Transformer - Lehle, audio, Line-bridging, Unbalanced-balanced

• General purpose 1:1 line bridging audio transformer
• Transforms balanced to unbalanced line signals or unbalanced to balanced line signals
• Toroidal ring core design for a extremely low loss, strong coupling and a very low noise
• Frequency response of 3 Hz to 250 kHz - 3 dB
• CMRR of 108 dB at 50 Hz
• Input levels of up to 3.9 V RMS at 20 Hz and 9.8 V RMS at 50 Hz
• Low distortion of 0.002 % at 1 kHz / 0 dBu
• Perfect for low to mid impedance signal sources
• Electrical isolation of 2 kV between secondary and primary winding or windings and shield
• Comes in a magnetic shield can
• Completely potted to avoid microphonic issues
• Comes with leads

The LEHLE TRANSFORMER MZ is the ideal component to avoid hum loops without degrading the sound. It achieves this through galvanic isolation of low to mid impedance audio signal sources. It can be used as an input or output transformer, for balanced or unbalanced signals.

With the maximum level of 3.9 V RMS at 20 Hz and very low distortion it is perfectly suited to pro audio environments which run typically with 1.2 V RMS (+4 dBu) level. It will also work perfectly with high end audio devices for home use. In both situations the high headroom, low distortion, excellent bandwidth and strong magnetic coupling guarantee that no detail of your sound gets lost.

The toroidal core of the transformer is completely potted into the magnetically shielded enclosure, so there will be no microphonic issues. The MZ-L version with the coloured leads comes with two M3 screws, which make it very easy to mount.

Product Measurements

Turns ratio: 1:1
Input impedance: 10.2 kΩ
Output impedance: 240 Ω
Primary inductance: 158 H
Leakage inductance: 2.7 mH
Magnetic coupling: 95 dB
Voltage gain: -0.25 dB
Frequency response total range: 3 Hz - 250 kHz
Level audio range (20 Hz): -0.3 dBu
Level audio range (20 kHz): -0.2 dBu
Phase shift (20 Hz): 0.3°
Phase shift (20 kHz): -2°
Maximum input level (20Hz): 14 dBu / 3.9 VRMS
Maximum input level (50Hz): 22 dBu / 9.8 VRMS
Distortion (THD): 0.002 %
Self resonance point: 170 kHz
Common mode rejection ratio (50Hz): 108 dB
Common mode rejection ratio (1kHz): 88 dB
Primary DC resistance: 90 Ω
Secondary DC resistance: 98 Ω
Capacitance secondary winding to shield: 80 pF
Capacitance primary to secondary winding: 148 pF
Electrical isolation: 2 kV
Temperature range: -20 °C [-4 °F] - +125 °C [257 °F]
Weight: 65 g [2.3 oz]
Compliance: RoHS II according to Directive 2011/65/EU
Length: 32mm [1.26"]
Width: 32mm [1.26"]
Height: 21mm [0.83"]
Mounting Hole Center to Center: 18mm [0.71"]
Mounting Hole Threading: M3
Lead Length: 90mm [3.54"]