FX-AUDIO- PH-A1J Power Transistor Discrete Headphone Amplifier (Silver)

This headphone amplifier features a gain adjustment and buffer circuit using independent left and right operational amplifiers in the preamplifier stage, followed by a discrete amplification circuit using power transistors. This design naturally reproduces the original sound while delivering powerful driving force.

With a maximum output of 1200mW, it maximizes the potential of your headphones.

Renewed for the second production batch: The positive and negative power supply generation has been changed from XLSEMI's XL6019 to a hybrid configuration using BD139, BD140, and TPS5430 (a high-performance DC-DC converter with a switching frequency of 500kHz), significantly reducing ripple noise.

This represents a substantial performance improvement.

【Product Features】 ・Discrete amplifier configuration using power transistors ・Preamplifier gain adjustment and buffer circuit with independent left and right operational amplifiers ・Attention to capacitor quality ・Evolved high-quality power supply circuit ・Equipped with output protection circuit using a dedicated IC ・Equipped with analog 2-input switching function

【Notes】 ・The 3.5mm stereo mini-jack input terminal is not guaranteed to work with 4-pole plugs (TRRS). • This product does not include a power supply. Please purchase an AC adapter separately.

【Product Specifications】 Color: Silver Product Warranty Period: 6 months from the date of purchase Pre-amplification/Buffer Circuit: Texas Instruments NE5532P op-amp, independent configuration for left and right channels Post-amplification Circuit: NXP Semiconductors BD139/BD140 discrete configuration Input Terminals: [LINE-IN1] 3.5mm stereo mini jack (4-pole plugs are not covered by the warranty) / [LINE-IN2] Stereo RCA terminal Output Terminal: Standard headphone jack (Φ6.3mm TRS phone jack) Output: 115mW to 1,200mW (@16Ω) Frequency Response: 10Hz to 30kHz THD+N (Total Harmonic Distortion): 0.0013% S/N Ratio: 111.3dB Supported Impedance: 16Ω to 600Ω Power Supply: DC12V, 1A or more (AC adapter sold separately) Power Connector: DC jack Outer diameter 5.5mm x Inner diameter 2.1mm (center positive) Function: Analog 2-input switching Protection circuit: Overcurrent protection function (output protection) Accessories: Simple instruction manual Size: Height 27mm x Width 73mm x Depth 128mm (excluding protrusions) Weight: 235g *Specifications and design may change without notice due to improvements, etc. Discrete amplifier configuration using power transistors Pre-stage gain adjustment & buffer circuit with left and right independent operational amplifiers Evolved high-quality power supply circuit with attention to capacitors Equipped with output protection circuit using dedicated IC, and analog 2-input switching function AC adapter required (sold separately) DC12V/1A DC jack 5.5mm x 2.1mm (center positive)