Hammond Mfg. Co. Ltd., Electronics Division www.hammondmfg.com 108H 6 MINIATURE EPOXY POTTED AUDIO TRANSFORMER 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. 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 50 Khz. +/- 1.5db -Freq. range @ +20 dbm is 300 Hz. to 50 Khz. +/- 1.5db -Freq. measurements with no D.C. saturation. 5 4 108H MADE IN CANADA 2 1 6 5 3 4 108H ELECTRICAL SPECIFICATIONS Characteristic Input Impedance Output Impedance Output Power DCR Primary 1-3 Secondary 4-6 Inductance Primary Secondary 50 Ω (20Ω/30Ω) 50 Ω (24Ω/26Ω) @ 1.0 kHz, 1.0 V OC 0.80 H 0.80 H Leakage Inductance 3.00 mH Impedance Primary Secondary @ 1.0 kHz, 1.0 V OC 3.90 KΩ 3.90 KΩ CANADA 1 2 3 Typical 600 ΩCT 600 ΩCT 0.500 Watts Frequency Response ±1.5db from 300Hz to 50KHz Unbalanced DC 6mA Max. Turns ratio 1:1 Dielectric Strength 100 Vrms Temperature Range -40 To 105°C** SCHEMATIC DIAGRAM PRIMARY 1 600 Ω CT 2 SECONDARY 6 5 600 Ω CT PCB LAYOUT 3 4 TYPICAL TEST CIRCUIT PRIMARY R S/ SECONDARY 2 RL Measurement instruments Hp4192a impedance analyzer Hp3456a DVM Keithley 2002 DVM D scope series iii audio analyzer R S/ OUT 2 **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.