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Lundahl LL1935 Audio transformer

69,90 €
(58,74 € excl. vat)
Recommended retail price: 97,80 €
Scale price:
  • from 10: 56,92 €*
  • from 25: 52,65 €*
  • from 40: 52,32 €*
* Price per unit
Scale price:
  • from 10: 56,92 €*
  • from 25: 52,65 €*
  • from 40: 52,32 €*
* Price per unit
including 19% VAT., plus shipping
  • In stock!
  • Stock: More than 10 available
  • Shipping time: 1 - 2 workdays
Order Now
Category
Manufacturer
Item no.
  • DALL1935
Product weight
  • 0,05 kg
Shipping weight
  • 0,10 kg
Application
Compliance

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Description

The LL1935 is a transformer design for DI "Direct Input" applications, matching high impedance guitar pickups to low impedance microphone preamp inputs, but it is recommended for 1:10 microphone input applications as well. Turns ratio: 1 + 1 : 5 + 5.
The transformer consists of two coils, each with one primary and one secondary winding separated by an electrostatic shield, and a high permeability mu-metal core. The high impedance windings are wound using a special low capacitance winding technique. The transformer is encapsulated in a mu-metal case for magnetic shielding. For best performance, the high impedance side of the transformer (5 + 5) should be connected in series.

Pin layout (viewed from component side) and winding schematics:

Lundahl LL1935 diagram

Turns ratio: 1 + 1 : 5 + 5
Length: 38mm
Width: 23mm
Height above PCB:  16mm
Spacing between pins: 5.08 mm (0.2")
Spacing between rows of pins: 27.94 mm (1.1")
Offset of earth pin from adjacent row: 2.54 mm (0.1")
Weight: 46 g
Recommended PCB hole diameter: 1.5 mm
Static resistance of each primary (pins 5-6 and 7-8): 650 Ohm
Static resistance of each secondary (pins 1-2 and 3-4): 17 Ohm

Frequency response (reference 1.0 kHz)
10:1, source 100 kO , secondary open: 20 Hz ? 20 kHz +0 / -3 dB 10:1, source 100 kO, load 1 kO 10 Hz ? 45 kHz +0 / -2 dB
1:10, source 200 O, secondary open 10 Hz ? 80 kHz +/- 1dB
Distortion
For practical reasons measured in 1:10 configuration. -5 dBU input level, +14 dBU output level
< 0.1%="" thd="" @="" 50="">
Source 150O, load 10k (Audio Precision portable) +7 dBU input level, +26 dBU output level < 1%="" thd="" @="" 50="">

Self resonance point: None detected in above configurations
Isolation between windings/ between windings and shield: 4 kV / 2 kV


Recommended wiring, connection for Guitar and Bass recordings:
LL1935 DI transformer schemata wiring 10:1 connection

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Average product review: Average Rating: 5/55

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  1. Average Rating: 5/55 Joseph Petterson. Wrote at 23.09.2014
    Simple and awesome!


    thanks to don-audio for the great support. The wiring of the ll1935 was pretty simple and i am just amazed that something that simple can sound so good! It brings out all the subtle details. Playing my JSM100-VT... Wow!


Recommended accessories:

  1. Classi Laila Di Box LL1935 High-End PCB
    Classi Laila Di Box LL1935 High-End PCB
    24,92 €
    (20,94 € excl. vat)
    including 19% VAT., plus shipping
* All prices are final prices in EUR including the 19% valid value added tax/VAT.

 

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