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General Purpose Transformers
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General purpose audio transformers for ground isolation, for splitting and for low turns ratio microphone input.

General properties:
• Many different connection alternatives possible
• Moderat copper resistance (50 ohms per section typically)
• Medium signal level capability (Max 10 dBU at 50 Hz per section typically)
• Excellent magnetic and electrostatic shielding
• High mu cores (mu metal or amorphous strip core)

 
     
 
Type
Turns Ratio
Size
(LxWxH mm)
Max Prim. Level.
1% dist, 50Hz
(Prim. in series)
Applications  
 
LL1527
1+1 : 1+1
38x24x17
16 dBU
The "standard" problem solver. Ground isolation, MS decoding, splitting 1 direct + 1 isolated outputs. Mic input 200:800 ohms.
 
LL1527XL
1+1 : 1+1
38x24x20.5
19 dBU
As LL1527, but with + 3 dB level capability compared to
the LL1527
 
LL1527A
1+1 : 1+1
38x24x17
16 dBU
As LL1527. Secondary shields available individually on connector pins.
 
LL1532
1+1 : 2
28x17x15
10 dBU
A small size audio transformer.For isolation, microphone input (200:800 ohms) and bridging input.
 
LL1570
1+1 : 1+1
38x24x17
16 dBU
Splitting 1 direct + 1 isolated outputs. High fidelity isolation and microphone input (200 : 800 ohms)
 
LL1570XL
1+1 : 1+1
38x24x20.5
19 dBU
As LL1570, but with + 3 dB level capability compared to
the LL1570
 
LL1581XL
1+1 : 1+1
38x24x20.5
13 dBU
(Prim in parallel)
Splitting 1 direct + 2 isolated outputs.
Very high immunity to external magnetic fields and to large ground differences.
 
LL1583
1 : 1+1
28x17x15
8 dBU
Splitting 1 direct + 2 isolated outputs.
Small size mic. level transformer with the same excellent noise immunity as the LL1581XL.
 
LL1588
1+1 : 1+1
47x28x24
+28 dBU
High level isolation applications
1:2 microphone input. Phase splitting.
 
LL1590
1:1+1+1
47x28x23
+13 dBU
Splitting1 direct + 3 isolated outputs.
 
LL1684
1+1 : 1+1
42x28x22
+25 dBU
Amorphous core version of LL1588.
High level isolation applications
1:2 microphone input. Phase splitting.
 
LL7902
1+1+1+1 : 1+1+1+1
66x32x21
28 dBU
High level high quality general purpose transformer for very demanding applications.
"When only the best is good enough".
 
LL7904
1+1: 1+1
66x32x21
+23 dBU
Very high level splitting transformer for 1 direct + 2 isolated outputs.
Very high immunity to external magnetic fields and to large ground differences.
Lundahl, General Porpuse Transformers, LL1527