Jensen Transformers JT-MB-C-JENSEN Specifications

MICROPHONE BRIDGING TRANSFORMER

DUAL FARADAY SHIELDS FOR HIGH ISOLATION

M Provides additional, isolated balanced output as mic "splitter"
M Solves "transformerless" preamp problems when used as retrofit
M High common-mode rejection: 130 dB at 60 Hz
M Excellent frequency response and time domain performance
M Low insertion loss: 0.8 dB

This transformer is designed to be driven from a 150 S microphone source and
loaded by the typical 1 kS 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 30 dB magnetic shield package is standard.

JT-MB-C

TYPICAL APPLICATION

JT-MB-C SPECIFICATIONS (all levels are input unless noted)

PARAMETER CONDITIONS MINIMUM TYPICAL MAXIMUM

Input impedance, Zi 1 kHz, !20 dBu, test circuit 1 1.00 kS 1.06 kS 1.15 kS

Voltage gain 1 kHz, !20 dBu, test circuit 1 !0.90 dB !0.82 dB !0.70 dB

Magnitude response,
ref 1 kHz

Deviation from linear phase (DLP) 20 Hz to 20 kHz, !20 dBu, test circuit 1 +3.3/!0E ±5.0E

Distortion (THD)

Maximum 20 Hz input level 1% THD, test circuit 1 0 dBu +2.0 dBu

Common-mode rejection ratio (CMRR)
150 S balanced source

Common-mode rejection ratio (CMRR)
150 S unbalanced source

Output impedance, Zo 1 kHz, test circuit 1 245 S

DC resistances

Capacitances @ 1 kHz

Turns ratio 1:0.999 1:1.000 1:1.001

Temperature range operation or storage 0E C70E C

Breakdown voltage
(see IMPORTANT NOTE below)

20 Hz, !20 dBu, test circuit 1 !0.50 dB !0.14 dB ±0.0 dB

20 kHz, !20 dBu, test circuit 1 !0.25 dB !0.13 dB +0.1 dB

1 kHz, !20 dBu, test circuit 1 0.001%

20 Hz, !20 dBu, test circuit 1 0.05% 0.15%

60 Hz, test circuit 2 130 dB

3 kHz, test circuit 2 80 dB 95 dB

60 Hz, test circuit 3 115 dB

3 kHz, test circuit 3 80 dB

primary (RED to BRN) 48 S

secondary (YEL to ORG) 50 S

primary to shield and case 54 pF

secondary to shield and case 67 pF

primary or secondary to shield and case, 60 Hz,
1 minute test duration

250 V RMS

All minimum and maximum specifications are guaranteed.

without notice. All information herein is believed to be accurate and reliable, however no responsibility is assumed for its use nor for any infringements of
patents which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Jensen Transformers, Inc.

IMPORTANT NOTE

breakdown voltage specification is intended to insure integrity of internal insulation systems; continuous operation at these voltages is NOT recommended.
Consult our applications engineering department if you have special requirements.

: This device is NOT intended for use in life support systems or any application where its failure could cause injury or death. The

Unless noted otherwise, all specifications apply at 25EC. Specifications subject to change

JENSEN TRANSFORMERS, INC., 7135 Hayvenhurst Avenue, Van Nuys, CA 91406-3807, USA

9/01

[phone] • FAX [phone] • www.jensen-transformers.com