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Old 13th September 2012, 07:37 PM   #1
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Default Lundahl LL1545A hookup question...

I would like to use those two Lundahl LL1545A transfos for line in to my amplifier. Since the amplifier is not balanced, the transfo will allow me to use balanced and unbalanced.

The pdf document from Lundahl is here (only two short pages)
http://www.lundahl.se/pdfs/datash/1545a.pdf

I'll be using the following config:
R4B-R4U to L4U

Please correct me if I'm wrong...
If I take my input jacks the following pinout should apply

XLR --> Transfo R4B
1 --> 11,13,14
2 --> 9
3 --> 15

RCA --> Transfo R4U
GND --> 15 (grounded at source only)
Signal --> 9

should GND pin 11, 13, 14 from transfo input be connected to GND pin 3 from transfo output?

Is everything ok in the above?

Thanks
Do
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Last edited by pinnocchio; 13th September 2012 at 07:39 PM.
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Old 13th September 2012, 07:47 PM   #2
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Quote:
Originally Posted by pinnocchio View Post
I......
should GND pin 11, 13, 14 from transfo input be connected to GND pin 3 from transfo output?
.
......
if you need/want galvanic isolation , no ; primary side grounded at source side , secondary at load (amplifier input) side

if you don't need galvanic isolation , connect those two gnds ........ probably most convenient is to make a switch for that purpose

Quote:
Originally Posted by pinnocchio View Post
I......


Is everything ok in the above?
......
it seems as yes
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Old 13th September 2012, 07:53 PM   #3
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Weird that the negative phase (anti-phase) is connected to the same pin (15) than the RCA GND... But then the XLR GND connected to 11, 13, 14...
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