[00940]

Hello,

I'm looking for an input transformer for a white cathode follower. The idea is to have a touch of gain in front of it as well as galvanic isolation. The wcf is used as an headphones buffer (senn hd650). I don't need much gain but unity is a bit low.

So here are the requirements :

- voltage ratio of 1:2;
- source has an output impedance of 22 (the final chipset in the dac is a tpa6120a);
- input impedance can be in between 150k and 1meg (tubes are triode strapped ecl84);
- max input level is 3vrms;
- bad thing is that there might be 5mv of dc offset at the dac output.
- price is a consideration, knowing I'm in Europe.

I've my eyes on some Gardners MU7524, would they do?

Thanks for any comments
 
 

 

[jaddie]

Don't know the Gardners products.  
 
This one works:
http://www.jensen-transformers.com/datashts/11ssp6m.pdf
 
Change R5 to 600 ohms.
 
 
Or this one:
http://cinemag.biz/line_input/PDF/CMLI-10-600B.pdf
 
Run it in reverse for a 1:4 ratio.