Hammond 149E 300:30/120 Ohm Driver Transformer, 200 mW PCB Mount

The 149E is an open frame driver transformer that steps a 300 ohm primary down to a 30/120 ohm secondary for printed circuit board use. It fits low-level audio designs where a modest-impedance stage must drive a low impedance load and the part needs extra mechanical security on the board.

The 149 Series uses an economical, open type, horizontal bracket construction with pin-type terminals for P.C. board mounting, and adds clinching lugs for extra mounting strength. Windings are bifilar wound for balanced capacitive and resistance characteristics on pin bobbins spaced for a standard 0.2" grid, and the series is insulation tested at 250V rms.

The 149E is rated for 200 mW output with a maximum primary D.C. current of 42 mA. D.C. resistance is 41 ohms on the primary and 10 ohms on the secondary (+/- 15%). Frequency response is 200 Hz to 15 kHz (+/- 1 dB, referenced at 1 kHz) and insertion loss is less than 1/2 dB, while total distortion is approximately 2% at 200 Hz for drivers, decreasing at higher frequencies. The split secondary gives a choice of 30 or 120 ohms, wired per schematic figure 2.

Net weight is 1.0 oz. and the listed shipping weight is 0.05 lbs (0.02 kg). The 149E is RoHS and REACH compliant, UPC 623980199108.