Hammond 145A 100 to 200CT Ohm Chassis Mount Driver Audio Transformer

The 145A is a driver audio transformer in the larger 145 body of the 143-146 Series, with a 100 ohm primary and a 200 ohm center-tapped secondary. It is listed for driver applications and carries the highest primary D.C. current in this group, suiting chassis mounted designs with low impedance driver stages.

The 145A is rated for 100 mW output with 45 mA primary D.C. current. D.C. resistance is 14 ohms primary and 19 ohms secondary, both +/- 15%.

Mechanically, the 145A is a small, economical open type transformer with a two hole horizontal bracket for chassis mounting and overall dimensions of A 1.63 in (41 mm), B 0.88 in (22 mm), C 0.81 in (21 mm) and D 1.38 in (35 mm). It uses insulated, color coded flexible leads at least 4" long, and net weight is 1.4 oz. Where a P.C. board mounted version of this style is needed, the manufacturer refers to the 148 and 149 series.

Frequency response is 150 Hz to 15 kHz within +/- 1 dB, referenced to 1000 Hz. The manufacturer notes that operating at impedances below nominal lowers power capability and frequency spectrum proportionately, while higher impedances raise them. It follows schematic 2 in the series table and is listed as RoHS and REACH compliant (UPC 623980192703).