LUNDAHL
TRANSFORMERS
Tibeliusgatan 7
International
Domestic
SE-761 50 NORRTÄLJE
Phone
+46 - 176 13930
0176-13930
SWEDEN
Fax
+46 - 176 13935
0176-13935
Microphone Input Transformer
LL1936
The LL1936 is a microphone input transformer which can be connected for microphones with different
impedance. It is built using our dual coil structure, with a mu metal lamination core. The transformer is
magnetically shielded by a mu metal housing.
Turns ratio:
(
2+1) + (2+1) : 4 + 4
Dims (Length x Width x Height above PCB (mm)):
48 x 29 x 20
Pin layout
(viewed from component side)
and winding schematics:
5
•
•
18
•
9
13
•
4
•
•
17
LL1936
•
16
2
•
•
15
•
6
10
•
1
•
•
14
0.1 “
0.2 “
5
Weight:
90 g
Rec. PCB hole diameter:
1.5 mm
Secondary connection
Out+
Out-
Connect (= Output centertap)
for 1200
Ω
real or virtual
impedance
17
14
10 + 13
Input impedance
(1200 ohm load)
Turns ratio
In+ In-
Connect
Faraday
shield
and housing
75
Ω
2 : 8
5 + 6
9 + 2
15 + 18
150
Ω
3 : 8
5 + 1
4 + 2
15 + 18
300
Ω
4 : 8
5
2
9 + 6
15 + 18
600
Ω
6 : 8
5
2
4 + 1
15 + 18
Static resistance of each primary 1
(9-4 or 1-6):
13
Ω
Static resistance of each primary 2
(5-9 or 6-2):
24
Ω
Static resistance of each secondary
:
50
Ω
Distortion
Source 600
Ω
, primary connection for 600
Ω
0.1% THD @10dBU, 50Hz
1% THD @ 20dBU, 50Hz
Frequency response:
Balanced input, 0 dBU signal level, source 600
Ω
, load 10k
Ω
10Hz – 100kHz +/- 1dB rel. 1kHz
Isolation between primary and secondary windings/
between windings and shield:
4kV / 2kV
R090907
17
10
13
14
15+18 & core+can
9
2
1
4
4
4
1
6
1
2
2
0.1 “
1.3”
1.4”
