The windings are arranged to give a high degree of symmetry if the transformer is used for phase splitting. The dual-coil structure also greatly improves immunity to external magnetic fields from e.g. power supplies and motors. Primary and secondary windings are separated by electrostatic shields.. The transformer is housed in a mu-metal can. Dimensions (L x W x H above PCB, in mm): 47 x 28 x 20Spacing between pins: 5.08 mm (0.2")Spacing between rows of pins: 35.56 mm (1.4")Rec. PCB hole diameter: 1.5 mmWeight: 83 gStatic resistance of each primary: 270 OhmStatic resistance of each secondary: 270 OhmDistortion (primaries connected in series, source impedance 600 Ohm): + 23 dBU 0.1% @ 40 Hz, + 29 dBU < 1 % @ 40 HzSelf resonance point: > 120 kHzSuggested termination for best square wave response, serial-serial connection.7k + 400pFFrequency response (serial connection , source 600 Ohm, load 20 kOhm, no terminating network 10 Hz -- 50 kHz +/- 1.0 dBFrequency response (serial connection , source 600 Ohm, load 100 kOhm in parallel with 7k + 400pF): 10 Hz -- 100 kHz +/- 1.0 dBPhase splitting balance (connection 2:1+1. Source 1kOhm, load (20kOhm? + 20kOhm) in parallel with 7k + 400pF): >46 dB, 10Hz – 50kHz Phase response (deviation from linear phase) (source 600 ohm, load 10k (Audio Precision)) 10 Hz – 20kHz, < 2°Isolation between windings/ between windings and shield: 3 kV / 1.5 kV.Suitable transformer for 1:1 applications with 600 ohm source and at least 10K reflecting impedance output 600/10K.
All reviews:
Good transformers for interconnect. LL1588/LL1592/LL1590 are good transformers for audio signal, which can be used in high-end audio system. I used these transformers for galvanic isolation and filtering like Jeff Rowland. Distortion is extremely low and Lundahl is a serious supplier for such items. Transformers are still limited to low frequencies. These three transformers support about 7Vrms at 20Hz without visible distortion on a sinusoidal signal. For the perfectionist guys, I suggest adding an RC element to have flat bandwidth and good transient response, and maybe a series capacitor as well. The question remains: mu-metal core or cobalt-based core? Mu-metal seems safer...
LL1588/LL1592/LL1590 are good transformers for audio signal, which can be used in high-end audio system. I used these transformers for galvanic isolation and filtering like Jeff Rowland. Distortion is extremely low and Lundahl is a serious supplier for such items. Transformers are still limited to low frequencies. These three transformers support about 7Vrms at 20Hz without visible distortion on a sinusoidal signal. For the perfectionist guys, I suggest adding an RC element to have flat bandwidth and good transient response, and maybe a series capacitor as well. The question remains: mu-metal core or cobalt-based core? Mu-metal seems safer...
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