FAB2306 is our Line-Level Balanced Receiver. The FAB2306 uses a THAT 1206-series InGenius balance line receiver chip.  The THAT 1206 uses bootstrapping to raise it’s common-mode input impedance into the meg-ohm range without the noise penalty of using high value resistors. They behave like transformers, able to maintain high CMRR over a wide range of source impedance imbalances, even when fed with an unbalanced signal. But unlike traditional transformers, they offer DC-coupling, low distortion and transparent sound.

The FAB2306 Line Input Module allows you to create gear that works with line-level balanced signals.  There is no need for 48V phantom power, or -20dB padding for this module unlike the FAB2010 Mic Input Module.

3D Rendering of FAB2306 Line Input Module.

For testing audio, square waves are typically used because they can reveal a lot about the system’s response with just a quick visual analysis. What’s so special about square waves? Why not use a typical “Sine Wave” or “Triangular Wave” for testing instead?

The reason is (if you remember your calculus class), the “ideal” Square Waves are composed of an infinite summation of sine waves of different frequencies. It has a single sine wave fundamental frequency, and all it’s odd harmonics. The amplitude of each odd harmonic is 1/n.   Represented by this equation: (credits: Wikipedia)

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This is similar to our FAB2110 Input Transformer Module… but instead of using a CAN type transformer, we’re using a Carnhill/UK Input Transformer, (model VTB-9045) typically used in Neve preamps.

The VTB-9045 Carnhill Transformer is a Low Level Audio Signal Transformer, with a turns ratio of 1+1:2+2.  DC Coil resistance is 24+24:130+130 ohms.

To mount the Carnhill transformer horizontally on this FAB board, a separate Carnhill PCB Adapter is also required.  Both boards will be provided when you purchase this FAB board.

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I added extra pads on the PCB so you can have easy access to the V+,GND,OUT+,OUT- signal lines on the board.  This is useful if you’ll be using our FAB2010 XLR Input Module, and FAB3010 XLR Output Module in your own project and you just want to solder your voltage and control wires directly to the board (without using the Ribbon connector or a breakout board).

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This is similar to our FAB2110 Input Transformer Module… but instead of using a CAN type transformer, we’re using a Carnhill/UK Input Transformer, typically used in Neve preamps.

To mount the Carnhill transformer horizontally on this FAB board, a separate Carnhill PCB Adapter is also required.  Both boards will be provided when you purchase this FAB board.

Continue Reading…