Hammond 1140-LU-BPC +21 dBu 49% Nickel PCB Line Output Transformer

The 1140-LU-BPC is a printed circuit board mount line output transformer from the 1140-PC Series of studio grade impedance matching transformers. It is a 600:600, 1:1 design intended for line outputs on audio circuit boards.

Hammond's drawing describes bi-filar windings on a 49% nickel core, which gives low distortion levels and good output levels. The part can drive 600 Ω loads up to +21 dBu at 20 Hz. Because of the properties of the nickel core, the drive signal should have no DC component and the source impedance should be as low as possible.

Typical measured data for this part:

• THD 0.002% at 1 kHz and 0.15% at 20 Hz (4 dBu)
• Frequency response -0.20 dB at 20 Hz and +0.03 dB at 20 kHz (0 dBu)
• Common mode rejection 105 dB at 60 Hz and 70 dB at 3 kHz
• Primary and secondary DC resistance 58 Ω each at 20°C
• Capacitance 20 nF primary to shield and case, 45 pF secondary to shield and case; 250 Vrms dielectric strength

The primary connects between PIN 2 and PIN 4 and the secondary between PIN 11 and PIN 8, each 600 Ω. The 1140-LU-BPC ships at 0.2 lbs (0.09 kg), carries a Made in Canada marking on its drawing and is RoHS and REACH compliant.