148C

Overview

The Hammond Manufacturing 148C is an open-frame audio signal transformer designed for printed circuit board mounting. It functions as an input transformer with a single channel configuration. The device features a primary coil impedance of 50,000 ohms and secondary coil impedances of 250 ohms and 1,000 ohms. It operates within a frequency range of 200 Hz to 15 kHz. The unit utilizes pin terminal connections for through-hole termination.

Feature Summary

• Open-frame construction suitable for direct PCB integration
• Single-channel design for dedicated signal paths
• Dual secondary impedance options for flexible circuit matching

Applications

• Audio equipment input stages
• Signal conditioning circuits
• Driver interface applications

Procurement Notes

Verify the specific datasheet version to confirm exact DC resistance values and tolerance ratings. Ensure the selected variant matches the required primary-to-secondary impedance ratio for the target application. Confirm mechanical dimensions against the PCB footprint requirements before finalizing the order.

Selection Notes

Select this component when a high-impedance primary side is required for input coupling. The dual secondary options allow adaptation to varying load impedances. Verify that the operating frequency range aligns with the intended audio bandwidth. Consider thermal dissipation capabilities inherent to the open-frame design during system layout.

Part Context

This part belongs to the Hammond 148 series of audio transformers. It shares the same physical form factor and mounting style as other variants in the series, such as the 148R. Differences between models are primarily defined by their electrical impedance ratios and specific winding configurations tailored for input or driver roles.