[minima] Re: Toroid size?
- From: Thomas Sarlandie <thomas@xxxxxxxxxxxxx>
- To: "minima@xxxxxxxxxxxxx" <minima@xxxxxxxxxxxxx>
- Date: Fri, 21 Mar 2014 15:25:41 -0700
I have only rewound the transformer, not the inductors. Mark used 32 I
think so you could look at his numbers, he usually just had one more turn
than I did. What I have discovered is that the number of turns is not as
important as the spacing between the turn and how much you spread it on the
toroid. It's pretty sensitive and you get a lot of variations (10 to 20%).
I bought the AADE LCR meter and I strongly recommend it. It's a very useful
tool for that type of project: http://www.aade.com/lcmeter.htm
At $100 in kit, this is also a fun evening project. Of course you can do
without, just spread the turns to about 75%/80% of the toroid and then use
a scope and a cheap generator to test the LPF when you are done.
thomas
thomas
On Fri, Mar 21, 2014 at 1:37 PM, hcker2000 <hcker2000@xxxxxxxxx> wrote:
> Can you post how many wraps your using of the 32awg your using for each
> toroid? I would assume it should change based on wire size.
>
>
> On Thu, Mar 20, 2014 at 11:51 PM, Thomas Sarlandie
> <thomas@xxxxxxxxxxxxx>wrote:
>
>> I started with 36 AWG but I have now found 32 AWG and it is much better.
>> 36 is too small, the wires would not even hold the toroid in place.
>>
>>
>> On Sun, Mar 16, 2014 at 6:42 AM, Jeremy Chase <jeremychase@xxxxxxxxx>wrote:
>>
>>> What gauge wire did you use? Was it the same?
>>> On Mar 16, 2014 12:50 AM, "Thomas Sarlandie" <thomas@xxxxxxxxxxxxx>
>>> wrote:
>>>
>>>> Mike,
>>>>
>>>> This is what I used, based on Mark first build. You will also need 4
>>>> ft37-43 (3 transformers + rfc).
>>>> ValueQtyCoreN-Turns (Mark)N-Turns (Thomas).33 uH2 T37-6109.39 uH2T37-611
>>>> 10.66 uH2T50-212 10.78 uH3T50-21311 3 uH3T332524
>>>> 73,
>>>> thomas
>>>>
>>>> On Fri, Mar 14, 2014 at 10:22 AM, hcker2000 <hcker2000@xxxxxxxxx>wrote:
>>>>
>>>>> Ok so I see there are ft50-43's and t50-X's I'm guessing the ft50-43's
>>>>> is what I'm after.
>>>>>
>>>>>
>>>>> On Fri, Mar 14, 2014 at 1:19 PM, Juan Carlos Berberena Glez <
>>>>> jcberberena@xxxxxxxxx> wrote:
>>>>>
>>>>>> Hi Fellow
>>>>>> Maybe it's helpful this link
>>>>>>
>>>>>> http://www.kitsandparts.com/toroids.php
>>>>>> 73's
>>>>>> Jc
>>>>>>
>>>>>>
>>>>>> 2014-03-14 13:15 GMT-04:00 hcker2000 <hcker2000@xxxxxxxxx>:
>>>>>>
>>>>>> Ok all good info. So T50's for example would they be suitable for
>>>>>>> this application (the minima)?
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Mar 14, 2014 at 1:08 PM, Joe Street <jstreet@xxxxxxxxxxxx>wrote:
>>>>>>>
>>>>>>>> Amidon has some great application notes which cover the different
>>>>>>>> materials and where their respective strengths and weaknesses lie.
>>>>>>>> It's
>>>>>>>> not as simple as which is better, it depends on the application,
>>>>>>>> frequency
>>>>>>>> range, whether or not the core has to be able to accommodate DC bias
>>>>>>>> currents which can saturate the core, etc etc. Read up on the subject
>>>>>>>> and
>>>>>>>> you will do yourself a favour and be able to design your own inductors
>>>>>>>> and
>>>>>>>> transformers.
