Antek Toroidal power transformer for Step-up, Measurements (part 1/2) - Page 5 - diyAudio
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Old 25th September 2012, 02:54 AM   #41
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Quote:
Originally Posted by geraldfryjr View Post
...you had stated that the Core Area of the Antek AN-0506 was about .7 square inches.
I was wondering if you could post the O.D. x I.D. x HT dimensions of the bare core in mm.
OD = 75 mm
ID = 39 mm
HT = 25mm
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Old 25th September 2012, 06:56 AM   #42
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Thanks, bolserst!!!

Much appreciated !!!!



jer
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Old 12th January 2013, 07:48 PM   #43
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Hello guys, hope you don't mind me interfering in this discussion. First post here.

I'm building a ESL for the first time and looking into transformer options, following this discussion closely. The ESL will be a wire stator. Membrane with 7500v high voltage bias supply.

I came across these toroids in my country by the company called Amplimo which produced (and possibly still produces) step up transformers for ESL:

380V transformator - Ringkerntrafo.nl

There is a PDF with specs that can be downloaded. Do you think I can use the 3 volt secondary winding to produce a step up of 1:127 with this toroid? If so, is there an alternative to connect the high voltage bias supply to instead of the missing center tap of this toroid? Or do I have to use 2 toroids per ESL for that? Furthermore, is it possible to make any assumption of the lowest frequency that will be possibly to produce with this transformer with a 2x80 watt amplifier?

I apologize for any stupid questions, I'm just a beginner and have almost no knowledge about electronics... yet
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Old 13th January 2013, 04:57 AM   #44
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Quote:
Originally Posted by jeronimo83 View Post
Do you think I can use the 3 volt secondary winding to produce a step up of 1:127 with this toroid? If so, is there an alternative to connect the high voltage bias supply to instead of the missing center tap of this toroid? Or do I have to use 2 toroids per ESL for that? Furthermore, is it possible to make any assumption of the lowest frequency that will be possibly to produce with this transformer with a 2x80 watt amplifier?
If you drove the 3 volt secondary with an 80Watt amplifier, the lowest frequency you could expect the transformer to handle without running into core saturation problems is about 450Hz.
More details here:
DIY bass transformer for ESLs ?

If you want to use a transformer that does not have a center tap on its secondary, you can create a virtual CT using two 10Mohm resistors. Acoustat used this technique in their MK-141 interface.
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Old 29th January 2013, 08:06 PM   #45
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I made myself a esl transformer for a electrical segmented esl on a large c-core. Stepup 1:125

Click the image to open in full size.
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Old 2nd February 2013, 05:38 PM   #46
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Quote:
Originally Posted by esltransformer View Post
I made myself a esl transformer for a electrical segmented esl on a large c-core. Stepup 1:125
That is a very nice response for a step-up ratio of 1:125.
Can you share how many primary turns were used and what the core size is?
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Old 3rd February 2013, 03:23 PM   #47
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Quote:
Originally Posted by bolserst View Post
That is a very nice response for a step-up ratio of 1:125.
Can you share how many primary turns were used and what the core size is?
Sure i can.
I use a c-core type: SU90B (600W/50Hz) with 54 windings primary and 6750 windings secondary.

I think impedance of a transformer is even more important then frequency response.
Here some more details from the transformer i made: impedance and saturation
Click the image to open in full size.

Click the image to open in full size.
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Old 5th February 2013, 10:27 PM   #48
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Quote:
Originally Posted by esltransformer View Post
Sure i can.
I use a c-core type: SU90B (600W/50Hz) with 54 windings primary and 6750 windings secondary...Here some more details from the transformer i made: impedance and saturation.
I believe the SU90B core area is about 13.4cm^2.

If so, saturation starting at about 15Vrms is very impressive core capability with only 54 primary turns.
This would indicate flux density of about 18,000 Gauss = 1.8 Tesla if there was no resistance in the primary circuit.

Do you know what type of metal alloy the core is made from?
Did you have any external resistor in series with the primary?
What is the resistance of the primary winding?


Thanks for sharing the results of your transformer design.
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Old 6th February 2013, 08:41 AM   #49
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Quote:
Originally Posted by bolserst View Post
I believe the SU90B core area is about 13.4cm^2.

If so, saturation starting at about 15Vrms is very impressive core capability with only 54 primary turns.
This would indicate flux density of about 18,000 Gauss = 1.8 Tesla if there was no resistance in the primary circuit.

Do you know what type of metal alloy the core is made from?
Did you have any external resistor in series with the primary?
What is the resistance of the primary winding?


Thanks for sharing the results of your transformer design.
Indeed, 13.4cm^2 and at 20Vrms the core will be at 2T (then the core is almost saturated)

The core material i use is M0 (or HiB). The primary resistance is about 0.15 Ohm and normally i use a 1 Ohm serie resistance to protect my amplifier.
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