Lundahl LL1540 1:2 configuration

Strawtles · Sep 1, 2020

Hello. I need a good 1:2 line input transformer, and I'd like to know if anyone has tried the Lundahl LL1540 in this configuration.
I have found the factory pdf of this transformer but it says nothing about the possibility of this connection
Thanks in advance

Heikki · Sep 1, 2020

I have used it in 1:2 configuration by connecting the two primaries parallel.

gyraf · Sep 1, 2020

+1 use it like that over here too

Strawtles · Sep 1, 2020

Was the results good?
I need this configuration to have a little signal boost

Heikki · Sep 1, 2020

With the primaries parallel and secondaries connected like the datasheet suggests the frequency response will be pretty much flat at audio frequencies, at least when driven with low source impedance. The distortion spec in the datasheet is for series connection, so if you're going to have +20 dBu signals on the primary in parallel connection the distortion will be higher.

Strawtles · Sep 1, 2020

I forgot to say I want to use it to convert a balanced signal ( primary) to unbalanced (secondary)

I don't know if this can affect the transformer operation

Whoops · Sep 3, 2020

Strawtles said:
I forgot to say I want to use it to convert a balanced signal ( primary) to unbalanced (secondary)

Pretty expensive way of doing a simple task, no?

Strawtles · Sep 6, 2020

Lundahl LL1540 1:2 configuration

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Lundahl LL1540 1:2 configuration

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