Beyer Input Transformer with Phantom Power

[jodun]

Hi folks,

I have some old beyer TR145 input transformers  and I found an information sheet that states:

Quote:
"These transformers however can only be used in circuits where AC voltages are low and no DC loads are applied"
End Quote:

Does this mean that if I want to use Phantom Power, I will have to install blocking caps between my XLR inputs and the Transformer Primary.

thank you gents.

 

[mitsos]

No they should be fine.  Phantom power is applied equally to both XLR pins 2 and 3 (and therefore both ends of trafo primary) so no DC current flows through the transformer. This is why it is important to match your 6K8 resistors.