Microphone bridging transformer is designed to be driven from a 150ohms microphone source and loaded by the typical 1kohms input impedance of microphone preamplifiers. It can be used with balanced or unbalanced sources and/or loads since both primary and secondary are fully balanced. A 30dB magnetic shield package is standard.
Provides additional, isolated balanced output as mic splitter
Solves transformerless preamp problems when used as retrofit
High common-mode rejection 130dB at 60Hz
Excellent frequency response and time domain performance
Low insertion loss 0.8dB
Audio Transformer Type - Isolation Transformer
Spec Sheet available - Yes
Input Impedance:
1.08 kohms (1kHz, -20dBu, test circuit 1)
Voltage Gain:
-0.82 dB (1kHz, -20dBu, test circuit 1)
Deviation from linear phase (DLP):
+1.7/-0 ° (20Hz to 20kHz, -20dBu, test circuit 1)
Distortion (THD):
0.05 % (20Hz, -20dBu, test circuit 1)
Maximum 20Hz input level:
-2.0 dBu (1% THD, test circuit 1)
Common-mode Rejection Ratio (CMRR) 150ohms Balanced Source:
130 dB (60Hz, test circuit 2)
Common-mode Rejection Ratio (CMRR) 150ohms Unbalanced Source:
115 dB (60Hz, test circuit 3)
Output Impedance:
250 ohms (1kHz, test circuit 1)
Primary DC resistances:
50 ohms
Secondary DC resistances:
50 ohms
Capacitances at 1kHz:
87 pF (secondary to shield and case)
Turns Ratio:
1:10.0
Breakdown Voltage:
250 Vrms (primary or secondary to shield and case, 60Hz, 1 minute test duration)