A joke Made in China.
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https://www.don-audio.com/TTPC-Matcher-Series-Audio-Transformer
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https://www.don-audio.com/TTPC-Matcher-Series-Audio-Transformer
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They can't spell 'dual'. They don't know what a dBu is. They are trumpeting 0.5W transformers 'designed for continuous operation' as though this was an achievement.
I have no experience of those, they must be a fairly small core size judging by the outside dimensions of the can. I have experience of the EE25 type (not screened) like this : https://www.aliexpress.com/item/32903876809.html
I'm completely inexperienced with using transformers. I see a pair of EE25 10k:10k on ebay with primary/secondary specs hand written on tape of 2.12k/1590H. Not sure I trust those specs since they're written out as having dual/center-tapped primaries, but it's obvious by the pictures that they only have 2 primary pins.
Assuming those are the specs, what's the difference between them and similar EE25 10k:10k transformers I see with much lower resistance and inductance? Would they be OK to drive a 1-2k load on each secondary from a low impedance source, or would a 600:600 be better for that?
Thanks
The inductance of a trafo is a function of a couple of parameters - the number of turns and the core material. The higher the number of turns the more volts a trafo can handle before it saturates. You can get an impression of how many turns from the DC resistance.
As a general rule of thumb I'd want the trafo's DCR to be less than 10% of the load resistance. Driving a 2k load then would be best driven from under 200R. What voltage do you need into your load? The 600ohm trafo will likely be much less capable voltage-wise than the 10k.
As a general rule of thumb I'd want the trafo's DCR to be less than 10% of the load resistance. Driving a 2k load then would be best driven from under 200R. What voltage do you need into your load? The 600ohm trafo will likely be much less capable voltage-wise than the 10k.
I need a 20Vrms differential output from a 2Vrms input. The input will be a non-inverting opamp and the outputs will be inverting opamps. I wasn't sure if it's better to use a step-up transformer or put the gain on the non-inverting opamp. I'd like to avoid gain with the output opamps if possible.
I very much doubt you'll get 20VRMS signal handling down to lower freqs with any Taobao audio trafo, that'd need a custom design. I'd be happy to advise if you want to PM me.
@matejsirk I've had good experiences with the EE25 trafos (20k:600 and 10k:10k), as far as I can tell they're audibly transparent and deliver very good value at the asking price. I should add that I've kept signal levels below 2VRMS on the 20k winding, down to 20Hz there's no problem with the FR.
It's been a long time since then. All I know is that everything went according to datasheet.
It is the best option with a low price.
It is the best option with a low price.
Can you make quality electronics with components from aliexpress ? Maybe with screws and test boards ...
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Do you think with other countries/ sites it would be better? More reliable? And why?
In my* country several well known transformer companies exist. Only one of them presents datasheets and is reliable, other companies make ???? We don’t know……
*The Netherlands
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There are certainly fakes on Aliexpress but those transformers aren't among the fakes, they do the job fine.
Since Menno van der Veen and Amplimo (= Ringkerntrafo) don't seem to work together anymore, there are now two well known transformer companies in The Netherlands that present datasheets of their transformers and are reliable (atleast in my view).
But I agree with your point (and Menno atleast has part of his transformers being manufactured in Serbia).