Lundahl LL6702 Audio transformer

LL6702 is a hybrid transformer for telephone applications. It is built using a C-core, and meets requirements for high isolation between windings. The LL6702 has an extremely low leakage inductance and thus a flat frequency response curve. This makes it easy to design the balancing network for good transhybrid loss in the entire frequency range.

Turns ratio: 1.5 , 1.5 : 1 + 1

Technical Details:

• Dims (Length x Width x Height above PCB (mm)):                                                             47 x 31 x 15

• Spacing between pins:                                                                                                          5.08 mm (0.2")

• Spacing between rows of pins:                                                                                            30.48 mm (1.2")

• Weight:                                                                                                                                 70 g

• Rec. PCB hole diameter:                                                                                                     1.5 mm

• Static resistance of each primary (pins 1-4):                                                                      9.2 ohms ?

• Static resistance of each balance (pins 2-5):                                                                       9.5 ohms??

• Leakage inductance of secondaries (sec. in series):                                                            0.3 mH

• Max. DC Current:                                                                                                                60 mA 

• Transhybrid loss (laboratory conditions):                                                                         50 dB, 10 Hz - 10 kHz

• Isolation between primary and balance windings/ between primary                              2 kV / 4 kV

          and secondary windings: