Signal Processing Systems : Audio Transformers : Jensen Transformers, Inc. - JT-13K7-A

Microphone Input Transformer with 0.03% Distortion Ratio and 1:5.0 Turns Ratio

Model: JT-13K7-A

Wide bandwidth -3dB at 0.9Hz and 120kHz
13.8dB voltage gain with transformer noise figure of only 1.0dB
Input impedance of 1.5kohms for loading loss under 0.9dB
High common-mode rejection 119dB at 60Hz

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Microphone input transformer with its 4.1kohms secondary source impedance, this transformer not only optimizes noise performance of many IC or discrete amplifiers but also offers excellent CMRR as well. The primary is fully balanced and its leads may be reversed to invert polarity, if required. A 30dB magnetic shield package is standard.

Wide bandwidth -3dB at 0.9Hz and 120kHz
13.8dB voltage gain with transformer noise figure of only 1.0dB
Input impedance of 1.5kohms for loading loss under 0.9dB
High common-mode rejection 119dB at 60Hz

Audio Transformer Type - Input Transformer
Spec Sheet available - Yes

Operating Temperature (Maximum): 158 F
Operating Temperature (Minimum): 32 F
Maximum Bandwidth: 120 kHz (-3dB)
Impedance Ratio: 150:3.8k
Input Impedance: 1.54 kohms (1kHz, -20dBu, test circuit 1)
Voltage Gain: 13.8 dB (1kHz, -20dBu, test circuit 1)
Deviation from linear phase (DLP): +1 ° (20Hz to 20kHz, -20dBu, test circuit 1)
Distortion (THD): 0.03 % (20Hz, -20dBu, test circuit 1)
Maximum 20Hz input level: -7.0 dBu (1% THD, test circuit 1)
Common-mode Rejection Ratio (CMRR) 150ohms Balanced Source: 119 dB (60Hz, test circuit 2)
Output Impedance: 4.14 kohms (1kHz, test circuit 1)
Primary DC resistances: 17.4 ohms
Secondary DC resistances: 471 ohms
Capacitances at 1kHz: 378 pF (secondary to shield and case)
Turns Ratio: 1:5.0
Breakdown Voltage: 250 Vrms (primary or secondary to shield and case, 60Hz, 1 minute test duration)