LL1517 is an audio output transformer for balanced or unbalanced drive. The transformer is built from two three section coils, with primaries and secondaries separated by electrostatic shields, and a audio C-core of our own production. The transformer is housed in a mu-metal housing. The LL1517 has sufficient low copper resistance to meet broadcast specifications in a conventional drive configuration, but is (as all output transformers) ideally used with mixed feedback drive circuits. (See separate paper for mixed feedback design principles).
Turns ratio: 1 + 1 : 1 + 1
Dims (Length x Width x Height above PCB (mm)): 47 x 34 x 18
Spacing between pins: 5.08 mm (0.2")
Spacing between rows of pins: 35.56 mm (1.4")
Weight: 105 g
Core: Audio C-core
Housing: Mu-metal
Rec. PCB hole diameter: 1.5 mm
Static resistance of each primary: 9.2 ohms ?
Static resistance of each secondary: 9.5 ohms??
Leakage inductance of secondaries (sec. in series): 0.3 mH
No-load impedance: Typically > 600 ohms @ 50
Hz, +20 dBU
Optimum source impedance: Minus 18 ohms?
Balance of output (according to IRT, source < 10 ohms , Load 600 ohms?? ? > 60 dB
Maximum output level before saturation (sec. in series, load 600 ohms ) + 24 dBU @ 30 Hz
Distortion (achieved with mixed feedback drive circuit, load 600 ohms ) < 0.03 % @ 20 dBU, 30Hz
Frequency response (source 10 ohms ,load 600 ohms ): 10 Hz -- 80 kHz +/- 0.3 dB
Loss across transformer (at midband with 600 ? load): 0.3 dB
Isolation between primary and secondary windings / between windings and core: 4 kV / 2 kV
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