Lundahl Moving coil input transformer, LL9226XL

Lundahl Moving coil input transformer, LL9226XL

Bigger size, bigger core. LL9226 pinout.

LL9226XL is a Moving Coil Step-Up Transformer based on (and pin compatible with) our LL9226.
In the LL9226XL we have increased the core cross section about 40% to increase headroom and decrease transformer
distortion. The transformer is built up from two coils, each coil with one secondary winding surrounded by two
primary windings. This structure results in excellent frequency response and high immunity to surrounding magnetic
fields. For flexibility, all winding ends are available on the pins. As a result, LL9226XL can be used in 1:5, 1:10 and
1:20 configurations.

The LL9226XL core is our cobalt based uncut amorphous strip core. The transformer is encapsulated in a double
thickness mu metal housing.

Turns ratio: 1 + 1 + 1 + 1 : 10 + 10
Dims: (Length x Width x Height above PCB (mm)) 32 x 26 x 16

Spacing between pins: 2.54 mm (0.1")
Spacing between rows of pins: 22.86 mm (0.9")
Weight: 42 g
Rec. PCB hole diameter: 1.5 mm
Static resistance of each primary (average): 5.5 Ohm
Static resistance of each secondary (average): 145 Ohm

Frequency response
(@ -10 dBU, Connection A, source 50? , load 100 k?):

7 Hz -- 70 kHz +/- 1 dB
4 Hz -- 90 kHz +/- 1.5 dB

Distortion
(primaries connected in series, source impedance 40? ): < 0.1% @ -2 dBU, 50 Hz
Primary no load impedance @ 0 dBU, 50 Hz, all in series: 5 kOhm typically
Core / Can: Cobalt amorphous strip core / Double thickness mu metal can
Isolation between windings / between windings and core: 3 kV / 1.5 kV

Application hint: As the LL9226XL does not have Faraday shields, both sides of the transformer should have a common ground reference.

Turns ratio and suggested use at different termination alternatives.