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Old 31st March 2013, 02:19 PM   #161
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Quote:
Originally Posted by esltransformer View Post
I cleaned my basement and i found some interstage transformers.
Is for a small tube Ri 6k-8kOhm, 10mA, 8-140kHz frequency response (at 7,7kOhm)
It has a HIB c-core.
Anybody interested? Just 100,- each.
I have a bigger one too, for Ecc99/6H30. 7-420kHz at 2300Ohm,25mA.
hi, esltransformer
Your interstage bifilar, I have a question:
1. what method winding - "randomly", "turn to turn," "universal" (see photo Click the image to open in full size.), "and return", or some other method? for reducing capacitance...
2. What area of the core, in square cm. ?
3. What inductance? to 5mA, 10mA, 20mA ... ? did you do the measurement ?
4. it can be used for 6S45P-E, 40 mA? What inductance? What frequency response (at 1,2 kOhm) ?
thanks.
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Old 31st March 2013, 04:28 PM   #162
TheGimp is offline TheGimp  United States
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Not esltransformer, but universal is for RF chokes and transformers. It's advantage is very low interwinding capacitance.

It is not useful for AF interstage transformers.

I have not built my transformers yet as I am building a coil winding machine first.

I plan on straight bifilar stack wound with EI-100 cores using a 1" stack (6.45 sq-cm). The prototype transformers will be on EI-85 cores with .85" stack (3.36 sq-cm). I will probably try two different winding techniques to compare, as I have two sets of EI-85 cores.
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Old 31st March 2013, 07:22 PM   #163
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Originally Posted by Vyacheslav View Post
hi, esltransformer
Your interstage bifilar, I have a question:
1. what method winding - "randomly", "turn to turn," "universal" (see photo Click the image to open in full size.), "and return", or some other method? for reducing capacitance...
2. What area of the core, in square cm. ?
3. What inductance? to 5mA, 10mA, 20mA ... ? did you do the measurement ?
4. it can be used for 6S45P-E, 40 mA? What inductance? What frequency response (at 1,2 kOhm) ?
thanks.
If you want a interstage for a 6s45 i can make a custom transformer for you.
It wil be nicely wound in layers. Low frequency response depends on your wishes.
If you are not in a hurry, in summer i will be in Ukraine so shipment can be cheaper for you.
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Old 31st March 2013, 07:39 PM   #164
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Quote:
Originally Posted by esltransformer View Post
If you want a interstage for a 6s45 i can make a custom transformer for you.
It wil be nicely wound in layers. Low frequency response depends on your wishes.
If you are not in a hurry, in summer i will be in Ukraine so shipment can be cheaper for you.
This is very interesting! When you will be in Ukraine - let me know!
thanks
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Old 31st March 2013, 07:58 PM   #165
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Originally Posted by Vyacheslav View Post
This is very interesting! When you will be in Ukraine - let me know!
thanks
You have a pm.

Btw, i like to use a large c-core so the copper losses will be lower then small cores. The core losses can be lower too if proper designed.
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Old 4th April 2013, 07:24 PM   #166
Fuling is offline Fuling  Sweden
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My winding machine (in progress), made of parts from an old Agiecut wire EDM.

Click the image to open in full size.
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Old 6th April 2013, 01:42 AM   #167
Fuling is offline Fuling  Sweden
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Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 6th April 2013, 03:22 AM   #168
TheGimp is offline TheGimp  United States
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Looks nice.

I'm working on a program to control mine using an Arduino MEGA2560 with a 4X20 display and 5 key pad ( up, dn, lt, rt, enter).

I was hoping not to re-invent the wheel, but have been unable to find source code other than ArdWinder. The ArdWinder code that is available does not seem to be complete, and looks like it hasn't been worked on in a year or more.

Last edited by TheGimp; 6th April 2013 at 03:29 AM.
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Old 7th April 2013, 12:49 AM   #169
TheGimp is offline TheGimp  United States
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Fuling, how do you plan to control your winder?
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Old 7th April 2013, 10:19 PM   #170
Fuling is offline Fuling  Sweden
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Hi,

The control/software part is still very much an open question, I hope some of my friends can help me with that part since I know next to nothing about programming. On the other hand, one week ago I knew nothing about stepper motors either so I guess everything can be learned.

Still need to find or buy a large stepper motor for the spindle and driver boards for both spindle and traverse before I can get things moving.
Right now Im working on a servo controlled wire tension system, definitely not the easiest thing to do and Im trying too keep my ambitions on a somewhat realistic level.
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