Hammond 148Y 5000:500 Ohm Center-Tapped PCB Output Transformer

The 148Y is an open frame output transformer with a 5000 ohm center-tapped primary and a 500 ohm center-tapped secondary. It is a fit for low-level audio designs that need to couple a high impedance stage into a 500 ohm load with center-tap access on both windings, mounted directly on a printed circuit board.

Like every unit in the 148 Series, it uses an economical, open type, horizontal bracket construction with pin-type terminals (0.25" length and 0.025" square) for P.C. board mounting. The windings are bifilar wound for balanced capacitive and resistance characteristics on pin bobbins that suit a standard 0.2" grid, and each unit is insulation tested at 250V rms. Pins are not labeled on the part; a dot marks pin 1 and the remaining pins follow the schematic figure.

The 148Y is rated for 300 mW output with a 0.7 mA maximum unbalanced primary current. D.C. resistance is 410 ohms on the primary and 52 ohms on the secondary (+/- 15%, total winding). 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 1% at 200 Hz for outputs, decreasing at higher frequencies. Pin connections follow schematic figure 5.

The series net weight is 0.6 oz. and the 148Y ships at 0.05 lbs (0.02 kg). It is RoHS and REACH compliant, UPC 623980198903.