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Product Detailed Parameters
- Description：TRANSFORMER
- Series：148
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Through Hole
- Size / Dimension：-
- Height - Seated (Max)：0.690" (17.53mm)
- Termination Style：PC Pin
- Turns Ratio - Primary:Secondary：-
- Impedance - Primary (Ohms)：200k
- Impedance - Secondary (Ohms)：1k
- DC Resistance (DCR) - Primary：-
- DC Resistance (DCR) - Secondary：-
- Transformer Type：Economical Open Type
- Frequency Range：200Hz ~ 15kHz
- Frequency Response：±1dB
- Voltage - Isolation：250V
- Insertion Loss：0.5dB
- Return Loss：-
- Power Level：3mW
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 148D-BULK is an open-frame audio transformer designed for printed circuit board mounting. It features a step-down impedance ratio of 200,000 ohms to 1,000 ohms. The component weighs approximately 0.05 pounds (0.02 kg). This specific bulk packaging variant contains the transformer unit without additional retail accessories.
Feature Summary
- Open-frame construction suitable for direct PCB integration
- Audio signal transformation with specified impedance matching
- Through-hole mounting configuration
Applications
- Audio input stage interfacing
- Impedance matching between high-impedance sources and low-impedance loads
- Signal conditioning in professional audio equipment
Procurement Notes
Verify that the 'BULK' suffix indicates loose component packaging rather than a functional difference from standard retail versions. Confirm compatibility with your assembly process, as bulk items may lack individual protective casing. Ensure the 200K:1K ratio aligns with your circuit design requirements before finalizing the order.
Selection Notes
Select this model when a fixed 200,000-to-1,000 ohm transformation ratio is required for audio applications. Consider the open-frame design constraints regarding thermal management and physical clearance on the PCB. Evaluate if the through-hole mounting style suits your manufacturing capabilities compared to surface-mount alternatives.
Part Context
This component belongs to Hammond Manufacturing's line of audio transformers. It serves as a passive electrical interface for managing signal levels and impedance in audio circuits. The product is distinct from Hammond's enclosure or wireway products, focusing solely on electronic signal transformation.
Replacement Considerations
Direct substitutes must maintain the 200K:1K impedance ratio and open-frame PCB mount form factor. Verify pinout compatibility and frequency response characteristics against original design specifications to ensure signal integrity is preserved during replacement.
