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Please rec. step-up transformers for ESL
Please rec. step-up transformers for ESL
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Old 2nd October 2005, 11:23 AM   #21
Calvin is offline Calvin  Germany
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Default Toroids 1_40

Hi,

simple toroids
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File Type: pdf panel 2m tr toroid 1_40.pdf (64.0 KB, 135 views)
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Old 2nd October 2005, 11:24 AM   #22
Calvin is offline Calvin  Germany
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Default EI-Types 1:100

Hi,

audio EI-Types 1:100
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File Type: pdf panel 2m tr ei-type 1_100.pdf (67.3 KB, 87 views)
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Old 2nd October 2005, 01:36 PM   #23
dstockwell is offline dstockwell  United States
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The panels I am considering would be overall 6" X 48" with usable 5" X 47" so I am not conceened with operation below 200HZ or so. Would the Hammond 125E be sufficient for output trannie.
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Old 2nd October 2005, 02:20 PM   #24
Calvin is offline Calvin  Germany
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Default Hammond

Hi,

donīt think itīll work good. The 1650-Series looks better to me
I have come across the Hammond Site quite often, but I donīt think that they have the right stuff for ESLs. I miss serious data, You can work with.

jauu
Calvin
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Old 2nd October 2005, 08:51 PM   #25
BillH is offline BillH  United States
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Hehe, I was all ready to order four of these toroids and then I saw this power transformer. 120/240 volt primary and 9 volt at 2 amp secondary in a cute little package. Does cute count?

From the spec sheet:
The twin primary and secondary windings are wound on separate bobbins giving maximum isolation for enhanced safety and low capacitive coupling. The near circular shape of the transformer core results in low magnetic flux leakage.

All transformers are subjected to 4.4kV ac insulation tests and manufactured to VDE 0550 Class 2, BS415 Class 2 and Insulation classification E 120 degrees C.


Does the 'low capacitive coupling' and 'low magnetic flux leakage' give any clue that these would suffer from the same drooping high end that Calvin has seen with audio transformers?


Edit: Grammar
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Old 5th October 2005, 08:31 AM   #26
moray james is offline moray james  Canada
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Default great info! something more?

Hey Calvin: great to have the benefit of your transformer experience. Wonder if you could comment on possible step up transformers for the super tweeter project I discribed? Would it be possible to obtain response to up to 100K with ultra thin diaphragm (2 micron) and the right transformer (not custom made)? Figure 1/2 to 3/4 inch wide diaphragm and 6-8 inches tall (rough numbers) with the diaphragm split into two vertical sections and a vein (vertical) to keep one side from interacting with the other. Spacers at about 1/32 inch thick. Thanks for the assistance regards Moray James.
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Old 5th October 2005, 12:43 PM   #27
dstockwell is offline dstockwell  United States
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Looking at PP output transformers from Endcor however they only have 4 or 8 ohm taps not both, which one 4 or 8 would be best.
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Old 5th October 2005, 05:19 PM   #28
bjackson is offline bjackson  United States
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I have been following this thread for awhile, but I am a bit confused by a few things, and I hope someone can help me.

If there is a 8000 ohm to 4 ohm transformer what is the transformer ratio? Surely it's not 2000:1

What is a good source for the 220v to 9v toroid transformers I have heard of here?

And finally, if someone can answer this I'd be most grateful:

Can someone recommend a pair of transformers for a single ended amplifier that have atleast a 1:100 ratio, have decent phase and freq response, I don't need more than 15 watts of power handling (it's for headphones). Price for the pair must be less than 100 dollars, but preferably much less?
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Old 5th October 2005, 05:57 PM   #29
furly is offline furly  Canada
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question 1:
turns ratio is found by sqrt(T2/T1)
therefore sqrt(8k/4) = 1:44.7

question 2:
The source mentioned above is a good one. You won't find these toroids around any cheaper.
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Old 5th October 2005, 07:55 PM   #30
dstockwell is offline dstockwell  United States
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Can you explain or show how to wire those transformers.
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