[time-nuts] Minicircuits 10% discount in December

[Bob Camp]

Hi

Finding the RF transformer parts is still a bit of a challenge.

Bob

> On Nov 27, 2014, at 4:21 PM, Joseph Gray <jgray at zianet.com> wrote:
> 
> Mouser carries a selection from Fair-Rite. They don't make it easy to
> find a specific part number, however.
> 
> http://www.mouser.com/Fair-Rite/Passive-Components/EMI-RFI-Components/EMI-RFI-Suppressors-Ferrites/Ferrite-Toroids-Ferrite-Rings/_/N-bw7t9?P=1z13m3cZ1yxh9di
> 
> Joe Gray
> W5JG
> 
> 
> On Thu, Nov 27, 2014 at 11:34 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
>> Again I refer you to Clifton Labs website and cross-references there to the
>> Fair-Rite part numbers/mixes. Although the marketing largely emphasizes EMI
>> suppression, all the mainline distributors now offer several mixes and core
>> styles that are perfect for RF transformers.
>> 
>> Powdered iron, yeah, those are not so easily found at mainline
>> distributors, I end up getting them from kitsandparts.com or Amidon.
>> 
>> And to Jim's point... "build your own" MMIC from discrete RF transistors
>> (often different generations of CATV-oriented transistors - you get the
>> advantage that you get tune bias currents etc. for individual need) is
>> quite easy using parts stocked at Mouser etc. They also have these
>> impressive super-beefy broadband CATV distribution/isolation amplifiers.
>> 
>> Tim N3QE
>> 
>> On Thu, Nov 27, 2014 at 12:49 PM, Bob Camp <kb8tq at n1k.org> wrote:
>> 
>>> Hi
>>> 
>>> At least last time I looked, the "easy to find" distributors had great
>>> selections of parts used for switching power supplies and EMI suppression.
>>> When you started to dig for the specialized parts for RF transformers and
>>> tuned filters, the stock was pretty thin to nonexistent. If you move from
>>> ferrite to powdered iron, the search process alway has been more
>>> difficult...
>>> 
>>> Bob
>>> 
>>>> On Nov 27, 2014, at 11:09 AM, Tim Shoppa <tshoppa at gmail.com> wrote:
>>>> 
>>>> On Thu, Nov 27, 2014 at 10:28 AM, Bob Camp <kb8tq at n1k.org> wrote:
>>>> 
>>>>> The main complaint is the difficulty of getting the correct cores. I
>>> seem
>>>>> to have a few dozen bags of cores.
>>>> 
>>>> 
>>>> The mainline distributors (Allied, Newark, Mouser, etc.)  have excellent
>>>> selection of Fair-Rite and other cores. Admittedly to a neophyte the
>>>> equivalence of Fair-Rite or Laird part numbers to an Amidon-style number
>>>> may not be evident.
>>>> 
>>>> Clifton labs has excellent webpages of examples and is also a good way to
>>>> find the cores sizes and materials commonly stocked at the mainline
>>>> distributors using the manufacturer's part number (often with cross-ref
>>> to
>>>> Amidon style number as a strong hint!)
>>>> 
>>>> Recently some here expressed concern that the mini-circuits part may
>>>> saturate with medium DC currents. Of course if you are doing a SMT
>>>> production run you don't want to use bigger cores than necessary and most
>>>> of the mini-circuits parts tend to be physically very tiny to meet this
>>>> market. But if you wind your own on bigger cores this is a non-issue.
>>>> 
>>>> Tim N3QE
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