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20 July 2025

LUNDAHL LL1540 TRANSFORMER Analogue audio, PCB, line input

Stock code
23-112
Brand
Lundahl (Lundahl Transformers)
Model number
  • LL1540
LUNDAHL LL1540 TRANSFORMER Analogue audio, PCB, line input
LUNDAHL LL1540 TRANSFORMER Analogue audio, PCB, line input

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/
$106.85
each (ex. VAT)
10+ $103.65
50+ $101.51
100+ $99.37
Ordered on demand, available in 2‑3 weeks. Need it sooner? Call us

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LUNDAHL ANALOGUE AUDIO TRANSFORMERS

A range of high performance PCB mounting analogue audio transformers, manufactured in Sweden. Lundahl will design variations on existing types, or completely new constructions, to meet specific needs. All housing cans are mu-metal, and pin diameters are 1.1mm, recommended PCB drill 1.5mm.

Type Turns Ratio Size LxWxH (mm) Applications Comments
LL1517 1+1,ct : 1+1 47x34x19 Line output Universal output.
LL1527 1+1 : 1+1 38x24x17 Isolation, The "standard" problem solver.
Microphone Ground isolation, MS decoding, splitting 1 direct + 1 isolated outputs.
Mic input 200:800 Ω.
LL1530 1+1 : 3.5+3.5 38x24x17 Microphone 200 : 10 k Ω. Also used in DI-boxes 10k : 200 Ω.
LL1531 1+1:2 28x17x15 Line input Small size.
LL1532 1+1 : 2 28x17x15 Isolation A small size audio transformer.
For isolation and microphone input (200:800 Ω).
LL1538 1+1 : 5 38x24x17 Microphone 200 : 5 k Ω.
LL1539 2 : 1+1 47x34x21 Line output For balanced drive.
LL1540 1+1 :1+1 38x24x17 Line input High level input.
LL1545A 1+1+1+1 : 2+2 38x24x17 Line input General purpose with many connection alternatives.
LL1570 1+1 : 1+1 38x24x17 Isolation, Splitting 1 direct + 1 isolated outputs. Extra wide bandwidth.
Microphone 200 : 200 Ω or 200 : 800 Ω.
For low impedance input mic preamps such as Jensen JE-990
LL1571 1+1 : 1.75 + 1.75 38x24x17 Microphone 200 : 2.5 k Ω.
LL1581XL 1+1 : 1+1 38x24x20.5 Splitting Splitting 1 direct + 2 isolated outputs.
Very high immunity to external magnetic fields
and to large ground differences.
LL1587 1+1 : 4 26x17x12 Microphone 200 : 3.2 k Ω. Small size.
LL1588 1+1 : 1+1 47x28x24 Isolation High level isolation applications 1:2 microphone input. Phase splitting.
LL1636 1+1+1+1 : 10+10 30x23x14.5 Microphone Mic Input. DI-box. Moving coil input.
LL2811 1+1 : 1+1 31x26x23 Line output For balanced drive. Four section windings.
Small footprint. Fits three in a row across a Euroboard.
LL5402 2 : 1+1 43x28x21 Line output For unbalanced drive
LL7401 1+1 : 1+1 47x34x17 Line output For balanced drive.
LL1528 1+1 : 2.5+2.5 38x24x17 Microphone 200 : 5 k Ω.

Full data and application notes for each type are available in the linked resources.