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The Lundahl LL1588 is a high-level general-purpose audio transformer with a 1+1:1+1 turns ratio, designed for microphone or line input, line output and galvanic isolation. Its symmetrical winding structure, electrostatic shields and mu-metal housing support clean, high-level signal handling in demanding audio circuits.
Lundahl LL1588 High Level General Purpose Transformer 1+1:1+1
The Lundahl LL1588 is built for high-level audio signal applications where reliable isolation and flexible wiring are important. It can be used for microphone or line input, line output and galvanic isolation, making it a versatile choice for line-level interfaces in audio components and signal stages used around amplifiers.
The winding arrangement is designed for excellent symmetry, especially when the transformer is used in phase-splitting input applications. Its two-coil structure also improves immunity to external magnetic fields from nearby power supplies, motors and other interference sources. Primary and secondary windings are separated by electrostatic shields, while the high-permeability mu-metal core is enclosed in a mu-metal can.
Performance is well suited to demanding high-level audio circuits. With primaries connected in series and a 150 Ω source impedance, distortion is 0.1% at +25 dBu and below 1% at +28 dBu, measured at 50 Hz. In serial connection with a 150 Ω source and 10 kΩ load, frequency response extends from 10 Hz to 100 kHz within ±1.0 dB, with phase response deviation of ±0.5° from 20 Hz to 20 kHz.
The LL1588 is intended for PCB mounting, with dimensions of 47 x 28 x 24 mm above the PCB and a weight of 115 g. Pin spacing is 5.08 mm, row spacing is 35.56 mm and the recommended PCB hole diameter is 1.5 mm. Connection alternatives include parallel-parallel 1:1 wiring for low-loss isolation, serial-serial 1:1 wiring for high-level line isolation and phase-splitting 1:1+1 input use.
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Speakers
Amplifiers
DAC converters
DSP modules
Turntables
Streamers
Woofers
Tweeters
Exciters
Bass shakers
Plate amplifiers
Amplifier modules
Single board computers
Assembled crossovers
Printed Circuit Boards (PCB)
Capacitors
Resistors
Coils
Circuit Breakers
Crossover tools
Screw terminals
Acoustic measurements
Electric measurements
Sound level meters
DIY amplifier kits
DIY component packs
DIY speaker kit
DIY subwoofer kits
DIY bluetooth speaker
DIY electronics kits
Binding posts
Cabinet Hardware
Cables
Connectors
Speaker cabinets
Electromechanics
Power supplies
Speaker repair
Workshop & tools
Amplifier accessories
Stands & mounts
Gift voucher
Books
New products
