacitance is 14 pf with a
2.6 voltage to capacitance ratio.

<
>

The BB204B has slightly higher capacitance, 47 pf versus 39 pf, than the
BB204G.

These devices were designed for electronic tuning of FM radio
receivers. That may
give you some idea where to look for surplus and salvage units.

Arv - K7HKL
_._

On 06/30/2013 06:19 PM, iam74@... wrote:

--- In BITX20@... , > "rob_kay14758" wrote: > > > > Just
building the IK3OIL frequency counter/vfo fll, struggling in > the
u.k. to find BB204 double varicap, can anyone suggest an alternative?

Many Thanks > > Rob > > > > Dan's Small Parts has BB104 on sale

at 20/$US8.00. > > Alas, it is only for U.S. customers. > > The
BB104, if you can find it, is a good substitute. It is what I used >
in my IK3OIL fll controller. Also two of the MV1xx varicaps >
back-to-back will work, as suggested elsewhere. > > john > AD5YE > >
[Non-text portions of this message have been removed] Paul Daulton K5WMS beacon WMS
185.302 khz qrss30/slow 24/7 Jacksonville,Ar 72076 em34wu

[Non-text portions of this message have been removed]