1140-DB-A Hammond

Hammond Mfg. Co. Ltd., Electronics Division www.hammondmfg.com 1140-DB-A DIRECT BOX TRANSFORMER 12:1 TURNS RATIO WITH DUAL SHIELDS This transformer provides balanced microphone output signal from an unbalanced line level signal. This is ideal for feeding long cables with minimal high frequency losses. It also has excellent shielding from the mu metal can. ELECTRICAL SPECIFICATIONS Characteristic Conditions Typical Input Impedance 200000 1140-DB-A Output Impedance 1500 PRI:BRN - ORG: 200000 GRY: SHIELD SEC:GRN - GRN/YEL: 1500 GRY/WHT: SHIELD Primary Input 1kHz -20dbu 140K Test Circuit 3 Impedance Secondary Output CAN GROUND: VIO 1kHz -20dbu 150 Test Circuit 4 Impedance MADE IN CANADA DATE 20Hz Maximum input Level +21.0db RL = 600 DCR Primary 20 C 4.25 K 1140 - DB - A Secondary 20 C 72.0 20 Hz, -20 dbu, PRIMARY SECONDARY Frequency Response -0.07db Test Circuit 3 ORG GRN 20 kHz, -20 dbu, -0.06db Test Circuit 3 Turns ratio 11.54:1 Common Mode 60 Hz 70db Test Circuit 2 Rejection Level 200000 1500 3kHz 60db Test Circuit 2 1kHz -20 dbu THD 0.025% Test Circuit 1 20Hz -20 dbu 0.0025% BRN Test Circuit 1 GRN/YEL 20 Hz Phase Shift 2.25 Test Circuit 1 20 kHz -10.0 GRY VIO Test Circuit 1 GRY/WHT Primary to Shield and Capacitance 550pf Case Secondary to Shield 480pf and Case Dielectric Strength 500 Vrms TYPICAL TEST CIRCUIT PRIMARY SECONDARY PRIMARY SECONDARY PRIMARY SECONDARY PRIMARY SECONDARY ORG ORG GRN GRN ORG GRN ORG GRN R R S S / / 2 2 R Z S O Z R i L R V R V L L GRN/YEL GRN/YEL BRN BRN GRN/YEL GRN/YEL BRN BRN R S R S / / 2 2 GRY GRY/YEL GRY GRY/YEL GRY GRY/YEL GRY GRY/YEL VIO VIO TEST CIRCUIT 2 TEST CIRCUIT 3 TEST CIRCUIT 4 TEST CIRCUIT 1 VIO VIO Measurement instruments: Hp4192a Impedance Analyzer Hp3456a DVM Keithley 2002 DVM D scope series iii audio analyzer This drawing and the information in it is the property of Hammond Manufacturing. It may not be reproduced, transmitted or used in any manner whatsoever without the written permission of Hammond Manufacturing. Data subject to change without notice.