Hammond 145C 50K to 1500CT Ohm Chassis Mount Input Audio Transformer

The 145C is an input audio transformer in the 145 body of the 143-146 Series, matching a 50000 ohm primary to a 1500 ohm center-tapped secondary. It is listed for input applications fed from high impedance sources in chassis mounted audio equipment.

The 145C is rated for 50 mW output with 1 mA primary D.C. current. D.C. resistance is 2400 ohms primary and 52 ohms secondary, both +/- 15%.

Mechanically, the 145C 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 623980192901).