Lundahl LL7101 Audio,  Zero Field Input Transformer

In a Zero Field (ZF) transformer application, the magnetic field caused by the input signal is balanced by a

feedback loop which includes the transformer's secondary winding. (See application example below). The

feedback arrangement extends the low frequency range to almost DC in spite of the small size of the

transformer.

Turns ratio: 1 + 1 : 1.38

Dims: (Length x Width x Height above PCB (mm)) 28 x 18 x 11 

Housing: Mu-metal

Core: Mu-metal

Impregnation: Solventless epoxi resin

Spacing between pins: 3.81 mm (0.15")

Spacing between rows of pins: 20.32 mm (0.8")

Rec. PCB hole diameter: 1.5 mm

Weight: 16 g

Static resistance of each primary: 138 W

Static resistance of secondary: 28 W

Isolation between windings: 2 kV

Recommended primary resistance: 10 kW -- 20 kW