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Product Detailed Parameters
- Description：AUDIO TRANSFORMER, LINE INPUT, C
- Series：1140
- Mfr：Hammond Manufacturing
- Package：Bulk
- Mounting Type：Chassis Mount
- Size / Dimension：1.250" Dia (31.75mm)
- Height - Seated (Max)：1.069" (27.15mm)
- Termination Style：Wire Leads
- Turns Ratio - Primary:Secondary：4:01
- Impedance - Primary (Ohms)：42k
- Impedance - Secondary (Ohms)：225
- DC Resistance (DCR) - Primary：1.96kOhm
- DC Resistance (DCR) - Secondary：95Ohm
- Transformer Type：Impedance Matching
- Frequency Range：20Hz ~ 20kHz
- Frequency Response：-0.03dB ~ 0.07dB
- Voltage - Isolation：500V
- Insertion Loss：-
- Return Loss：-
- Power Level：+21dB
- Operating Temperature：-
- Approval Agency：-
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Overview
The Hammond Manufacturing 1140-LN-D is a studio-grade audio transformer designed for line input applications. It features chassis mounting and utilizes wire lead termination. The core material is nickel alloy, providing shielding to minimize interference. Key electrical specifications include a primary impedance of 42 kohms and a secondary impedance of 225 ohms. Primary resistance is 1.96 kohms, while secondary resistance is 95 ohms. The unit supports single-channel operation with an impedance ratio of 40K to 2.4K. Physical dimensions are 2.25 inches in length and 1.069 inches in width.
Feature Summary
- Designed for wide bandwidth and low distortion in input stages
- Matches high impedance inputs to low impedance loads
- Shielded construction using nickel alloy core material
Applications
- Audio line input stage interfacing
- High impedance to low impedance matching
- Chassis-mounted audio signal processing equipment
Procurement Notes
Verify the specific impedance configuration against circuit requirements before procurement. Confirm that the wire lead termination style aligns with the assembly design. Ensure the chassis mount form factor fits the enclosure constraints. Cross-reference the primary and secondary resistance values with system tolerance limits to guarantee signal integrity.
Selection Notes
Select this component when a dedicated line input transformer is required for studio-grade audio applications. The 42k to 225 ohm impedance profile suits specific high-impedance source matching needs. Consider the physical size and wire lead termination during PCB or panel layout planning. Evaluate the shielding requirements if electromagnetic interference is a concern in the target environment.
Part Context
This part belongs to the 1140 series of studio-grade impedance matching transformers from Hammond Manufacturing. The series includes variants such as the 1140-LU-D for line output applications. These components are engineered for professional audio environments requiring precise impedance transformation and signal fidelity.
Replacement Considerations
The 1140-LN-C is a related variant within the same series but features different impedance ratios (36K to 2.2K). Verify compatibility before substitution as the electrical characteristics differ. No other direct substitute part numbers are confirmed in public documentation.
