Hammond Mfg. Co. Ltd., Electronics Division www.hammondmfg.com 6 5 4 108T 108T MINIATURE EPOXY POTTED AUDIO TRANSFORMER MADE IN CANADA Audio input, line matching and output transformers Epoxy potted in an attractive molded case, Pin type, P.C. board mount, (min. 0.187” length) Rugged epoxy potted construction produces a completely sealed unit withstanding severe environmental conditions. In some models where no center tap is present (on the secondary), pin 5 is omitted. Secondary may be used as primary and primary as secondary. Will withstand soldering for 10 sec. @ 260 degrees C, ambient temp. 85 degrees C max. 2 1 6 5 4 108T CANADA Power level: 150mw @ 300 Hz. to 50 Khz. -Freq. range @ +0 dbm is 300 Hz. to 50 Khz. +/- 1.5db -Freq. range @ +10 dbm is 300 Hz. to 100 Khz. +/- 1.5db -Freq. range @ +20 dbm is 300 Hz. to 100 Khz. +/- 1.5db -Freq. measurements with no D.C. saturation. 2 1 3 ELECTRICAL SPECIFICATIONS Characteristic Input Impedance Output Impedance Output Power DCR Primary 1-3 Secondary 6-8 Inductance Primary Secondary 424Ω (172Ω/252Ω) 426Ω (213Ω/213Ω) @ 1.0 kHz, 1.0 V OC 11.7 H 11.8 H Leakage Inductance 2.3 H Impedance Primary Secondary Typical 10000 ΩCT 10000 ΩCT 0.500 Watts @ 1.0 kHz, 1.0 V OC 30.9 KΩ 29.9 KΩ SCHEMATIC DIAGRAM PRIMARY 1 SECONDARY 6 Frequency Response ±1.5db from 300Hz to 50KHz Turns ratio 1:1 10000 Ω CT 2 Dielectric Strength Temperature Range 5 10000 Ω CT 500 Vrms -40 To 105°C** PCB LAYOUT 3 4 3 PRIMARY R S/ SECONDARY 2 TYPICAL TEST CIRCUIT RL R S/ OUT 2 Measurement instruments Hp4192a impedance analyzer Hp3456a DVM Keithley 2002 DVM D scope series iii audio analyzer **The epoxy that is used to cast these parts has a workable temperature range of –40°C to +105°C Under a normal rate of change, this does not include thermal shock. Variations in the transformer materials and environmental conditions may reduce the workable temperature range. 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.