>>>>>>>>
>>>>>>>>
>>>>>>>> On 14/03/2014 11:49 AM, hcker2000 wrote:
>>>>>>>>
>>>>>>>> Is 43 better than 61 or is it the other way around?
>>>>>>>>
>>>>>>>>
>>>>>>>> On Fri, Mar 14, 2014 at 11:48 AM, hcker2000 <hcker2000@xxxxxxxxx>wrote:
>>>>>>>>
>>>>>>>>> After looking at that I am tempted to ask "who wants to wrap and
>>>>>>>>> send me some transformers/cores".
>>>>>>>>>
>>>>>>>>> What size did the original designer use?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Fri, Mar 14, 2014 at 11:44 AM, Joe Rocci <joe@xxxxxxxxxx>wrote:
>>>>>>>>>
>>>>>>>>>> Go to this web site and download the very excellent toroid
>>>>>>>>>> calculator program. It has all the information you need to deal with
>>>>>>>>>> different types of toroids.
>>>>>>>>>>
>>>>>>>>>> http://www.dl5swb.de/html/mini_ring_core_calculator.htm
>>>>>>>>>>
>>>>>>>>>> Also, be aware that you'll need a good ferrite material for the
>>>>>>>>>> transformers (type 43 or 61 typical), and low loss powdered iron
>>>>>>>>>> cores for
>>>>>>>>>> the filters (type 2 or 6 typical).
>>>>>>>>>>
>>>>>>>>>> Joe
>>>>>>>>>> W3JDR
>>>>>>>>>>
>>>>>>>>>> ----- Original Message -----
>>>>>>>>>> *From:* hcker2000 <hcker2000@xxxxxxxxx>
>>>>>>>>>> *To:* minima@xxxxxxxxxxxxx
>>>>>>>>>> *Sent:* Friday, March 14, 2014 11:24 AM
>>>>>>>>>> *Subject:* [minima] Toroid size?
>>>>>>>>>>
>>>>>>>>>> I need to pick up some toroid's for winding. does the size
>>>>>>>>>> mater? Links to some good sizes would be greatly appreciated.
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Mike "hcker2000" Ashcraft
>>>>>>>>>> http://bigironinteractive.com
>>>>>>>>>>
>>>>>>>>>> <http://www.linkedin.com/in/mikeashcraft>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Mike "hcker2000" Ashcraft
>>>>>>>>> http://bigironinteractive.com
>>>>>>>>>
>>>>>>>>> <http://www.linkedin.com/in/mikeashcraft>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Mike "hcker2000" Ashcraft
>>>>>>>> http://bigironinteractive.com
>>>>>>>>
>>>>>>>> <http://www.linkedin.com/in/mikeashcraft>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Mike "hcker2000" Ashcraft
>>>>>>> http://bigironinteractive.com
>>>>>>>
>>>>>>> <http://www.linkedin.com/in/mikeashcraft>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> *"If you have a penny and I have a penny and we exchange pennies, you
>>>>>> still have one cent and I still have one cent. But if you have an idea
>>>>>> and
>>>>>> I have an idea and we exchange ideas, you now have two ideas and I now
>>>>>> have
>>>>>> two ideas."*
>>>>>>
>>>>>> Lic.Juan Carlos Berberena Gonzalez
>>>>>> WJ6C exCO6BG
>>>>>> www.berberena.com
>>>>>> http://espanol.groups.yahoo.com/group/cacharreando/
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Mike "hcker2000" Ashcraft
>>>>> http://bigironinteractive.com
>>>>>
>>>>> <http://www.linkedin.com/in/mikeashcraft>
>>>>>
>>>>
>>>>
>>
>
>
> --
> Mike "hcker2000" Ashcraft
> http://bigironinteractive.com
>
> <http://www.linkedin.com/in/mikeashcraft>
>
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